Kirti Ramesh, Linda Svanberg, Isabel Casties, Susanne Eriksson, Sam Dupont
Abstract Occurrence of developmental malformations is of interest since they potentially influence organismal performance and fitness. We report an increased incidence (⁓ 46 fold) of physical malformations in the larvae of the American lobster Homarus Gammarus (Linnaeus, 1758) in response to seawater acidification (–0.58 pH units relative to nominal pH 8.0). We observed three malformations under the influence of seawater acidification previously undescribed in lobster larvae: a flared carapace, twisted tail, and cross claw. Larvae reared under seawater acidification exhibit significantly lower survivorship (by ⁓14%) and the occurrence of a malformation decreases survivorship (12.7%). Larvae with four types of malformations did not progress through development to reach post-larval stages. Namely, these malformations were a flared carapace, curled carapace, twisted tail, and cross claw. Results from this study provide photographic documentation of various lobster larval malformations that ultimately affect individual success and can be applied for quality-control in hatcheries.
{"title":"Photographic characterisation of acidification-induced larval malformations in the European lobster <i>Homarus gammarus</i> (Linnaeus, 1758) (Decapoda: Astacidea: Nephropidae)","authors":"Kirti Ramesh, Linda Svanberg, Isabel Casties, Susanne Eriksson, Sam Dupont","doi":"10.1093/jcbiol/ruad066","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad066","url":null,"abstract":"Abstract Occurrence of developmental malformations is of interest since they potentially influence organismal performance and fitness. We report an increased incidence (⁓ 46 fold) of physical malformations in the larvae of the American lobster Homarus Gammarus (Linnaeus, 1758) in response to seawater acidification (–0.58 pH units relative to nominal pH 8.0). We observed three malformations under the influence of seawater acidification previously undescribed in lobster larvae: a flared carapace, twisted tail, and cross claw. Larvae reared under seawater acidification exhibit significantly lower survivorship (by ⁓14%) and the occurrence of a malformation decreases survivorship (12.7%). Larvae with four types of malformations did not progress through development to reach post-larval stages. Namely, these malformations were a flared carapace, curled carapace, twisted tail, and cross claw. Results from this study provide photographic documentation of various lobster larval malformations that ultimately affect individual success and can be applied for quality-control in hatcheries.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"5 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135086968","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}
Abstract Little is known about chemical sensing during settlement by pueruli of the Caribbean spiny lobster Panulirus argus Latreille, 1804 and the effect that Panulirus argus virus 1 (PaV1), the first pathogenic virus to infect any spiny lobster, has on settling pueruli. Considering that the avoidance of PaV1-infected lobsters by early-benthic juveniles is well documented and the previously reported costs of close proximity to PaV1-infected early-benthic juveniles (increased mortality risk), pueruli of P. argus should avoid infected conspecifics during settlement. We experimentally tested if pueruli show aversion to PaV1-infected conspecifics. We also re-tested the previously reported effect of red algae (Laurencia spp.) and healthy conspecifics on pueruli settlement decisions. Considering the known benefits of inhabiting red algae and costs of close proximity to conspecific juveniles, pueruli were predicted to be attracted to metabolites produced by red algae and repulsed by metabolites produced by conspecifics. We also predicted that attraction to red algae would decrease or cease if this cue was presented together with cues produced by PaV1-infected conspecifics. Our experiments indicate that pueruli do not avoid metabolites produced by benthic juveniles and are not attracted to metabolites produced by red algae. Importantly, pueruli are attracted to a combination of metabolites produced by red algae and conspecific juveniles but this attraction ceases if conspecifics are PaV1-infected. Our results indicate that PaV1 disrupts habitat selection by settling pueruli and suggest that assumptions about cost and benefits experienced by settling pueruli need to be revisited. Research to improve the understanding of the relationship between recruitment, disease avoidance, and fishery stock in this heavily exploited spiny lobster is needed.
