Pub Date : 2021-07-03DOI: 10.1080/13235818.2021.1957552
M. Quenu, S. Trewick, Elizabeth E. Daly, M. Morgan‐Richards
ABSTRACT Placostylinae are a sub-family of terrestrial land snails endemic to the southwest Pacific. Some species are harvested for food, and others are critically endangered. Here we assemble and characterise complete mitochondrial genomes, as well as three nuclear markers (partial 45S ribosomal cassettes and the histone genes H3 and H4) of five snail species from three geographical regions (New Zealand, New Caledonia and the Solomon Islands). Mitogenomes of Placostylinae snails ranged between 14,544 bp and 14,711 bp, with minor variation in the position of tRNA tyrosine (Y) and tRNA tryptophane (W). The 45S ribosomal cassette contained intra-genomic nucleotide variation in ITS2. Cassettes containing histone genes H3 and H4 and their non-transcribed spacer region were assembled for three species, with the two genes coded in the same direction. Phylogenetic analysis on this large dataset (mitochondrial genome + nuclear markers) supported geographical clustering of species but could not confidently infer monophyly of the four Placostylus species with respect to Eumecostylus cleryi. Analysis based on shorter cytochrome c oxidase sequences with a wider taxon sampling found species representing the genera Eumecostylus and Placocharis were nested within the phylogenetic diversity of Placostylus. Multi-locus phylogenetic analysis containing mitochondrial and nuclear sequences did not support monophyly of Placostylinae.
{"title":"Generation of large mitochondrial and nuclear nucleotide sequences and phylogenetic analyses using high-throughput short-read datasets for endangered Placostylinae snails of the southwest Pacific","authors":"M. Quenu, S. Trewick, Elizabeth E. Daly, M. Morgan‐Richards","doi":"10.1080/13235818.2021.1957552","DOIUrl":"https://doi.org/10.1080/13235818.2021.1957552","url":null,"abstract":"ABSTRACT Placostylinae are a sub-family of terrestrial land snails endemic to the southwest Pacific. Some species are harvested for food, and others are critically endangered. Here we assemble and characterise complete mitochondrial genomes, as well as three nuclear markers (partial 45S ribosomal cassettes and the histone genes H3 and H4) of five snail species from three geographical regions (New Zealand, New Caledonia and the Solomon Islands). Mitogenomes of Placostylinae snails ranged between 14,544 bp and 14,711 bp, with minor variation in the position of tRNA tyrosine (Y) and tRNA tryptophane (W). The 45S ribosomal cassette contained intra-genomic nucleotide variation in ITS2. Cassettes containing histone genes H3 and H4 and their non-transcribed spacer region were assembled for three species, with the two genes coded in the same direction. Phylogenetic analysis on this large dataset (mitochondrial genome + nuclear markers) supported geographical clustering of species but could not confidently infer monophyly of the four Placostylus species with respect to Eumecostylus cleryi. Analysis based on shorter cytochrome c oxidase sequences with a wider taxon sampling found species representing the genera Eumecostylus and Placocharis were nested within the phylogenetic diversity of Placostylus. Multi-locus phylogenetic analysis containing mitochondrial and nuclear sequences did not support monophyly of Placostylinae.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"41 1","pages":"243 - 253"},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1957552","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42987671","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: 10.1080/13235818.2021.1946905
Musa K. Oladejo, O. O. Oloyede, T. Adesakin, O. Morenikeji
ABSTRACT This study investigated the abundance, distribution and diversity of freshwater snails at four sites in the Ogunpa River, Nigeria from May 2018 to December 2018. A total of 2067 freshwater snails was collected, belonging to two sub-classes, four families, and seven species: Physella acuta, Amerianna carinata, Melanoides tuberculata, Physa waterloti, Bulinus globosus, Bulinus senegalensis, and Lymnaea natalensis. Invasive freshwater snails (82.15%) were more abundant than indigenous species (17.85%). Physella acuta (30.05%) and P. waterloti (20.61%) were the most abundant species, while B. globosus (4.35%) and B. senegalensis (3.92%) were the least abundant. The presence of P. acuta, B. globosus, B. senegalensis, and M. tuberculata constitute potential economic and health risks to animals and humans in contact with this waterbody. Freshwater snail numbers showed variation among sites, seasons, and site-season interactions. Water depth, turbidity, and pH correlated significantly with the numbers of freshwater snails, except that pH did not correlate with P. waterloti. There were strong positive correlations between the numbers of molluscs and the abundance of Commelina diffusa, Amaranthus spinosus, Murdannia nudiflora, and Ipomoea aquatica. Stepwise multiple regression showed that water depth, C. diffusa, and Sacciolepis africana were the primary variables affecting snail distribution and abundance in the Ogunpa River.
