Avinash Isaac Vanjare, Prashant Manohar Katke, Sameer M Padhye
Large branchiopod crustaceans are flagship species of temporary water bodies, especially in arid and semi-arid regions. Less information is available about the large branchiopods of tropical Asia compared to other parts of the world such as the Americas. To reduce this disparity, we surveyed large branchiopods from the semi-arid region of Maharashtra state, India. Sampling at 29 sites over four years revealed nine species representing four orders. This is the highest diversity ever reported from a single regional study in India. Anostracans were the most commonly occurring group, whereas the spinicaudatans Leptestheria cf. nobilisSars, 1900, L. jaisalmerensisTiwari, 1962, and Eulimnadia michaeliNayar & Nair, 1968 were very rare. Leptestheria jaisalmerensis had been known previously only from its type locality nearly 1,200 km north of our study region. Congeneric assemblages of the anostracans Streptocephalus dichotomusBaird, 1860 + S. simplexGurney, 1906 and the spinicaudatans Leptestheria cf. nobilis + L. jaisalmerensis were collected. Temporary aquatic habitats are threatened due to adverse anthropogenic activities, especially in developing countries like India. The endemic species of large branchiopods in the Indian subcontinent should be red-listed, as is done elsewhere.
{"title":"Large branchiopods (Anostraca, Notostraca, Laevicaudata, Spinicaudata) from the semi-arid regions of western India","authors":"Avinash Isaac Vanjare, Prashant Manohar Katke, Sameer M Padhye","doi":"10.1093/jcbiol/ruae050","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae050","url":null,"abstract":"Large branchiopod crustaceans are flagship species of temporary water bodies, especially in arid and semi-arid regions. Less information is available about the large branchiopods of tropical Asia compared to other parts of the world such as the Americas. To reduce this disparity, we surveyed large branchiopods from the semi-arid region of Maharashtra state, India. Sampling at 29 sites over four years revealed nine species representing four orders. This is the highest diversity ever reported from a single regional study in India. Anostracans were the most commonly occurring group, whereas the spinicaudatans Leptestheria cf. nobilisSars, 1900, L. jaisalmerensisTiwari, 1962, and Eulimnadia michaeliNayar & Nair, 1968 were very rare. Leptestheria jaisalmerensis had been known previously only from its type locality nearly 1,200 km north of our study region. Congeneric assemblages of the anostracans Streptocephalus dichotomusBaird, 1860 + S. simplexGurney, 1906 and the spinicaudatans Leptestheria cf. nobilis + L. jaisalmerensis were collected. Temporary aquatic habitats are threatened due to adverse anthropogenic activities, especially in developing countries like India. The endemic species of large branchiopods in the Indian subcontinent should be red-listed, as is done elsewhere.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142267398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The river prawn Macrobrachium vollenhovenii (Herklots, 1857) and the brackish river prawn M. macrobrachion (Herklots, 1851) are economically and ecologically significant West African species. Recent molecular studies suggest they might be different ecotypes of the same species, complicating taxonomy and sustainable aquaculture practices. Both species face significant threats from human exploitation, leading to high exploitation rates and smaller average sizes within populations. Seasonal variations affect their abundance, with M. macrobrachion more prevalent during the rainy season and M. vollenhovenii thriving in the dry season. Their omnivorous detritivorous feeding habits involve consuming detritus, diatoms, phytoplankton, and insect larvae during juvenile stages. Aquaculture of M. vollenhovenii and M. macrobrachion encounters difficulties such as limited hatchery technology and low larval survival rates. Efforts to cultivate juveniles or adults in captivity face obstacles like high mortality rates due to moulting stress, handling, feeding, and cannibalism. Reintroducing captive-bred prawns into the wild offers dual benefits: controlling snail populations that host parasite causing schistosomiasis and restoring ecological balance while enhancing local fisheries and providing socio-economic benefits. To achieve sustainable aquaculture, it is crucial to address taxonomic complexities, implement management measures to mitigate overexploitation, improve hatchery technology, optimise feeding strategies, reduce stress during moulting and handling, and engage local communities through capacity building and awareness programs. This review aims to contribute to a better understanding of these prawns, promoting informed decision-making for sustainable management, conservation, and socio-economic benefits in West Africa.