{"title":"Chemical sensing and avoidance of PaV1-infected conspecifics by pueruli post-larvae of the reef-dwelling Caribbean spiny lobster <i>Panulirus argus</i> Latreille, 1804 (Decapoda: Achelata: Palinuridae)","authors":"Louis J Ambrosio, J Antonio Baeza","doi":"10.1093/jcbiol/ruad065","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad065","url":null,"abstract":"Abstract Little is known about chemical sensing during settlement by pueruli of the Caribbean spiny lobster Panulirus argus Latreille, 1804 and the effect that Panulirus argus virus 1 (PaV1), the first pathogenic virus to infect any spiny lobster, has on settling pueruli. Considering that the avoidance of PaV1-infected lobsters by early-benthic juveniles is well documented and the previously reported costs of close proximity to PaV1-infected early-benthic juveniles (increased mortality risk), pueruli of P. argus should avoid infected conspecifics during settlement. We experimentally tested if pueruli show aversion to PaV1-infected conspecifics. We also re-tested the previously reported effect of red algae (Laurencia spp.) and healthy conspecifics on pueruli settlement decisions. Considering the known benefits of inhabiting red algae and costs of close proximity to conspecific juveniles, pueruli were predicted to be attracted to metabolites produced by red algae and repulsed by metabolites produced by conspecifics. We also predicted that attraction to red algae would decrease or cease if this cue was presented together with cues produced by PaV1-infected conspecifics. Our experiments indicate that pueruli do not avoid metabolites produced by benthic juveniles and are not attracted to metabolites produced by red algae. Importantly, pueruli are attracted to a combination of metabolites produced by red algae and conspecific juveniles but this attraction ceases if conspecifics are PaV1-infected. Our results indicate that PaV1 disrupts habitat selection by settling pueruli and suggest that assumptions about cost and benefits experienced by settling pueruli need to be revisited. Research to improve the understanding of the relationship between recruitment, disease avoidance, and fishery stock in this heavily exploited spiny lobster is needed.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"124 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135540538","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}
Abstract Current knowledge of age at legal size in Newfoundland & Labrador (NL) and other snow-crab stocks is incomplete due to historic estimations not accounting for skip-molting growth delays. Previous work has shown skip-molting incidence to occasionally be very high in males, both in NL and some other major snow-crab stocks. This warrants research to better understand impacts of skip-molting on snow-crab age and growth dynamics, which are central to population assessment and resource management. We simulated the impact of skip-molting on growth dynamics of snow crabs from three regions around NL by coupling a nineteen year time series of molt-type probabilities derived from field trawl surveys to historical data on age-at-instar based on cohort analysis of wild populations that do not consider skip-molting in making age estimations. Trawl surveys and simulations showed that skip-molting is a prominent feature in NL snow crabs, with up to four skip-molts being a reasonable maximum possible estimate for males in portions of the NL snow-crab stock. A complementary analysis examining the ability to age snow crabs using gastric mill band counts showed overall strong agreement with published growth trajectories that were modified to include skip-molting as well as reasonable average age approximations for most crabs, but unexpectedly high variability in age estimates for individuals of a same instar stage and unexpectedly low age estimates for younger crabs. Our study leads to a refinement of age at legal size for NL snow crab from the current nine-year estimate to a range of 9–13 years. Although this range is deemed to capture virtually every crab reaching legal size in NL snow-crab populations, ages higher than 11 years to fishery recruitment (2 skip-molts) are relatively infrequent.