{"title":"The abundance, distribution and diversity of invasive and indigenous freshwater snails in a section of the Ogunpa River, southwest Nigeria","authors":"Musa K. Oladejo, O. O. Oloyede, T. Adesakin, O. Morenikeji","doi":"10.1080/13235818.2021.1946905","DOIUrl":"https://doi.org/10.1080/13235818.2021.1946905","url":null,"abstract":"ABSTRACT This study investigated the abundance, distribution and diversity of freshwater snails at four sites in the Ogunpa River, Nigeria from May 2018 to December 2018. A total of 2067 freshwater snails was collected, belonging to two sub-classes, four families, and seven species: Physella acuta, Amerianna carinata, Melanoides tuberculata, Physa waterloti, Bulinus globosus, Bulinus senegalensis, and Lymnaea natalensis. Invasive freshwater snails (82.15%) were more abundant than indigenous species (17.85%). Physella acuta (30.05%) and P. waterloti (20.61%) were the most abundant species, while B. globosus (4.35%) and B. senegalensis (3.92%) were the least abundant. The presence of P. acuta, B. globosus, B. senegalensis, and M. tuberculata constitute potential economic and health risks to animals and humans in contact with this waterbody. Freshwater snail numbers showed variation among sites, seasons, and site-season interactions. Water depth, turbidity, and pH correlated significantly with the numbers of freshwater snails, except that pH did not correlate with P. waterloti. There were strong positive correlations between the numbers of molluscs and the abundance of Commelina diffusa, Amaranthus spinosus, Murdannia nudiflora, and Ipomoea aquatica. Stepwise multiple regression showed that water depth, C. diffusa, and Sacciolepis africana were the primary variables affecting snail distribution and abundance in the Ogunpa River.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"41 1","pages":"222 - 234"},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1946905","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46951480","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: 10.1080/13235818.2021.1962594
F. Wells, J. Browne, R. Loh, M. Massam, John McKinney
ABSTRACT A mass mortality of the sea hare Aplysia gigantea at Augusta, Western Australia was first reported to local authorities on 10 February 2021. The number of dead sea hares on the beach increased rapidly, until thousands were to be seen on a 4 km stretch; the maximum density of dead individuals was estimated at 20–30/m2. We suggest the mortality was caused by weather conditions that washed the animals ashore, where they died. Weather conditions changed on 17 March and the dead sea hares were washed back out to sea.
{"title":"Mass mortality of the black sea hare Aplysia gigantea (Gastropoda: Aplysiidae) at Augusta, Western Australia in the austral summer of 2021","authors":"F. Wells, J. Browne, R. Loh, M. Massam, John McKinney","doi":"10.1080/13235818.2021.1962594","DOIUrl":"https://doi.org/10.1080/13235818.2021.1962594","url":null,"abstract":"ABSTRACT A mass mortality of the sea hare Aplysia gigantea at Augusta, Western Australia was first reported to local authorities on 10 February 2021. The number of dead sea hares on the beach increased rapidly, until thousands were to be seen on a 4 km stretch; the maximum density of dead individuals was estimated at 20–30/m2. We suggest the mortality was caused by weather conditions that washed the animals ashore, where they died. Weather conditions changed on 17 March and the dead sea hares were washed back out to sea.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"41 1","pages":"269 - 273"},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13235818.2021.1962594","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43922844","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: 10.1080/13235818.2021.1962588
P. Southgate, T. Militz, M. Roberts
ABSTRACT A new morphologically distinct species of cowry (family Cypraeidae Rafinesque, 1815) is described from the Pliocene of Flinders Island, Tasmania. Diagnostic features of Umbilia furneauxensis n. sp. include relatively small size (<60 mm), extension of apertural dentition to at least midway on the ventrum and labrum, and heavily callused margins with numerous shallow depressions forming a dimpled surface that may extend on to the base. It is the third Umbilia species to be recognised from the Australian Pliocene. ZooBank registration: http://zoobank.org/urn:lsid:zoobank.org:pub:4B6291F2-DA31-4A00-A223-268A83F480AE