{"title":"Sustainable aquaculture of West African freshwater prawns Macrobrachium vollenhovenii (Herklots, 1857) and M. macrobrachion (Herklots, 1851) (Decapoda: Caridea: Palaemonidae)","authors":"Riyad Taguemount","doi":"10.1093/jcbiol/ruae052","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae052","url":null,"abstract":"The river prawn Macrobrachium vollenhovenii (Herklots, 1857) and the brackish river prawn M. macrobrachion (Herklots, 1851) are economically and ecologically significant West African species. Recent molecular studies suggest they might be different ecotypes of the same species, complicating taxonomy and sustainable aquaculture practices. Both species face significant threats from human exploitation, leading to high exploitation rates and smaller average sizes within populations. Seasonal variations affect their abundance, with M. macrobrachion more prevalent during the rainy season and M. vollenhovenii thriving in the dry season. Their omnivorous detritivorous feeding habits involve consuming detritus, diatoms, phytoplankton, and insect larvae during juvenile stages. Aquaculture of M. vollenhovenii and M. macrobrachion encounters difficulties such as limited hatchery technology and low larval survival rates. Efforts to cultivate juveniles or adults in captivity face obstacles like high mortality rates due to moulting stress, handling, feeding, and cannibalism. Reintroducing captive-bred prawns into the wild offers dual benefits: controlling snail populations that host parasite causing schistosomiasis and restoring ecological balance while enhancing local fisheries and providing socio-economic benefits. To achieve sustainable aquaculture, it is crucial to address taxonomic complexities, implement management measures to mitigate overexploitation, improve hatchery technology, optimise feeding strategies, reduce stress during moulting and handling, and engage local communities through capacity building and awareness programs. This review aims to contribute to a better understanding of these prawns, promoting informed decision-making for sustainable management, conservation, and socio-economic benefits in West Africa.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142267399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Only a small proportion of the world’s crustacean taxa is adapted to limno-terrestrial microhabitats that are disconnected from conventional surface waterbodies. In rare occasions, water films on terrestrial tropical and subtropical vegetation may also harbour specialised cladocerans. Bryospilus Frey, 1980 (Chydoridae) is the only genus within the class Branchiopoda that is specialised to living almost exclusively in water-saturated terrestrial moss patches, leaf litter, and phytotelms. The remarkable waterflea lineage, which has a suite of highly unusual characters within the family, has been found in terrestrial habitats in rainforests of West Africa, South and Central America, and New Zealand. We discovered a new moss-inhabiting chydorid from western India, Bryospilus (Indobryospilus) bharaticusn. sp., the first representative of the genus from the Oriental Region. Its morphology and behaviour are highly unusual for a species of Bryospilus. In comparison to its congeners, the new species can swim and it has significantly less oligomerisation, with three terminal setae on the antennal endopod instead of two and seven exopod setae on the third limb instead of six, among other features. We define a new subgenus Indobryospilusnov. and we amend the genus Bryospilus. The new species is a living evolutionary connection, characterised by a phenotype which provides us with new clues about evolutionary transitions in the only terrestrial branchiopod genus. Our results are informative beyond Cladocera, as the morphology of this species provides insights about the evolution and parallelisms of aquatic crustaceans that have specialised in limno-terrestrial habitats. We revisit the morphology of the genus, the disjunct biogeographical pattern with a potential ancient signature, and discuss the functional adaptations of these cladocerans to life on land, as well as convergences with subterranean lineages. A new key to the world species of Bryospilus species is included.
