Pub Date : 2021-07-03DOI: 10.1080/13235818.2021.1946895
Ryosuke Matsushima, T. Haga
ABSTRACT Slugs are polyphagous herbivores that damage various crops. The genus Deroceras is primarily herbivorous; however, certain species are known to feed on various types of organic matter. In this study, we documented field observations of predation by Deroceras on eggs of the water scavenger beetle Coelostoma stultum at the waterside of paddy fields in central Japan and identified the predator species by DNA barcoding. Molecular phylogenetic analyses revealed that the slugs found sympatrically with C. stultum are Deroceras laeve, whose two haplotypes are widely distributed throughout the Palearctic and eastern margin of Asia. In two of three observed predation events, D. laeve thrust its head into the egg cocoon and preyed on eggs while C. stultum females were spinning. In the other event, no females spinning egg cocoons were observed. Due to the relatively large body size of the slug, it may push the female beetle away and prey on eggs. Considering the native distribution range of these two species, invasion of D. laeve has resulted in a new combination of predator–prey relationships in Japan between D. laeve and native C. stultum. It is a matter of concern that slugs may establish predatory pressures that threaten C. stultum.
{"title":"Predation on the egg of Coelostoma stultum (Coleoptera: Hydrophilidae) by the alien species Deroceras laeve (Mollusca: Gastropoda: Agriolimacidae)","authors":"Ryosuke Matsushima, T. Haga","doi":"10.1080/13235818.2021.1946895","DOIUrl":"https://doi.org/10.1080/13235818.2021.1946895","url":null,"abstract":"ABSTRACT Slugs are polyphagous herbivores that damage various crops. The genus Deroceras is primarily herbivorous; however, certain species are known to feed on various types of organic matter. In this study, we documented field observations of predation by Deroceras on eggs of the water scavenger beetle Coelostoma stultum at the waterside of paddy fields in central Japan and identified the predator species by DNA barcoding. Molecular phylogenetic analyses revealed that the slugs found sympatrically with C. stultum are Deroceras laeve, whose two haplotypes are widely distributed throughout the Palearctic and eastern margin of Asia. In two of three observed predation events, D. laeve thrust its head into the egg cocoon and preyed on eggs while C. stultum females were spinning. In the other event, no females spinning egg cocoons were observed. Due to the relatively large body size of the slug, it may push the female beetle away and prey on eggs. Considering the native distribution range of these two species, invasion of D. laeve has resulted in a new combination of predator–prey relationships in Japan between D. laeve and native C. stultum. It is a matter of concern that slugs may establish predatory pressures that threaten C. stultum.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1946895","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48621050","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}
Pub Date : 2021-07-03DOI: 10.1080/13235818.2021.1966163
Katherine Lockton, H. Spencer
ABSTRACT Genetic investigations of members of the bivalve genus Lasaea have revealed unexpected diversity in the genus, as well as close affiliations between geographically distant populations. Here we investigate the phylogeography of the New Zealand species L. hinemoa using mitochondrial and nuclear gene sequences (cytochrome c oxidase subunit III and Internal Transcribed Spacer 2, respectively) from populations around the country. Additionally, we designed novel microsatellite markers, which enabled us to check the specific species status implied by the two single-gene markers. Lasaea hinemoa individuals fell into four clades. Clades I and III were numerically dominant, with a suggestion of some biogeographic structure around the coasts of mainland New Zealand, and we argue they represent separate cryptic species. Samples from the subantarctic Antipodes Island contained individuals from two clades (I and II). The latter clade is close to populations from the Kerguelen Islands, which suggests possible transoceanic dispersal via the Antarctic Circumpolar Current. Clade IV, represented by small numbers of individuals from Picton and Mahia, appears to be the result of transoceanic dispersal by yet another Lasaea species.
