Pub Date : 2023-11-10DOI: 10.1080/13235818.2023.2277834
Isma Merad, Amina Rabeï, Noureddine Soltani
ABSTRACTTo investigate the impact of heavy metals on the physiology of aquatic organisms, previous studies have focused on selected biomarker measurements in samples. However, most studies do not take into account toxicity effects on both males and females. The present paper aims to examine the effect of sex on the detoxification response using metallothioneins (MTs), a biomarker of metallic contamination. MTs were measured in different organs (mantle, digestive gland and gonad) of both males and females of Donax trunculus L. (Mollusca, Bivalvia) exposed to cadmium (Cd). The samples were collected at El Battah beach, far from any source of pollution, and reared in the laboratory for four days. Cd was added to the rearing water at two previously determined sublethal concentrations (LC10 and LC25). Measurements of MTs were made at (0, 48 and 96 h). Cd exposure caused a significant induction (P < 0.05) of MTs in all studied organs in both sexes with a marked effect in females. The digestive gland had the highest MT levels, followed by the gonad and then mantle. Female and male individuals of this species differ in their susceptibility to Cd. This study supports the importance of sex and tissue in ecotoxicological studies.KEYWORDS: Biomarkerdigestive glandfemalegonadheavy metalsmalemantlemolluscs AcknowledgementsThe authors wish to thank anonymous referees for useful discussions and critical reading of the manuscript. This study was conducted as part of a PRFU project (Pr. N. Soltani), and was supported by the National Fund allocated to Research Laboratory of Applied Animal Biology (University Badji Mokhtar, Annaba).Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"Sex-specific differences in metallothionein induction by cadmium in different organs of <i>Donax trunculus</i> Linnaeus, 1758","authors":"Isma Merad, Amina Rabeï, Noureddine Soltani","doi":"10.1080/13235818.2023.2277834","DOIUrl":"https://doi.org/10.1080/13235818.2023.2277834","url":null,"abstract":"ABSTRACTTo investigate the impact of heavy metals on the physiology of aquatic organisms, previous studies have focused on selected biomarker measurements in samples. However, most studies do not take into account toxicity effects on both males and females. The present paper aims to examine the effect of sex on the detoxification response using metallothioneins (MTs), a biomarker of metallic contamination. MTs were measured in different organs (mantle, digestive gland and gonad) of both males and females of Donax trunculus L. (Mollusca, Bivalvia) exposed to cadmium (Cd). The samples were collected at El Battah beach, far from any source of pollution, and reared in the laboratory for four days. Cd was added to the rearing water at two previously determined sublethal concentrations (LC10 and LC25). Measurements of MTs were made at (0, 48 and 96 h). Cd exposure caused a significant induction (P < 0.05) of MTs in all studied organs in both sexes with a marked effect in females. The digestive gland had the highest MT levels, followed by the gonad and then mantle. Female and male individuals of this species differ in their susceptibility to Cd. This study supports the importance of sex and tissue in ecotoxicological studies.KEYWORDS: Biomarkerdigestive glandfemalegonadheavy metalsmalemantlemolluscs AcknowledgementsThe authors wish to thank anonymous referees for useful discussions and critical reading of the manuscript. This study was conducted as part of a PRFU project (Pr. N. Soltani), and was supported by the National Fund allocated to Research Laboratory of Applied Animal Biology (University Badji Mokhtar, Annaba).Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"40 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135093473","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 Freshwater lymnaeid snails, for example Radix rubiginosa, may serve a crucial role as the sole intermediate hosts of several trematodes of medical or veterinary importance causing diseases in livestock and humans including fascioliasis, schistosomiasis and echinostomiasis. In Thailand, there is little information on the genetic variation of lymnaeid snails. Thus, this study explores the mitochondrial cytochrome c oxidase subunit I (COI) sequence variation of lymnaeid and physid snails collected from different geographical areas in Thailand, with the main focus on R. rubiginosa. In all, 175 R. rubiginosa, 7 Orientogalba sp., 9 Racesina sp., and 61 Physella acuta were collected from 36 localities in Thailand. A high level of genetic variation was detected in R. rubiginosa, with 40 haplotypes being recorded. Phylogenetic analyses revealed two clades (possibly species) in the material identified as R. rubiginosa. One clade contained all samples examined in this study, together with a sequence from Indonesia, while the second clade comprised specimens found in Singapore, Malaysia, and Vietnam. Seven haplotypes of P. acuta were clustered into clade A, the globally invasive lineage of this species.