{"title":"The only terrestrial lineage in the Branchiopoda redefined: a new species of Bryospilus Frey, 1980 (Cladocera: Anomopoda) from India and adaptations of waterfleas to life on land","authors":"Kay Van Damme, Sameer M Padhye","doi":"10.1093/jcbiol/ruae054","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae054","url":null,"abstract":"Only a small proportion of the world’s crustacean taxa is adapted to limno-terrestrial microhabitats that are disconnected from conventional surface waterbodies. In rare occasions, water films on terrestrial tropical and subtropical vegetation may also harbour specialised cladocerans. Bryospilus Frey, 1980 (Chydoridae) is the only genus within the class Branchiopoda that is specialised to living almost exclusively in water-saturated terrestrial moss patches, leaf litter, and phytotelms. The remarkable waterflea lineage, which has a suite of highly unusual characters within the family, has been found in terrestrial habitats in rainforests of West Africa, South and Central America, and New Zealand. We discovered a new moss-inhabiting chydorid from western India, Bryospilus (Indobryospilus) bharaticusn. sp., the first representative of the genus from the Oriental Region. Its morphology and behaviour are highly unusual for a species of Bryospilus. In comparison to its congeners, the new species can swim and it has significantly less oligomerisation, with three terminal setae on the antennal endopod instead of two and seven exopod setae on the third limb instead of six, among other features. We define a new subgenus Indobryospilusnov. and we amend the genus Bryospilus. The new species is a living evolutionary connection, characterised by a phenotype which provides us with new clues about evolutionary transitions in the only terrestrial branchiopod genus. Our results are informative beyond Cladocera, as the morphology of this species provides insights about the evolution and parallelisms of aquatic crustaceans that have specialised in limno-terrestrial habitats. We revisit the morphology of the genus, the disjunct biogeographical pattern with a potential ancient signature, and discuss the functional adaptations of these cladocerans to life on land, as well as convergences with subterranean lineages. A new key to the world species of Bryospilus species is included.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sedigh Azizi, Reza Naderloo, Mohammad Sharif Ranjbar, Adnan Shahdadi
Understanding population dynamics requires knowledge of reproductive aspects such as sexual maturity, fertility, and growth changes of body components. We analyzed the relative growth and morphometry in a native brachyuran crab, Leptochryseus kuwaitense (Jones & Clayton, 1983), that dominates mud flats along the Iranian coast of the Persian Gulf and Gulf of Oman. The carapace (length, width, height, front), pleon (abdomen) (length and width of the first, third, fifth, and sixth segments), second, third, and fourth walking legs (total length, length, and width of the merus), cheliped propodus (length and width), and eye dimentions (distance between the two eyes and eye-stalk length), and total weight were recorded for 83 specimens. A regression model with a segmented relationship was employed to examine the relative growth patterns of the characteristics in question. The breakpoints identified in the analysis provided insights into the body size at which crabs attain sexual maturity. The carapace length of sexual morphometric maturity in males and females was 20.43 mm and 19.20 mm, respectively. Males exhibited a positive allometric growth for most traits, with adults having a greater slope than juveniles with the exception of body height, weight, and in some traits (e.g., cheliped length and width) this slope is more than double. By contrast, the growth equation for females is positive allometric for the majority of traits in juveniles, whereas were negative allometric in mature individuals. Juvenile individuals of both sexes exhibited morphological similarities, but females tended to have a smaller body size compared to males. The carapace length of the largest male was 24.2 mm (with mean of 21.71 mm, N = 43), 21.7 and (with mean of 20.14 mm, N = 40) for females, a characteristic that is likely associated with their reproductive biology. Because males are larger in body size, energy investment in the growth of walking legs and chelipeds may be crucial for mating and intreasexual cambating. The rate of growth thus exhibited a more rapid increase in males. Our results indicate that the chelipeds do not play a role in combat, but the coloration of the male cheliped plays a role in its selection by females.