{"title":"Phylogeography of the intertidal marine bivalve Lasaea hinemoa (Mollusca: Bivalvia) in New Zealand","authors":"Katherine Lockton, H. Spencer","doi":"10.1080/13235818.2021.1966163","DOIUrl":"https://doi.org/10.1080/13235818.2021.1966163","url":null,"abstract":"ABSTRACT Genetic investigations of members of the bivalve genus Lasaea have revealed unexpected diversity in the genus, as well as close affiliations between geographically distant populations. Here we investigate the phylogeography of the New Zealand species L. hinemoa using mitochondrial and nuclear gene sequences (cytochrome c oxidase subunit III and Internal Transcribed Spacer 2, respectively) from populations around the country. Additionally, we designed novel microsatellite markers, which enabled us to check the specific species status implied by the two single-gene markers. Lasaea hinemoa individuals fell into four clades. Clades I and III were numerically dominant, with a suggestion of some biogeographic structure around the coasts of mainland New Zealand, and we argue they represent separate cryptic species. Samples from the subantarctic Antipodes Island contained individuals from two clades (I and II). The latter clade is close to populations from the Kerguelen Islands, which suggests possible transoceanic dispersal via the Antarctic Circumpolar Current. Clade IV, represented by small numbers of individuals from Picton and Mahia, appears to be the result of transoceanic dispersal by yet another Lasaea species.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42468989","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}
Pub Date : 2021-06-27DOI: 10.1080/13235818.2021.1941726
B. Sirenko, B. Anseeuw
ABSTRACT A new genus and new species of the family Callistoplacidae from the bathyal zone near Guadeloupe Island in the Caribbean Sea are described. Caribbochiton guadeloupensis n. gen. et n. sp. is unlike other genera in the family Callistoplacidae: it has no ribs on end valves or on lateral areas of intermediate valves. According to other morphological features (thick shell, relatively narrow valves, noticeably raised lateral areas, similar slit formula, insertion plate teeth thickened at edges of slits, dorsal scales), this genus is closest to the family Callistoplacidae. Given that a number of species of the family do not have at a young age the ribs which appear later, we hypothesise that the new genus could have evolved as a result of paedomorphosis. An emended diagnosis of the family Callistoplacidae is hereby proposed. ZooBank registration: LSIDurn:lsid:zoobank.org:pub:BB94DD8F-C466-4B1B-8868-EEAB75E6930B Carribochiton LSIDurn:lsid:zoobank.org:act:EBD4411B-C39D-446C-AD24-EB5F3A27AB32 Carribochiton guadeloupensis LSIDurn:lsid:zoobank.org:act:19B8AF77-2AB8-4BD1-940A-CA4EAFFCF215
摘要本文报道了加勒比海瓜德罗普岛深水区Callistoplacidae科一新属和新种。guadeloupensis n. gen. et n. sp.加勒比石壳(Caribbochiton guadeloupensis n. gen. et n. sp.)不同于扇壳科(Callistoplacidae)的其他属:它在端瓣或中间瓣的侧面没有肋。根据其他形态特征(厚壳，相对狭窄的瓣，明显凸起的侧面，类似的狭缝，狭缝边缘加厚的插入板齿，背部鳞片)，该属与Callistoplacidae最接近。考虑到这个科的许多物种在年轻时没有后来出现的肋骨，我们假设这个新属可能是幼体发育的结果。现提出一种修正的Callistoplacidae科的诊断。ZooBank注册:LSIDurn:lsid:zoobank.org:pub:BB94DD8F-C466-4B1B-8868-EEAB75E6930B Carribochiton LSIDurn:lsid:zoobank.org:act:EBD4411B-C39D-446C-AD24-EB5F3A27AB32 Carribochiton guadeloupensis LSIDurn:lsid:zoobank.org:act:19B8AF77-2AB8-4BD1-940A-CA4EAFFCF215