{"title":"Genetic variation of the lymnaeid <i>Radix rubiginosa</i> (Michelin, 1831) (Mollusca, Gastropoda) and other freshwater snails in Thailand examined using mitochondrial COI sequences","authors":"Chairat Tantrawatpan, Bangon Kongim, Takeshi Agatsuma, Warayutt Pilap, Weerachai Saijuntha","doi":"10.1080/13235818.2023.2261174","DOIUrl":"https://doi.org/10.1080/13235818.2023.2261174","url":null,"abstract":"ABSTRACT Freshwater lymnaeid snails, for example Radix rubiginosa, may serve a crucial role as the sole intermediate hosts of several trematodes of medical or veterinary importance causing diseases in livestock and humans including fascioliasis, schistosomiasis and echinostomiasis. In Thailand, there is little information on the genetic variation of lymnaeid snails. Thus, this study explores the mitochondrial cytochrome c oxidase subunit I (COI) sequence variation of lymnaeid and physid snails collected from different geographical areas in Thailand, with the main focus on R. rubiginosa. In all, 175 R. rubiginosa, 7 Orientogalba sp., 9 Racesina sp., and 61 Physella acuta were collected from 36 localities in Thailand. A high level of genetic variation was detected in R. rubiginosa, with 40 haplotypes being recorded. Phylogenetic analyses revealed two clades (possibly species) in the material identified as R. rubiginosa. One clade contained all samples examined in this study, together with a sequence from Indonesia, while the second clade comprised specimens found in Singapore, Malaysia, and Vietnam. Seven haplotypes of P. acuta were clustered into clade A, the globally invasive lineage of this species.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136293444","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 : 2023-09-19DOI: 10.1080/13235818.2023.2258421
Konstantinos Apostolou, Dimitrios Klaoudatos, Alexandra Staikou, Smaragda Sotiraki, Marianthi Hatziioannou
ABSTRACTThe production performance of two heliciculture farming systems (open field and net-covered greenhouse) and two densities per production cycle (125 and 250 snails m−2) of the main land snail bred in Greece (Cornu aspersum maximum), was compared using breeding indicators and evaluation of the commercial product. Over 50% of the snails in all treatments reached adulthood in 45 days with most snails reaching maturity (95% on average) by the end of the experiment (56 days) irrespective of the farming density. Mortality rate and nematode egg counts (EPG) were relatively low in both farming systems indicating optimal (density and environmental) farming conditions. Open field treatments resulted in heavier snails and higher weight gain at the end of the experiment compared to the greenhouse treatments. Snail fillet mass exhibited lowest values in the open high-density field and highest in the low-density net-covered greenhouse treatment. Τhe combination of low density with net-covered greenhouse yielded the best results for the highest snail fillet mass. The results of the present study could assist snail farmers adopt suitable breeding methods leading to increased production and better-quality commercial products with lower mortality and improved welfare.KEYWORDS: Land snailCornu aspersum maximumsnail fillet masswelfare AcknowledgementsThis research was co-financed by Greece and the European Union (European Social Fund, ESF) through the Operational Programme ‘Human Resources Development, Education and Lifelong Learning’ in the context of the project ‘Strengthening Human Resources Research Potential via Doctorate Research’ (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ). We would like to thank the reviewers for taking the necessary time and effort to review the manuscript. We sincerely appreciate all the valuable comments and suggestions, which helped us to improve the quality of the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Conflicts of interestThe authors declare no conflicts of interest.Additional informationFundingThis work was supported by State Scholarships Foundation: [Grant Number MIS-5000432].