{"title":"Sexually dimorphic characteristics and their functions in a native crab Leptochryseus kuwaitense (Jones & Clayton, 1983) (Decapoda: Brachyura: Camptandriidae) from the Persian Gulf","authors":"Sedigh Azizi, Reza Naderloo, Mohammad Sharif Ranjbar, Adnan Shahdadi","doi":"10.1093/jcbiol/ruae051","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae051","url":null,"abstract":"Understanding population dynamics requires knowledge of reproductive aspects such as sexual maturity, fertility, and growth changes of body components. We analyzed the relative growth and morphometry in a native brachyuran crab, Leptochryseus kuwaitense (Jones & Clayton, 1983), that dominates mud flats along the Iranian coast of the Persian Gulf and Gulf of Oman. The carapace (length, width, height, front), pleon (abdomen) (length and width of the first, third, fifth, and sixth segments), second, third, and fourth walking legs (total length, length, and width of the merus), cheliped propodus (length and width), and eye dimentions (distance between the two eyes and eye-stalk length), and total weight were recorded for 83 specimens. A regression model with a segmented relationship was employed to examine the relative growth patterns of the characteristics in question. The breakpoints identified in the analysis provided insights into the body size at which crabs attain sexual maturity. The carapace length of sexual morphometric maturity in males and females was 20.43 mm and 19.20 mm, respectively. Males exhibited a positive allometric growth for most traits, with adults having a greater slope than juveniles with the exception of body height, weight, and in some traits (e.g., cheliped length and width) this slope is more than double. By contrast, the growth equation for females is positive allometric for the majority of traits in juveniles, whereas were negative allometric in mature individuals. Juvenile individuals of both sexes exhibited morphological similarities, but females tended to have a smaller body size compared to males. The carapace length of the largest male was 24.2 mm (with mean of 21.71 mm, N = 43), 21.7 and (with mean of 20.14 mm, N = 40) for females, a characteristic that is likely associated with their reproductive biology. Because males are larger in body size, energy investment in the growth of walking legs and chelipeds may be crucial for mating and intreasexual cambating. The rate of growth thus exhibited a more rapid increase in males. Our results indicate that the chelipeds do not play a role in combat, but the coloration of the male cheliped plays a role in its selection by females.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Murtada D Naser, Amaal Gh Yasser, Patricio R De los Ríos-Escalante, Franz Essl
Invasions of non-native species have been occurring across the globe, mostly due to human activities or climate change. Although most introduced species fail to expand or have slight impact on their new ecosystems, the large number of true invasive species has led to serious economic and ecological problems. Knowledge of the fundamental drivers shaping the current distribution and abundance of invasive species of barnacles of the genus AmphibalanusPitombo, 2004 in Iraq are still poorly understood. We collected samples of barnacles from 21 sites from the lower reaches of the Shatt Al-Arab with salinities of 20–24 ppt to the upper part of the Shatt Al-Arab, and northwest to the Al-Hammar marshes and the Euphrates River with salinities of 0.9–2.8 ppt. Amphibalanus amphitrite (Darwin, 1854) was widely distributed, occurring at most sites. With the exception of a few sites close to the mouth of the Shatt Al-Arab, A. improvisus (Darwin, 1854) was restricted to sites with salinities of 22–37 ppt. Amphibalanus subalbidus (Henry, 1973) had an oligohaline distribution, occurring in moderately saline water. Redundancy analysis (RDA) revealed that the spatial distribution and abundance of all three species were influenced by salinity and temperature. Overall, our results confirm the importance of mapping the spatial distribution and abundance of invasive species in order to assess and manage the risks these species pose to native ecosystems.
{"title":"Spatial distribution and abundance of non-native barnacles of the genus Amphibalanus Pitombo, 2004 (Cirripedia: Balanidae) in southern Iraq","authors":"Murtada D Naser, Amaal Gh Yasser, Patricio R De los Ríos-Escalante, Franz Essl","doi":"10.1093/jcbiol/ruae048","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae048","url":null,"abstract":"Invasions of non-native species have been occurring across the globe, mostly due to human activities or climate change. Although most introduced species fail to expand or have slight impact on their new ecosystems, the large number of true invasive species has led to serious economic and ecological problems. Knowledge of the fundamental drivers shaping the current distribution and abundance of invasive species of barnacles of the genus AmphibalanusPitombo, 