摘要:本文报道了塔斯马尼亚州弗林德斯岛上新世一种形态独特的菊科(Cypraeidae Rafinesque, 1815)。furneauxensis n. spp .的诊断特征包括相对较小的尺寸(<60毫米)，孔齿延伸到至少腹膜和唇部的中间，边缘有大量的老茧，有许多浅凹陷形成一个凹陷的表面，可能延伸到基部。这是第三个被确认来自澳大利亚上新世的脐带物种。ZooBank注册:http://zoobank.org/urn:lsid:zoobank.org:pub:4B6291F2-DA31-4A00-A223-268A83F480AE
{"title":"A new species of Umbilia Jousseaume, 1884 (Mollusca: Cypraeidae) from the Australian Pliocene","authors":"P. Southgate, T. Militz, M. Roberts","doi":"10.1080/13235818.2021.1962588","DOIUrl":"https://doi.org/10.1080/13235818.2021.1962588","url":null,"abstract":"ABSTRACT A new morphologically distinct species of cowry (family Cypraeidae Rafinesque, 1815) is described from the Pliocene of Flinders Island, Tasmania. Diagnostic features of Umbilia furneauxensis n. sp. include relatively small size (<60 mm), extension of apertural dentition to at least midway on the ventrum and labrum, and heavily callused margins with numerous shallow depressions forming a dimpled surface that may extend on to the base. It is the third Umbilia species to be recognised from the Australian Pliocene. ZooBank registration: http://zoobank.org/urn:lsid:zoobank.org:pub:4B6291F2-DA31-4A00-A223-268A83F480AE","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"41 1","pages":"214 - 221"},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47705042","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: 10.1080/13235818.2021.1970352
Nipu Kumar Das, N. A. Aravind
ABSTRACT A new species of Diplommatina Benson, 1849 from Sikkim, Northeast India is described based on shell morphology. This new species is found to be distinct in its externally visible large parietal tooth, and in the absence of a columellar tooth on the shell aperture. A detailed comparison with the closest congeners of the new species is provided. Diplommatina bidentata Vermeulen, Liew & Schilthuizen, 2015 from Malaysia is the only morphologically similar species with a tooth on the parietal lip, but it differs from the new species in having a tooth on the columellar lip as well as other shell characters. A checklist is also given for all the described Diplommatina species from North East India, as well as those from Darjeeling, West Bengal. http://www.zoobank.org/lsid:zoobank.org:act:0C252457-39A9-4451-AA24-8CA37F0A6271
{"title":"A new species of land snail from the genus Diplommatina Benson, 1849 (Gastropoda, Caenogastropoda, Diplommatinidae) from Sikkim Himalaya, North East India","authors":"Nipu Kumar Das, N. A. Aravind","doi":"10.1080/13235818.2021.1970352","DOIUrl":"https://doi.org/10.1080/13235818.2021.1970352","url":null,"abstract":"ABSTRACT A new species of Diplommatina Benson, 1849 from Sikkim, Northeast India is described based on shell morphology. This new species is found to be distinct in its externally visible large parietal tooth, and in the absence of a columellar tooth on the shell aperture. A detailed comparison with the closest congeners of the new species is provided. Diplommatina bidentata Vermeulen, Liew & Schilthuizen, 2015 from Malaysia is the only morphologically similar species with a tooth on the parietal lip, but it differs from the new species in having a tooth on the columellar lip as well as other shell characters. A checklist is also given for all the described Diplommatina species from North East India, as well as those from Darjeeling, West Bengal. http://www.zoobank.org/lsid:zoobank.org:act:0C252457-39A9-4451-AA24-8CA37F0A6271","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"41 1","pages":"262 - 268"},"PeriodicalIF":1.0,"publicationDate":"2021-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49343392","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: 10.1080/13235818.2021.1946895
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":"41 1","pages":"254 - 261"},"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":"41 1","pages":"191 - 203"},"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":"41 1","pages":"183 - 190"},"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":"41 1","pages":"235 - 242"},"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":"41 1","pages":"204 - 213"},"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}
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