{"title":"Evaluation of production performance between two heliciculture farming systems","authors":"Konstantinos Apostolou, Dimitrios Klaoudatos, Alexandra Staikou, Smaragda Sotiraki, Marianthi Hatziioannou","doi":"10.1080/13235818.2023.2258421","DOIUrl":"https://doi.org/10.1080/13235818.2023.2258421","url":null,"abstract":"ABSTRACTThe production performance of two heliciculture farming systems (open field and net-covered greenhouse) and two densities per production cycle (125 and 250 snails m−2) of the main land snail bred in Greece (Cornu aspersum maximum), was compared using breeding indicators and evaluation of the commercial product. Over 50% of the snails in all treatments reached adulthood in 45 days with most snails reaching maturity (95% on average) by the end of the experiment (56 days) irrespective of the farming density. Mortality rate and nematode egg counts (EPG) were relatively low in both farming systems indicating optimal (density and environmental) farming conditions. Open field treatments resulted in heavier snails and higher weight gain at the end of the experiment compared to the greenhouse treatments. Snail fillet mass exhibited lowest values in the open high-density field and highest in the low-density net-covered greenhouse treatment. Τhe combination of low density with net-covered greenhouse yielded the best results for the highest snail fillet mass. The results of the present study could assist snail farmers adopt suitable breeding methods leading to increased production and better-quality commercial products with lower mortality and improved welfare.KEYWORDS: Land snailCornu aspersum maximumsnail fillet masswelfare AcknowledgementsThis research was co-financed by Greece and the European Union (European Social Fund, ESF) through the Operational Programme ‘Human Resources Development, Education and Lifelong Learning’ in the context of the project ‘Strengthening Human Resources Research Potential via Doctorate Research’ (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ). We would like to thank the reviewers for taking the necessary time and effort to review the manuscript. We sincerely appreciate all the valuable comments and suggestions, which helped us to improve the quality of the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Conflicts of interestThe authors declare no conflicts of interest.Additional informationFundingThis work was supported by State Scholarships Foundation: [Grant Number MIS-5000432].","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135060558","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}
ABSTRACTA new camaenid land snail species: Coccoglypta limenghuai Chen, Xie, Dai & Wu, n. sp. is described from Yaan City, Sichuan Province, China based on morphology and phylogenetic analysis. Coccoglypta ellenstrongae Thach & Huber, 2021 is treated as a junior synonym of Acusta toyenmongaiensis Rolle, 1911. Coccoglypta limenghuai is morphologically different from the congeneric species by the depressed conical shell, strongly keeled and almost flat whorls and a shallow groove-like depression below the keel of the body whorl. The habitat of the species has been severely damaged and it survives only within an area of a few hundred square metres. Further attention and protection should be given to it in the future.urn:lsid:zoobank.org:pub:DC52A2B4-096C-4CC8-B986-29C789696F3C.KEYWORDS: Conchologyland snailsphylogenetic analysisSichuan Provincetaxonomy AcknowledgementsWe thank Mr Menghua Li (Sichuan Agricultural University) and Mr Jinsheng Mou (Sichuan Agricultural University) for assistance in collecting specimens and providing type specimens; Mr Zhengping Liu (Chengdu) for providing specimens of Coccoglypta pinchoniana and comments on the species identification; Dr Shijun Yang (Sichuan Agricultural University) for assistance in photo editing; Dr Frank Köhler (Australian Museum), Dr Barna Páll-Gergely (Plant Protection Institute, Hungary), Dr Sakboworn Tumpeesuwan (Mahasarakham University) and Dr Chung-Chi Hwang (National University of Kaohsiung) for their helpful comments on the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by National Natural Science Foundation of China [grant number 31772412, 32360132].