{"title":"Caribbochiton guadeloupensis n. gen et n. sp. (Mollusca: Polyplacophora) from the Caribbean Sea","authors":"B. Sirenko, B. Anseeuw","doi":"10.1080/13235818.2021.1941726","DOIUrl":"https://doi.org/10.1080/13235818.2021.1941726","url":null,"abstract":"ABSTRACT A new genus and new species of the family Callistoplacidae from the bathyal zone near Guadeloupe Island in the Caribbean Sea are described. Caribbochiton guadeloupensis n. gen. et n. sp. is unlike other genera in the family Callistoplacidae: it has no ribs on end valves or on lateral areas of intermediate valves. According to other morphological features (thick shell, relatively narrow valves, noticeably raised lateral areas, similar slit formula, insertion plate teeth thickened at edges of slits, dorsal scales), this genus is closest to the family Callistoplacidae. Given that a number of species of the family do not have at a young age the ribs which appear later, we hypothesise that the new genus could have evolved as a result of paedomorphosis. An emended diagnosis of the family Callistoplacidae is hereby proposed. ZooBank registration: LSIDurn:lsid:zoobank.org:pub:BB94DD8F-C466-4B1B-8868-EEAB75E6930B Carribochiton LSIDurn:lsid:zoobank.org:act:EBD4411B-C39D-446C-AD24-EB5F3A27AB32 Carribochiton guadeloupensis LSIDurn:lsid:zoobank.org:act:19B8AF77-2AB8-4BD1-940A-CA4EAFFCF215","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1941726","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48923426","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}
Pub Date : 2021-06-27DOI: 10.1080/13235818.2021.1943601
Yoko Wada, Y. Yusa
ABSTRACT Siphonariidae is a panpulmonate family that occurs in intertidal rocky shores worldwide within temperate to tropical areas. Although the egg masses of Siphonaria sirius are commonly found in lower intertidal rocky shores in summer, there is a lack of information on their embryonic development. We examined the embryonic development and duration of S. sirius both in the laboratory and in the field. The study was conducted in Shirahama, Wakayama, Japan, during the summer of 2014 and 2015. The embryonic developmental process of S. sirius was similar to that of other planktotrophic siphonariids. However, S. sirius hatched within four days after oviposition at 27.35°C in the laboratory, which is the shortest in the Siphonariidae. In the field, hatching occurred notably faster at 1.6 days after oviposition, although the average temperature (27.42°C) was similar to that in the laboratory. The presence of egg predators, as well as other environmental factors, may be responsible for the short embryonic period of this species, especially in the field.
{"title":"Extremely short embryonic period of the intertidal pulmonate limpet Siphonaria sirius (Pilsbry, 1895)","authors":"Yoko Wada, Y. Yusa","doi":"10.1080/13235818.2021.1943601","DOIUrl":"https://doi.org/10.1080/13235818.2021.1943601","url":null,"abstract":"ABSTRACT Siphonariidae is a panpulmonate family that occurs in intertidal rocky shores worldwide within temperate to tropical areas. Although the egg masses of Siphonaria sirius are commonly found in lower intertidal rocky shores in summer, there is a lack of information on their embryonic development. We examined the embryonic development and duration of S. sirius both in the laboratory and in the field. The study was conducted in Shirahama, Wakayama, Japan, during the summer of 2014 and 2015. The embryonic developmental process of S. sirius was similar to that of other planktotrophic siphonariids. However, S. sirius hatched within four days after oviposition at 27.35°C in the laboratory, which is the shortest in the Siphonariidae. In the field, hatching occurred notably faster at 1.6 days after oviposition, although the average temperature (27.42°C) was similar to that in the laboratory. The presence of egg predators, as well as other environmental factors, may be responsible for the short embryonic period of this species, especially in the field.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1943601","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47385714","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}
Pub Date : 2021-06-20DOI: 10.1080/13235818.2021.1941575
Maitreya Sil, Reshma Basak, K. Karanth, N. A. Aravind