{"title":"Refining age at legal-size estimation in the Newfoundland & Labrador populations of the snow crab <i>Chionoecetes opilio</i> (Fabricius, 1788) (Decapoda: Brachyura: Oregoniidae)","authors":"Darrell Mullowney, Nicole O’Connell, Raouf Kilada, Rémy Rochette","doi":"10.1093/jcbiol/ruad067","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad067","url":null,"abstract":"Abstract Current knowledge of age at legal size in Newfoundland & Labrador (NL) and other snow-crab stocks is incomplete due to historic estimations not accounting for skip-molting growth delays. Previous work has shown skip-molting incidence to occasionally be very high in males, both in NL and some other major snow-crab stocks. This warrants research to better understand impacts of skip-molting on snow-crab age and growth dynamics, which are central to population assessment and resource management. We simulated the impact of skip-molting on growth dynamics of snow crabs from three regions around NL by coupling a nineteen year time series of molt-type probabilities derived from field trawl surveys to historical data on age-at-instar based on cohort analysis of wild populations that do not consider skip-molting in making age estimations. Trawl surveys and simulations showed that skip-molting is a prominent feature in NL snow crabs, with up to four skip-molts being a reasonable maximum possible estimate for males in portions of the NL snow-crab stock. A complementary analysis examining the ability to age snow crabs using gastric mill band counts showed overall strong agreement with published growth trajectories that were modified to include skip-molting as well as reasonable average age approximations for most crabs, but unexpectedly high variability in age estimates for individuals of a same instar stage and unexpectedly low age estimates for younger crabs. Our study leads to a refinement of age at legal size for NL snow crab from the current nine-year estimate to a range of 9–13 years. Although this range is deemed to capture virtually every crab reaching legal size in NL snow-crab populations, ages higher than 11 years to fishery recruitment (2 skip-molts) are relatively infrequent.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"53 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775857","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}
Abstract The name Penaeus simplex, given to a new species of prawn species by Tin-Yam Chan, Zainal Abidin Muchlisin, and Amirah Hurzaid (2021) in an article published in Journal of Crustacean Biology (https://doi.org/10.1093/jcbiol/ruaa096) is deemed to be unavailable according to the International Code of Zoological Nomenclature (Code) because that article is an electronic-only publication and did not include a ZooBank registration number (LSID). The present note serves to validate the name Penaeus simplex by fulfilling the requirements of the Code.
{"title":"Validation of <i>Penaeus simplex</i> (Decapoda: Dendrobranchiata: Penaeidae), a commercially important prawn from Indonesia","authors":"Tin-Yam Chan, Zainal Abidin Muchlisin, Amirah Hurzaid","doi":"10.1093/jcbiol/ruad064","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad064","url":null,"abstract":"Abstract The name Penaeus simplex, given to a new species of prawn species by Tin-Yam Chan, Zainal Abidin Muchlisin, and Amirah Hurzaid (2021) in an article published in Journal of Crustacean Biology (https://doi.org/10.1093/jcbiol/ruaa096) is deemed to be unavailable according to the International Code of Zoological Nomenclature (Code) because that article is an electronic-only publication and did not include a ZooBank registration number (LSID). The present note serves to validate the name Penaeus simplex by fulfilling the requirements of the Code.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"52 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775859","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}
Quang-Tuong Luong, Rika Shiraishi, Tadashi Kawai, Koki R Katsuhara, Kazuyoshi Nakata
Abstract The red swamp crayfish Procambarus clarkii (Girard, 1852) has been responsible for negative impacts on native benthic fauna and flora in invaded freshwater ecosystems around the world, including Japan. We need to clarify the reproductive biology in the invaded habitats as basic information to effectively control the introduced populations, but the reproductive biology of P. clarkii in Japan (especially in western Japan) has not been well studied. We conducted monthly samplings of P. clarkii from November 2015 to November 2016 in a pond (which does not freeze, even in winter) in Okayama, western Japan, both by using shrimp cage traps and by hand nets to examine aspects of the reproduction, including a form alternation (i.e., Form I and II). We also reared spawning females in the laboratory and calculated the accumulated water temperature during the period to Stage-3 juveniles after spawning. The total number of individuals caught throughout the study period was 6,319 (2,601 males and 2,777 females, with eight of unknown sex and 933 juveniles). The males were all Form I with a breeding status from September to November 2016. We first found ovigerous females in July 2016 and females carrying hatchlings in October 2016, even in January 2016. The form alternation in males was confirmed not only in the cheliped length, but in the hook length. In laboratory observations, approximately 52 days with approximately 1,222 °C degree-days of the accumulated water temperature were necessary to Stage-3 juveniles after spawning. Our results indicate that P. clarkii can reproduce within approximately five months of hatching.