2004 in Iraq are still poorly understood. We collected samples of barnacles from 21 sites from the lower reaches of the Shatt Al-Arab with salinities of 20–24 ppt to the upper part of the Shatt Al-Arab, and northwest to the Al-Hammar marshes and the Euphrates River with salinities of 0.9–2.8 ppt. Amphibalanus amphitrite (Darwin, 1854) was widely distributed, occurring at most sites. With the exception of a few sites close to the mouth of the Shatt Al-Arab, A. improvisus (Darwin, 1854) was restricted to sites with salinities of 22–37 ppt. Amphibalanus subalbidus (Henry, 1973) had an oligohaline distribution, occurring in moderately saline water. Redundancy analysis (RDA) revealed that the spatial distribution and abundance of all three species were influenced by salinity and temperature. Overall, our results confirm the importance of mapping the spatial distribution and abundance of invasive species in order to assess and manage the risks these species pose to native ecosystems.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142227715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Decapod crustaceans and their associated fisheries are an important resource globally, and demand for seafood continues to grow alongside a growing human population. With a combined 2023 value of €36 million in Ireland, three species of brachyuran crabs, the velvet crab (Necora puberLinnaeus, 1767), edible crab (Cancer pagurusLinnaeus, 1758), spider crab (Maja squinado Herbst, 1788)), and the European lobster (Homarus gammarusLinnaeus, 1758) are decapods of commercial importance. These species are also important components of their respective ecosystems. Parasite infection can affect the health of crustaceans and may affect population productivity. Microparasites, including paramyxids (Hematodinium spp.) and microsporidians can infect decapod crustaceans and have a range of effects on their hosts. We assessed three microparasites in four crustacean species. Paramarteilia canceri was found in all three crab species, and we provide the first genetic confirmation in spider crabs. A microsporidian associated with cotton crab disease, Ameson sp., was identified in N. puber, along with a second species of microsporidian which will require further classification. None of the three parasite groups were identified in Homarus gammarus. Species of Hematodinium were not identified in any of the species studies. Our work highlights the need for parasite surveys to uncover parasite diversity and prevalence in crustaceans to help elucidate host-parasite interactions, and the potential impacts of parasites.
{"title":"Microparasite screening across four species of decapod crustaceans (Decapoda: Brachyura, Astacidea) in Ireland","authors":"Signe Martin, Deborah Cheslett, Simona Georgieva, Ian O’Connor, Fiona Swords, Katie O’Dwyer","doi":"10.1093/jcbiol/ruae029","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae029","url":null,"abstract":"Decapod crustaceans and their associated fisheries are an important resource globally, and demand for seafood continues to grow alongside a growing human population. With a combined 2023 value of €36 million in Ireland, three species of brachyuran crabs, the velvet crab (Necora puberLinnaeus, 1767), edible crab (Cancer pagurusLinnaeus, 1758), spider crab (Maja squinado Herbst, 1788)), and the European lobster (Homarus gammarusLinnaeus, 1758) are decapods of commercial importance. These species are also important components of their respective ecosystems. Parasite infection can affect the health of crustaceans and may affect population productivity. Microparasites, including paramyxids (Hematodinium spp.) and microsporidians can infect decapod crustaceans and have a range of effects on their hosts. We assessed three microparasites in four crustacean species. Paramarteilia canceri was found in all three crab species, and we provide the first genetic confirmation in spider crabs. A microsporidian associated with cotton crab disease, Ameson sp., was identified in N. puber, along with a second species of microsporidian which will require further classification. None of the three parasite groups were identified in Homarus gammarus. Species of Hematodinium were not identified in any of the species studies. Our work highlights the need for parasite surveys to uncover parasite diversity and prevalence in crustaceans to help elucidate host-parasite interactions, and the potential impacts of parasites.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cancer productus Randall, 1840 and Pugettia producta (Randall, 1840) have been observed in the field feeding on live teleost fishes, an unexpected behavior for the molluscivorous C. productus and the largely herbivorous P. producta. Crabs were seen employing a speculative hunting technique of pouncing on tufts of algae or open areas of sediment followed by probing with the pereopods. Such behaviors suggest that food web relationships involving crabs may be much more complex than usually assumed.