ABSTRACT Family Ampullariidae consists of 11 genera of freshwater snails distributed pan-tropically in the Old and the New World. One of the ampullarid genera, Pila, is distributed in Africa and Asia and consists of 28 species. Here we describe the sixth member of the genus Pila from India. Pila mizoramensis n. sp. was collected from the Northeast Indian state of Mizoram. We adopted an integrative taxonomic approach to describe this species. First, a multilocus phylogeny of the genus was built to determine its placement in the tree. Then we used pairwise distance in the cytochrome oxidase I gene to compare its divergence from its congeners. Finally morphometric data was used to show that this hill stream species of Pila does not overlap with other hill stream species in morphometric space. The morphology of the species is also discussed in detail. With the advent of molecular tools in taxonomy a plethora of new species have been described from India in the last few decades. We add this newest member of genus Pila to the growing list.ZooBank registration: http://www.zoobank.org/urn:urn:lsid:zoobank.org:pub:0ED40557-4595-49E5-99A6-8A684C5D6AB3
{"title":"A new species of Pila (Gastropoda: Ampullariidae) from Mizoram, India","authors":"Maitreya Sil, Reshma Basak, K. Karanth, N. A. Aravind","doi":"10.1080/13235818.2021.1941575","DOIUrl":"https://doi.org/10.1080/13235818.2021.1941575","url":null,"abstract":"ABSTRACT Family Ampullariidae consists of 11 genera of freshwater snails distributed pan-tropically in the Old and the New World. One of the ampullarid genera, Pila, is distributed in Africa and Asia and consists of 28 species. Here we describe the sixth member of the genus Pila from India. Pila mizoramensis n. sp. was collected from the Northeast Indian state of Mizoram. We adopted an integrative taxonomic approach to describe this species. First, a multilocus phylogeny of the genus was built to determine its placement in the tree. Then we used pairwise distance in the cytochrome oxidase I gene to compare its divergence from its congeners. Finally morphometric data was used to show that this hill stream species of Pila does not overlap with other hill stream species in morphometric space. The morphology of the species is also discussed in detail. With the advent of molecular tools in taxonomy a plethora of new species have been described from India in the last few decades. We add this newest member of genus Pila to the growing list.ZooBank registration: http://www.zoobank.org/urn:urn:lsid:zoobank.org:pub:0ED40557-4595-49E5-99A6-8A684C5D6AB3","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1941575","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791405","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}
Pub Date : 2021-04-03DOI: 10.1080/13235818.2021.1937016
H. Fukuda, S. Ishida, Tetsuya Watanabe, S. Yoshimatsu, T. Haga
ABSTRACT Species of Sunetta Link, 1807 from Japan and the neighbouring regions (Korea, China and Taiwan) are revised taxonomically. Eight species of the subgenus Sunemeroe Iredale, 1930 are recognised: Sunetta beni n.sp., S. crassatelliformis Haga and H. Fukuda, n.sp., S. cumingii E.A. Smith, 1891, S. kirai Huber, 2010, S. langfordi (Habe, 1953), S. menstrualis (Menke, 1843) S. nomurai Haga and H. Fukuda, n.sp., and S. sunettina (Jousseaume, 1891). Although S. beni has long been misidentified as S. solanderii (Gray, 1825) from the Indian Ocean, it is distinguishable from all other Sunemeroe species in having a small, oval and inflated shell with a round posterior end and a broad and deeply sunken escutcheon. Sunetta crassatelliformis is a Lower Pleistocene species endemic to Japan. Another fossil species S. nomurai is known from the Pleistocene of Taiwan. Sunetta cumingii, a little-known Recent species from southwestern Japan and Taiwan, is separable from S. sunettina (= S. contempta E.A. Smith, 1891), which has often been regarded as synonymous. Amongst the six Recent species only S. sunettina is widely distributed in the Indo-West Pacific; the other five have narrower geographical ranges around Japan. Sunetta beni and S. menstrualis are thought to be threatened due to habitat loss.