{"title":"Reproductive biology of the introduced red-swamp crayfish <i>Procambarus clarkii</i> (Girard, 1852) (Decapoda: Astacidea: Cambaridae) in western Japan","authors":"Quang-Tuong Luong, Rika Shiraishi, Tadashi Kawai, Koki R Katsuhara, Kazuyoshi Nakata","doi":"10.1093/jcbiol/ruad063","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad063","url":null,"abstract":"Abstract The red swamp crayfish Procambarus clarkii (Girard, 1852) has been responsible for negative impacts on native benthic fauna and flora in invaded freshwater ecosystems around the world, including Japan. We need to clarify the reproductive biology in the invaded habitats as basic information to effectively control the introduced populations, but the reproductive biology of P. clarkii in Japan (especially in western Japan) has not been well studied. We conducted monthly samplings of P. clarkii from November 2015 to November 2016 in a pond (which does not freeze, even in winter) in Okayama, western Japan, both by using shrimp cage traps and by hand nets to examine aspects of the reproduction, including a form alternation (i.e., Form I and II). We also reared spawning females in the laboratory and calculated the accumulated water temperature during the period to Stage-3 juveniles after spawning. The total number of individuals caught throughout the study period was 6,319 (2,601 males and 2,777 females, with eight of unknown sex and 933 juveniles). The males were all Form I with a breeding status from September to November 2016. We first found ovigerous females in July 2016 and females carrying hatchlings in October 2016, even in January 2016. The form alternation in males was confirmed not only in the cheliped length, but in the hook length. In laboratory observations, approximately 52 days with approximately 1,222 °C degree-days of the accumulated water temperature were necessary to Stage-3 juveniles after spawning. Our results indicate that P. clarkii can reproduce within approximately five months of hatching.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"48 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135976844","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}
Martina Kočová Veselská, Tadashi Kawai, Denis Audo
Abstract Two species of fossil crustaceans from the Czech Republic are assigned to AstacusFabricius, 1775, a European crayfish: A. laevissimusFritsch & Kafka, 1887 and A. cenomanensisFritsch & Kafka, 1887. Both come from marine sediments, making doubtful their assignment to crayfishes. Specimens assigned to Astacus laevissimus correspond in fact to propodi of etyoid brachyurans. The type material of A. cenomanensis is heterogeneous, comprising fragmentary ctenochelid (Thalassinidea) propodi and isolated cheliped fingers of etyoid crabs. None of the two species belong to crayfishes. Since the studied cheliped material is too fragmentary and poorly preserved to be attributed confidently on species or genus level, A. laevissimus and A. cenomanensis are considered nomina dubia.
捷克共和国甲壳类化石的两种归属于欧洲小龙虾AstacusFabricius, 1775: a . laevissimusFritsch &;卡夫卡，1887年和A.诺曼尼斯·弗里奇;卡夫卡,1887年。这两种动物都来自海洋沉积物，这让它们被归为小龙虾的身份变得可疑。被划归为laevissimus的标本实际上对应于鼻祖类短爪动物的propodi。沙蟹的类型材料是异质的，包括残缺的栉蟹(thalassin总科)丙足和分离的类爪蟹爪指。这两种都不属于小龙虾。由于所研究的螯合材料太过碎片化且保存不良，无法自信地归因于种或属水平，因此认为A. laevissimus和A. cenomanensis被认为是名义上的dubia。
{"title":"Remains of decapod crustaceans from the late Cenomanian and early Turonian of the Czech Republic mistakenly assigned to crayfishes (Astacoidea)","authors":"Martina Kočová Veselská, Tadashi Kawai, Denis Audo","doi":"10.1093/jcbiol/ruad060","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad060","url":null,"abstract":"Abstract Two species of fossil crustaceans from the Czech Republic are assigned to AstacusFabricius, 1775, a European crayfish: A. laevissimusFritsch & Kafka, 1887 and A. cenomanensisFritsch & Kafka, 1887. Both come from marine sediments, making doubtful their assignment to crayfishes. Specimens assigned to Astacus laevissimus correspond in fact to propodi of etyoid brachyurans. The type material of A. cenomanensis is heterogeneous, comprising fragmentary ctenochelid (Thalassinidea) propodi and isolated cheliped fingers of etyoid crabs. None of the two species belong to crayfishes. Since the studied cheliped material is too fragmentary and poorly preserved to be attributed confidently on species or genus level, A. laevissimus and A. cenomanensis are considered nomina dubia.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135976845","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}
Abstract The morphologies of only 10 of the 93 described species of Aegla Leach, 1820 are known. We describe and illustrate the external morphology of newly-hatched, first-stage juveniles of Aegla jacutinga Marçal & Teixeira in Marçal, Páez, Souza-Shibatta, Sofia & Teixeira, 2020 using light microscopy and scanning electron microscopy (SEM) comparing them with the same stage in other congeners and providing diagnostic characters. Aegla is morphologically a conservative genus, which creates many problems in the identification of its many cryptic species. It thus becomes necessary to refine the taxonomic characters used in the taxonomy of the group by providing a new sets of morphological characters to be analyzed.