在野外观察到 Cancer productus Randall, 1840 和 Pugettia producta (Randall, 1840) 以活的箭鱼为食，这对于软体动物 C. productus 和草食性的 P. producta 来说是一种意想不到的行为。人们看到螃蟹采用了一种推测性的捕食技术，即扑向一簇簇藻类或沉积物的空旷区域，然后用桡足类进行探测。这些行为表明，涉及螃蟹的食物网关系可能比通常认为的要复杂得多。
{"title":"Piscivory by the crabs Cancer productus Randall, 1840 and Pugettia producta (Randall, 1840) (Decapoda: Brachyura: Cancridae, Epialtidae)","authors":"Gregory C Jensen","doi":"10.1093/jcbiol/ruae042","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae042","url":null,"abstract":"Cancer productus Randall, 1840 and Pugettia producta (Randall, 1840) have been observed in the field feeding on live teleost fishes, an unexpected behavior for the molluscivorous C. productus and the largely herbivorous P. producta. Crabs were seen employing a speculative hunting technique of pouncing on tufts of algae or open areas of sediment followed by probing with the pereopods. Such behaviors suggest that food web relationships involving crabs may be much more complex than usually assumed.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141741076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A new genus and species of lysiosquilloid mantis shrimp is described from Australia and Japan. It is unique in Stomatopoda by its unusual telson ornamentation in which the short intermediate and lateral primary teeth, accompanied by a row of short, graded serrations inward of the intermediate teeth, partially overhang a row of minute submarginal denticles. Although distinctive as a new genus and species, Incertasquilla chimeragen. et sp. nov. does not fit clearly into existing lysiosquilloid families as currently diagnosed and, in some respects, shares a mosaic of features present in several families. Incertasquilla chimeragen. et sp. nov., however, currently fits best into Tetrasquillidae, where it is tentatively placed, although further phylogenetic study may show it belongs in a separate family altogether. In the light of the new character combinations presented by the discovery of Incertasquilla chimeragen. et sp. nov., a revised diagnosis for Tetrasquillidae and updated key to the genera are provided. The discovery of Incertasquilla chimeragen. et sp. nov. expands the described lysiosquilloid fauna to 14 genera and 30 species in Australia, and 10 and 16 in Japan, respectively.
{"title":"A new genus and species of mantis shrimp from Australia and Japan (Stomatopoda: Tetrasquillidae), with a revised diagnosis of Tetrasquillidae and a key to its genera","authors":"Shane T Ahyong, Hiroki Nakajima, Tohru Naruse","doi":"10.1093/jcbiol/ruae038","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae038","url":null,"abstract":"A new genus and species of lysiosquilloid mantis shrimp is described from Australia and Japan. It is unique in Stomatopoda by its unusual telson ornamentation in which the short intermediate and lateral primary teeth, accompanied by a row of short, graded serrations inward of the intermediate teeth, partially overhang a row of minute submarginal denticles. Although distinctive as a new genus and species, Incertasquilla chimeragen. et sp. nov. does not fit clearly into existing lysiosquilloid families as currently diagnosed and, in some respects, shares a mosaic of features present in several families. Incertasquilla chimeragen. et sp. nov., however, currently fits best into Tetrasquillidae, where it is tentatively placed, although further phylogenetic study may show it belongs in a separate family altogether. In the light of the new character combinations presented by the discovery of Incertasquilla chimeragen. et sp. nov., a revised diagnosis for Tetrasquillidae and updated key to the genera are provided. The discovery of Incertasquilla chimeragen. et sp. nov. expands the described lysiosquilloid fauna to 14 genera and 30 species in Australia, and 10 and 16 in Japan, respectively.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tina Thesslund, Astrid C Wittmann, Gerrit Timmerhaus, Ragnhild S Berg, Marianne H S Hansen, Sten Siikavuopio, Tor H Evensen, Øivind Andersen
Ectothermic marine animals vary widely in their tolerance to temperature changes, and polar stenothermal species seem to have poor ability to compensate for a rise in water temperature. The sub-Arctic snow crab (Chionoecetes opilioFabricius, 1788) lives in the northwestern Atlantic Ocean and northern Pacific Ocean at temperatures ranging from about −1.5 °C to 4 °C. Since the metabolic costs overtake caloric intake above 7 °C, the snow crab appears to be energetically restricted to cold water. We investigated thermal stress responses in adult male crabs exposed to a sudden temperature increase to 9.5 °C for 24 hr after four weeks of acclimation at 2.5 °C or 5.5 °C. Heart-rate loggers implanted in a limited number of crabs showed 60% increase in cardiac activity during the thermal stress. Surplus oxygen supply in all crabs was inferred by the low hemolymph lactate and unchanged glucose levels, but only the crabs acclimated at 5.5 °C were still active at the elevated temperature. Low heat shock and oxidative stress responses were suggested by the missing upregulation of the genes encoding four heat shock proteins (Hsp70a, Hsc71, Hsp90a2, Hsp60) and the antioxidative enzymes superoxide dismutase and catalase. The trend towards inverse temperature-dependent on the expression of the hsp genes may be related to increased protein damage at low temperatures, or possible trade-offs between costs and benefits of producing heat shock proteins at elevated temperature. Although adult snow crabs seem to be able to cope with short-term heat stress, the tolerance to chronic elevated temperatures should be further examined using a larger number of individuals.