摘要对日本及其邻近地区(韩国、中国和台湾)的Sunetta Link, 1807的种进行了分类订正。1930年已确认的苏尼塔·贝尼亚属8种;(1)，陈志强，陈志强，等。， S. cumingii E.A. Smith, 1891, S. kirai Huber, 2010, S. langfordi (Habe, 1953)， S. Menke, 1843)， S. nomurai Haga和H. Fukuda, n.p.。S. sunettina (jouseaume, 1891)。尽管贝氏海螺长期以来一直被误认为是来自印度洋的索安德海螺(Gray, 1825)，但它与其他所有日emeroe物种的区别在于，它有一个小的、椭圆形的、膨胀的壳，后端是圆形的，还有一个宽而深凹的盾形纹饰。Sunetta crassatelliformis是日本特有的下更新世种。另一个化石种是台湾更新世的S. nomurai。Sunetta cumingii是一种来自日本西南部和台湾的鲜为人知的近代种，它与S. sunettina (= S. conceta E.A. Smith, 1891)是可分离的，两者通常被认为是同义词。在最近的6种中，只有S. sunettina广泛分布于印度-西太平洋;其他五个在日本周围的地理范围较窄。据认为，由于栖息地的丧失，苏内塔贝尼和月经夜蛾受到了威胁。
{"title":"The bivalve genus Sunetta Link, 1807 (Heterodonta: Veneridae) of Japan and the neighbouring waters – a taxonomic revision with the descriptions of three new species","authors":"H. Fukuda, S. Ishida, Tetsuya Watanabe, S. Yoshimatsu, T. Haga","doi":"10.1080/13235818.2021.1937016","DOIUrl":"https://doi.org/10.1080/13235818.2021.1937016","url":null,"abstract":"ABSTRACT\u0000 Species of Sunetta Link, 1807 from Japan and the neighbouring regions (Korea, China and Taiwan) are revised taxonomically. Eight species of the subgenus Sunemeroe Iredale, 1930 are recognised: Sunetta beni n.sp., S. crassatelliformis Haga and H. Fukuda, n.sp., S. cumingii E.A. Smith, 1891, S. kirai Huber, 2010, S. langfordi (Habe, 1953), S. menstrualis (Menke, 1843) S. nomurai Haga and H. Fukuda, n.sp., and S. sunettina (Jousseaume, 1891). Although S. beni has long been misidentified as S. solanderii (Gray, 1825) from the Indian Ocean, it is distinguishable from all other Sunemeroe species in having a small, oval and inflated shell with a round posterior end and a broad and deeply sunken escutcheon. Sunetta crassatelliformis is a Lower Pleistocene species endemic to Japan. Another fossil species S. nomurai is known from the Pleistocene of Taiwan. Sunetta cumingii, a little-known Recent species from southwestern Japan and Taiwan, is separable from S. sunettina (= S. contempta E.A. Smith, 1891), which has often been regarded as synonymous. Amongst the six Recent species only S. sunettina is widely distributed in the Indo-West Pacific; the other five have narrower geographical ranges around Japan. Sunetta beni and S. menstrualis are thought to be threatened due to habitat loss.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1937016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44506015","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}
Pub Date : 2021-04-03DOI: 10.1080/13235818.2021.1892474
V. V. Adamova
ABSTRACT The Caucasian snail Harmozica ravergiensis Férussac, 1835 (Gastropoda, Stylommatophora, Hygromiidae) and the Crimean snail Brephulopsis cylindrica Menke, 1828 (Gastropoda, Stylommatophora, Enidae) have been spreading across the northern borders of their ranges in recent years. Here I present a study of the variability of ISSR loci in the populations of H. ravergiensis and B. cylindrica outside their natural range, in the south of the Central Russian Upland (Belgorod Region, Russia). A comparison is made with populations of these snail species in their native area (respectively, the Caucasus and Crimea). Genetic polymorphism is generally at the same level in alien and natural populations of the species. However, in some geographically isolated alien populations, the variability indices are lower than in the native area. The level of genetic differentiation between geographically distant populations indicates different sources of invasion. A high level of genetic differentiation was also detected between native populations. No isolation by distance was found for the Belgorod populations of H. ravergiensis (Mantel test, R2=0.065; P = 0.110). The exchange of migrants between these local populations is probably occurring anthropogenically.