{"title":"Description of the first-stage juvenile of <i>Aegla jacutinga</i> Marçal & Teixeira in Marçal, Páez, Souza-Shibatta, Sofia & Teixeira, 2020 (Decapoda: Anomura: Aeglidae) from southeastern Brazil","authors":"Priscila S R Frazato, Gustavo M Teixeira","doi":"10.1093/jcbiol/ruad062","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad062","url":null,"abstract":"Abstract The morphologies of only 10 of the 93 described species of Aegla Leach, 1820 are known. We describe and illustrate the external morphology of newly-hatched, first-stage juveniles of Aegla jacutinga Marçal & Teixeira in Marçal, Páez, Souza-Shibatta, Sofia & Teixeira, 2020 using light microscopy and scanning electron microscopy (SEM) comparing them with the same stage in other congeners and providing diagnostic characters. Aegla is morphologically a conservative genus, which creates many problems in the identification of its many cryptic species. It thus becomes necessary to refine the taxonomic characters used in the taxonomy of the group by providing a new sets of morphological characters to be analyzed.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"203 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136318186","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}
Abstract Crayfishes are rather rare in the fossil record, limiting our understanding of their evolutionary history. We describe and discuss a fossil crayfish from the Miocene of Slovenia. This fossil, comprising only the cephalothorax, first pereiopod, and another cheliped, seems closely allied to AustropotamobiusSkorikov, 1907, but also bears an epistome and postorbital carina reminiscent of AstacusFabricius, 1775. For these reasons, it is tentatively assigned to Austropotamobius. It differs from all other Austropotamobius species by the shapes of its epistome cephalic lobe, and postorbital carina, and resemble Austropotamobius torrentium (von Paula Schrank, 1803) most due to its ornamentation. It is therefore described as a new species, Austropotamobius plenicarisp. nov. The new species is associated with brackish water ostracods, most likely reworked from slightly older sediments, suggesting a late Miocene (Messinian) age. The origin of this species and its age show it lived long after the split between Astacus and Austropotamobius, and also probably after the split between the two Austropotamobius species (Au. pallipes and Au. torrentium), and may have been contemporary to, and lived in the area of the diversification of Au. torrentium haplotypes.