{"title":"Temperature acclimation and response to acute thermal stress in the adults of the snow crab Chionoecetes opilio Fabricius, 1788 (Decapoda: Brachyura: Oregoniidae)","authors":"Tina Thesslund, Astrid C Wittmann, Gerrit Timmerhaus, Ragnhild S Berg, Marianne H S Hansen, Sten Siikavuopio, Tor H Evensen, Øivind Andersen","doi":"10.1093/jcbiol/ruae040","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae040","url":null,"abstract":"Ectothermic marine animals vary widely in their tolerance to temperature changes, and polar stenothermal species seem to have poor ability to compensate for a rise in water temperature. The sub-Arctic snow crab (Chionoecetes opilioFabricius, 1788) lives in the northwestern Atlantic Ocean and northern Pacific Ocean at temperatures ranging from about −1.5 °C to 4 °C. Since the metabolic costs overtake caloric intake above 7 °C, the snow crab appears to be energetically restricted to cold water. We investigated thermal stress responses in adult male crabs exposed to a sudden temperature increase to 9.5 °C for 24 hr after four weeks of acclimation at 2.5 °C or 5.5 °C. Heart-rate loggers implanted in a limited number of crabs showed 60% increase in cardiac activity during the thermal stress. Surplus oxygen supply in all crabs was inferred by the low hemolymph lactate and unchanged glucose levels, but only the crabs acclimated at 5.5 °C were still active at the elevated temperature. Low heat shock and oxidative stress responses were suggested by the missing upregulation of the genes encoding four heat shock proteins (Hsp70a, Hsc71, Hsp90a2, Hsp60) and the antioxidative enzymes superoxide dismutase and catalase. The trend towards inverse temperature-dependent on the expression of the hsp genes may be related to increased protein damage at low temperatures, or possible trade-offs between costs and benefits of producing heat shock proteins at elevated temperature. Although adult snow crabs seem to be able to cope with short-term heat stress, the tolerance to chronic elevated temperatures should be further examined using a larger number of individuals.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The corystid Gomeza serrata Dana, 1852, described from Patagonia in South America has rarely been reported and its taxonomy is poorly understood. While superficially similar to G. bicornisGray, 1831 from the Indo-West Pacific and the type species of Gomeza Gray, 1931, direct comparisons have not been recorded. Examination of topotypic specimens show that Gomeza serrata is actually a juvenile of Peltarion spinosulus (White, 1843), a member of the family Trichopeltariidae. A neotype is selected for G. serrata to stabilize its taxonomy.
{"title":"Gomeza serrata Dana, 1852 is a trichopeltariid, not a corystid, and a junior synonym of Peltarion spinosulus (White, 1843) (Decapoda: Brachyura: Trichopeltarioidea)","authors":"Peter K L Ng, Marcos Tavares","doi":"10.1093/jcbiol/ruae037","DOIUrl":"https://doi.org/10.1093/jcbiol/ruae037","url":null,"abstract":"The corystid Gomeza serrata Dana, 1852, described from Patagonia in South America has rarely been reported and its taxonomy is poorly understood. While superficially similar to G. bicornisGray, 1831 from the Indo-West Pacific and the type species of Gomeza Gray, 1931, direct comparisons have not been recorded. Examination of topotypic specimens show that Gomeza serrata is actually a juvenile of Peltarion spinosulus (White, 1843), a member of the family Trichopeltariidae. A neotype is selected for G. serrata to stabilize its taxonomy.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141573390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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