{"title":"Genetic variation in non-indigenous populations of the land snails Harmozica ravergiensis and Brephulopsis cylindrica (Gastropoda: Stylommatophora) in the south of the Central Russian Upland (Eastern Europe)","authors":"V. V. Adamova","doi":"10.1080/13235818.2021.1892474","DOIUrl":"https://doi.org/10.1080/13235818.2021.1892474","url":null,"abstract":"ABSTRACT The Caucasian snail Harmozica ravergiensis Férussac, 1835 (Gastropoda, Stylommatophora, Hygromiidae) and the Crimean snail Brephulopsis cylindrica Menke, 1828 (Gastropoda, Stylommatophora, Enidae) have been spreading across the northern borders of their ranges in recent years. Here I present a study of the variability of ISSR loci in the populations of H. ravergiensis and B. cylindrica outside their natural range, in the south of the Central Russian Upland (Belgorod Region, Russia). A comparison is made with populations of these snail species in their native area (respectively, the Caucasus and Crimea). Genetic polymorphism is generally at the same level in alien and natural populations of the species. However, in some geographically isolated alien populations, the variability indices are lower than in the native area. The level of genetic differentiation between geographically distant populations indicates different sources of invasion. A high level of genetic differentiation was also detected between native populations. No isolation by distance was found for the Belgorod populations of H. ravergiensis (Mantel test, R2=0.065; P = 0.110). The exchange of migrants between these local populations is probably occurring anthropogenically.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1892474","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44930495","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}
Pub Date : 2021-04-03DOI: 10.1080/13235818.2021.1927465
D. Herbert
ABSTRACT A discrepancy between the well-established interpretation and use of the genus-level name Camitia Gray, 1842 and that determined by its currently accepted type species is highlighted. The paradox centres on the true identity of ‘Tr. pulcherrima Gray’ [sic], a name cited by Gray (1847) as the type species of Camitia. One interpretation of this name is that it refers to Trochus pulcherrimus, one of J.E. Gray’s many manuscript names first published by W. Wood in 1828. In which case Camitia is a subjective senior synonym of Prothalotia Thiele, 1930 – an interpretation very much at odds with its current use. Re-evaluation of ‘Tr. pulcherrima Gray’ in the light of the current concept of Camitia suggests that it represents a lapsus calami for Monodonta pulcherrima, another of Gray’s manuscript names, which was not validated until it was figured as Camitia pulcherrima H. Adams & A. Adams, 1854. The latter interpretation serves to preserve the prevailing usage of both Camitia Gray, 1842 and Prothalotia Thiele, 1930. The type species of Camitia Gray, 1842 is shown to be Camitia pulcherrima H. Adams & A. Adams, 1854 by subsequent monotypy.
{"title":"Camitia Gray, 1842 – the identity of its type species (Vetigastropoda: Trochidae)","authors":"D. Herbert","doi":"10.1080/13235818.2021.1927465","DOIUrl":"https://doi.org/10.1080/13235818.2021.1927465","url":null,"abstract":"ABSTRACT A discrepancy between the well-established interpretation and use of the genus-level name Camitia Gray, 1842 and that determined by its currently accepted type species is highlighted. The paradox centres on the true identity of ‘Tr. pulcherrima Gray’ [sic], a name cited by Gray (1847) as the type species of Camitia. One interpretation of this name is that it refers to Trochus pulcherrimus, one of J.E. Gray’s many manuscript names first published by W. Wood in 1828. In which case Camitia is a subjective senior synonym of Prothalotia Thiele, 1930 – an interpretation very much at odds with its current use. Re-evaluation of ‘Tr. pulcherrima Gray’ in the light of the current concept of Camitia suggests that it represents a lapsus calami for Monodonta pulcherrima, another of Gray’s manuscript names, which was not validated until it was figured as Camitia pulcherrima H. Adams & A. Adams, 1854. The latter interpretation serves to preserve the prevailing usage of both Camitia Gray, 1842 and Prothalotia Thiele, 1930. The type species of Camitia Gray, 1842 is shown to be Camitia pulcherrima H. Adams & A. Adams, 1854 by subsequent monotypy.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1927465","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46898391","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}
Pub Date : 2021-04-03DOI: 10.1080/13235818.2021.1927464
C. Drerup
ABSTRACT Bottletail squids (Cephalopoda: Sepiadariidae) spend the daytime buried in sediment; however, their burying behaviour has not yet been described in detail. In the present study, the burying pattern of a single tropical bottletail squid Sepiadarium kochii Steenstrup, 1881 is analysed for different behavioural characteristics. Burying in S. kochii consists of a rapid sequence of strong, alternating forward- and backward directed funnel jets which obscure the individual almost fully with sediment, followed by a single flinging movement of the dorsolateral arm pair to cover the remaining exposed body parts with sand. A comparison of the burying pattern of S. kochii with that of closely related bobtail squids (Cephalopoda: Sepiolidae) is drawn. Moreover, differences between these two cephalopod families in terms of the execution and duration of their burying procedure as well as its behavioural use are discussed.