小龙虾在化石记录中相当罕见，限制了我们对其进化史的理解。我们描述和讨论来自斯洛文尼亚中新世的小龙虾化石。该化石仅包括头胸，第一种视足动物和另一种足跖动物，似乎与AustropotamobiusSkorikov(1907)密切相关，但也具有令人想起AstacusFabricius(1775)的epistome和后隆突。由于这些原因，它暂时被分配给奥斯波塔莫比斯。它不同于所有其他的Austropotamobius物种的形状是它的头状叶和后脊状突起，而与Austropotamobius torrentium (von Paula Schrank, 1803)最相似的是它的纹饰。因此，它被描述为一个新种，Austropotamobius plenicarisp。11 .这个新物种与咸淡水介形类有关，很可能是在稍古老的沉积物中重新加工而成的，表明它是在中新世晚期(墨西尼亚)。这个物种的起源和年龄表明，它生活在阿斯塔克斯和南波塔莫比斯分裂之后很长一段时间，也可能是在两个南波塔比斯物种分裂之后。苍白和Au。torrentium)，可能与Au同时代，并生活在Au多样化的地区。torrentium单。
{"title":"A new species of <i>Austropotamobius</i> Skorikov, 1907 (Decapoda: Astacidae: Astacidae) from the late Miocene (Messinian) of Slovenia, with remarks on the evolution of European crayfishes","authors":"Rok Gašparič, Denis Audo, Tadashi Kawai, Tea Kolar-Jurkovšek, Miha Marinšek, Bogdan Jurkovšek","doi":"10.1093/jcbiol/ruad058","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad058","url":null,"abstract":"Abstract Crayfishes are rather rare in the fossil record, limiting our understanding of their evolutionary history. We describe and discuss a fossil crayfish from the Miocene of Slovenia. This fossil, comprising only the cephalothorax, first pereiopod, and another cheliped, seems closely allied to AustropotamobiusSkorikov, 1907, but also bears an epistome and postorbital carina reminiscent of AstacusFabricius, 1775. For these reasons, it is tentatively assigned to Austropotamobius. It differs from all other Austropotamobius species by the shapes of its epistome cephalic lobe, and postorbital carina, and resemble Austropotamobius torrentium (von Paula Schrank, 1803) most due to its ornamentation. It is therefore described as a new species, Austropotamobius plenicarisp. nov. The new species is associated with brackish water ostracods, most likely reworked from slightly older sediments, suggesting a late Miocene (Messinian) age. The origin of this species and its age show it lived long after the split between Astacus and Austropotamobius, and also probably after the split between the two Austropotamobius species (Au. pallipes and Au. torrentium), and may have been contemporary to, and lived in the area of the diversification of Au. torrentium haplotypes.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"70 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136318187","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}
Emilio Alejandro Alemany-Rodríguez, Sergio Hernández-Trujillo, Yadian Israel La Rosa-Izquierdo
Abstract Estimates of the prevalence of dead zooplankton are increasingly necessary in marine ecological studies. We aimed to identify the relative proportions of live/dead individuals of three of the historically most abundant taxa of zooplankton in Magdalena Bay, Mexico: copepods, decapods, and diplostracans. Abundance data and environmental variability were recorded monthly at neap tides during 2015–2018. Samples were stained with neutral red to distinguish living from dead individuals. Copepods were the most abundant group and showed a significant annual variability in their abundance during the study period. Influenced by a preceding warm spell and the El Niño event of 2015–2016, the lowest abundances and the highest recorded standing mortalities of all three taxa were reported in 2015; standing mortality during El Niño was double that otherwise observed. A significant correlation was found between some of the environmental variables analyzed (salinity, temperature) and increased standing mortalities in copepods and decapods. We found differences between the percentages of live/dead organisms between the years analyzed and also between the taxonomic groups involved (copepods 17%, decapods 21%), which underlines the importance of including mortality analyses in ecological studies of zooplankton.