{"title":"First detailed description of the burying behaviour of a bottletail squid, Sepiadarium kochii Steenstrup, 1881","authors":"C. Drerup","doi":"10.1080/13235818.2021.1927464","DOIUrl":"https://doi.org/10.1080/13235818.2021.1927464","url":null,"abstract":"ABSTRACT Bottletail squids (Cephalopoda: Sepiadariidae) spend the daytime buried in sediment; however, their burying behaviour has not yet been described in detail. In the present study, the burying pattern of a single tropical bottletail squid Sepiadarium kochii Steenstrup, 1881 is analysed for different behavioural characteristics. Burying in S. kochii consists of a rapid sequence of strong, alternating forward- and backward directed funnel jets which obscure the individual almost fully with sediment, followed by a single flinging movement of the dorsolateral arm pair to cover the remaining exposed body parts with sand. A comparison of the burying pattern of S. kochii with that of closely related bobtail squids (Cephalopoda: Sepiolidae) is drawn. Moreover, differences between these two cephalopod families in terms of the execution and duration of their burying procedure as well as its behavioural use are discussed.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1927464","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45990531","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}
Pub Date : 2021-03-16DOI: 10.1080/13235818.2021.1898732
A. Golikov, M. Blicher, H. Hoving, D. Zakharov, R. Sabirov
ABSTRACT Gonatus fabricii (Lichtenstein, 1818) is an ecologically important squid that spends its entire life cycle within the Arctic where it is the most abundant cephalopod. Due to the rarity of mature and reproducing females, it is unknown how many eggs females spawn (actual fecundity). Among 47,000 specimens studied between 2005 and 2019 one spent, degenerated and gelatinous female with a mantle length of 230 mm was caught in West Greenland in 2019. Examination allowed the first detailed description of fecundity and spawning pattern in the species. Oocyte development shows that the most considerable maturation of mid-vitellogenic oocytes to late vitellogenic and then to ripe stages occurs immediately after the first ripe oocytes appear in the ovary. There were no ripe oocytes in the ovary or oviducts. The ovary contained an estimated 6561 oocytes and 2551 post-ovulatory follicles and hence the total fecundity was 9112. This specimen of G. fabricii realised 28.0% of its potential fecundity which is comparable to Berryteuthis magister, which also belongs to Gonatidae, and lower than in the majority of studied deep-sea squids (including other gonatids). Spent females may provide clues as to where the major spawning areas of this abundant but poorly known squid are located.
{"title":"Actual fecundity of the Arctic squid Gonatus fabricii (Cephalopoda) based on the examination of a rarely encountered spent female","authors":"A. Golikov, M. Blicher, H. Hoving, D. Zakharov, R. Sabirov","doi":"10.1080/13235818.2021.1898732","DOIUrl":"https://doi.org/10.1080/13235818.2021.1898732","url":null,"abstract":"ABSTRACT Gonatus fabricii (Lichtenstein, 1818) is an ecologically important squid that spends its entire life cycle within the Arctic where it is the most abundant cephalopod. Due to the rarity of mature and reproducing females, it is unknown how many eggs females spawn (actual fecundity). Among 47,000 specimens studied between 2005 and 2019 one spent, degenerated and gelatinous female with a mantle length of 230 mm was caught in West Greenland in 2019. Examination allowed the first detailed description of fecundity and spawning pattern in the species. Oocyte development shows that the most considerable maturation of mid-vitellogenic oocytes to late vitellogenic and then to ripe stages occurs immediately after the first ripe oocytes appear in the ovary. There were no ripe oocytes in the ovary or oviducts. The ovary contained an estimated 6561 oocytes and 2551 post-ovulatory follicles and hence the total fecundity was 9112. This specimen of G. fabricii realised 28.0% of its potential fecundity which is comparable to Berryteuthis magister, which also belongs to Gonatidae, and lower than in the majority of studied deep-sea squids (including other gonatids). Spent females may provide clues as to where the major spawning areas of this abundant but poorly known squid are located.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1898732","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42750441","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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