{"title":"Temporal variability of abundance and non-predation mortality of some major groups of crustacean zooplankton (Diplostraca, Copepoda, and Decapoda) in Magdalena Bay, Baja California, Mexico","authors":"Emilio Alejandro Alemany-Rodríguez, Sergio Hernández-Trujillo, Yadian Israel La Rosa-Izquierdo","doi":"10.1093/jcbiol/ruad056","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad056","url":null,"abstract":"Abstract Estimates of the prevalence of dead zooplankton are increasingly necessary in marine ecological studies. We aimed to identify the relative proportions of live/dead individuals of three of the historically most abundant taxa of zooplankton in Magdalena Bay, Mexico: copepods, decapods, and diplostracans. Abundance data and environmental variability were recorded monthly at neap tides during 2015–2018. Samples were stained with neutral red to distinguish living from dead individuals. Copepods were the most abundant group and showed a significant annual variability in their abundance during the study period. Influenced by a preceding warm spell and the El Niño event of 2015–2016, the lowest abundances and the highest recorded standing mortalities of all three taxa were reported in 2015; standing mortality during El Niño was double that otherwise observed. A significant correlation was found between some of the environmental variables analyzed (salinity, temperature) and increased standing mortalities in copepods and decapods. We found differences between the percentages of live/dead organisms between the years analyzed and also between the taxonomic groups involved (copepods 17%, decapods 21%), which underlines the importance of including mortality analyses in ecological studies of zooplankton.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136234900","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}
Abstract The crustacean infraorder Astacidea is represented by two freshwater (Astacoidea and Parastacoidea) and two marine superfamilies (Enoplometopoidea and Nephropoidea). The antennule setation and sternal morphology were examined in specimens of 1) Parastacoidea: Cherax destructor, C. quadricarinatus, and C. tenuimanus from the Australian mainland; Astacopsis franklinii from Tasmania; C. gherardii, C. monticola, C. peknyi, and C. snowden from New Guinea; Paranephrops planifrons from New Zealand; Parastacus brasiliensis from Brazil; P. pugnax from Chile; and Astacoides madagascarensis from Madagascar; 2) Astacoidea: Pacifastacus leniusculus from Japan (where it is non-native); Procambarus clarkii and P. virginalis from the aquarium trade; and Cambaroides dauricus, C. schrenckii, C. similis, and C. wladiwostockiensis from Russia; 3) Enoplometopoidea: Enoplometopus chacei from Japan; E. debelius and E. occidentalis from the aquarium trade; and 4) Nephropoidea: Homarus americanus from the USA fish market; Metanephrops neptunus from Taiwan; and Metanephrops japonicus, Nephropsis stewari, and Thaumastocheles japonicus from Japan. Antennular setation and sternal morphology were identified as key taxonomic characters to distinguish between the four Astacid superfamilies (Astacoidea, Parastacoidea, Enoplometopoidea, and Nephropoidea). The two new key characters are described and illustrated in detail.
{"title":"The antennular setation and sternal morphology of parastacid crayfishes, with a comparison across Astacidea (Decapoda)","authors":"Tadashi Kawai, Jiří Patoka","doi":"10.1093/jcbiol/ruad061","DOIUrl":"https://doi.org/10.1093/jcbiol/ruad061","url":null,"abstract":"Abstract The crustacean infraorder Astacidea is represented by two freshwater (Astacoidea and Parastacoidea) and two marine superfamilies (Enoplometopoidea and Nephropoidea). The antennule setation and sternal morphology were examined in specimens of 1) Parastacoidea: Cherax destructor, C. quadricarinatus, and C. tenuimanus from the Australian mainland; Astacopsis franklinii from Tasmania; C. gherardii, C. monticola, C. peknyi, and C. snowden from New Guinea; Paranephrops planifrons from New Zealand; Parastacus brasiliensis from Brazil; P. pugnax from Chile; and Astacoides madagascarensis from Madagascar; 2) Astacoidea: Pacifastacus leniusculus from Japan (where it is non-native); Procambarus clarkii and P. virginalis from the aquarium trade; and Cambaroides dauricus, C. schrenckii, C. similis, and C. wladiwostockiensis from Russia; 3) Enoplometopoidea: Enoplometopus chacei from Japan; E. debelius and E. occidentalis from the aquarium trade; and 4) Nephropoidea: Homarus americanus from the USA fish market; Metanephrops neptunus from Taiwan; and Metanephrops japonicus, Nephropsis stewari, and Thaumastocheles japonicus from Japan. Antennular setation and sternal morphology were identified as key taxonomic characters to distinguish between the four Astacid superfamilies (Astacoidea, Parastacoidea, Enoplometopoidea, and Nephropoidea). The two new key characters are described and illustrated in detail.","PeriodicalId":54850,"journal":{"name":"Journal of Crustacean Biology","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136234282","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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