基于形态和系统发育分析，报道了四川雅安市陆地蜗牛新种Coccoglypta limenghuai Chen, Xie, Dai & Wu, n. sp.。Coccoglypta ellenstrongae Thach & Huber, 2021被视为Acusta toyenmongaiensis Rolle, 1911的初级同义词。在形态上与同属种的不同之处在于:锥壳凹陷，螺轮龙骨结实，几乎扁平，螺轮龙骨以下有浅凹槽状凹陷。该物种的栖息地已被严重破坏，它只能在几百平方米的面积内生存。关键词:螺壳类陆生蜗牛系统发育分析四川省分类学感谢李梦华先生(四川农业大学)和Mou金生先生(四川农业大学)在标本采集和模式标本提供方面的协助;刘正平先生(成都)提供pinchoniana Coccoglypta标本并就物种鉴定发表意见;杨世军博士(四川农业大学)协助编辑图片;Frank博士Köhler(澳大利亚博物馆)，Barna博士Páll-Gergely(匈牙利植物保护研究所)，Sakboworn Tumpeesuwan博士(Mahasarakham大学)和Chung-Chi Hwang博士(高雄国立大学)对手稿的有益评论。披露声明作者未报告潜在的利益冲突。本研究受国家自然科学基金资助[批准号:31772412,32360132]。
{"title":"A new species of <i>Coccoglypta</i> Pilsbry, 1895 from China (Gastropoda, Camaenidae)","authors":"Zhong-Guang Chen, Guang-Long Xie, Yu-Ting Dai, Shan Ouyang, Xiao-Ping Wu","doi":"10.1080/13235818.2023.2253138","DOIUrl":"https://doi.org/10.1080/13235818.2023.2253138","url":null,"abstract":"ABSTRACTA new camaenid land snail species: Coccoglypta limenghuai Chen, Xie, Dai & Wu, n. sp. is described from Yaan City, Sichuan Province, China based on morphology and phylogenetic analysis. Coccoglypta ellenstrongae Thach & Huber, 2021 is treated as a junior synonym of Acusta toyenmongaiensis Rolle, 1911. Coccoglypta limenghuai is morphologically different from the congeneric species by the depressed conical shell, strongly keeled and almost flat whorls and a shallow groove-like depression below the keel of the body whorl. The habitat of the species has been severely damaged and it survives only within an area of a few hundred square metres. Further attention and protection should be given to it in the future.urn:lsid:zoobank.org:pub:DC52A2B4-096C-4CC8-B986-29C789696F3C.KEYWORDS: Conchologyland snailsphylogenetic analysisSichuan Provincetaxonomy AcknowledgementsWe thank Mr Menghua Li (Sichuan Agricultural University) and Mr Jinsheng Mou (Sichuan Agricultural University) for assistance in collecting specimens and providing type specimens; Mr Zhengping Liu (Chengdu) for providing specimens of Coccoglypta pinchoniana and comments on the species identification; Dr Shijun Yang (Sichuan Agricultural University) for assistance in photo editing; Dr Frank Köhler (Australian Museum), Dr Barna Páll-Gergely (Plant Protection Institute, Hungary), Dr Sakboworn Tumpeesuwan (Mahasarakham University) and Dr Chung-Chi Hwang (National University of Kaohsiung) for their helpful comments on the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by National Natural Science Foundation of China [grant number 31772412, 32360132].","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135781249","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 : 2023-09-01DOI: 10.1080/13235818.2023.2248571
Esin Özçiçek, Filiz Kutluyer Kocabaş, Mehmet Kocabaş, Ökkeş Yilmaz
ABSTRACT The freshwater snail, Viviparus contectus, is an important shellfish owing to its nutritional composition (i.e., high amounts of protein, essential amino acids, fatty acid profile and minerals) and its promise as a candidate for the treatment of some diseases in traditional medicine. Hence, the seasonal changes in the fatty acid (FA) profile of Viviparus contectus caught from Demirköprü Dam Lake were determined in this study. Saturated fatty acid (SFAs) (64.54–80.39% of total fatty acids) had the highest concentration followed by polyunsaturated fatty acids (PUFAs) (10.63–21.83%) and monounsaturated fatty acids (MUFAs) (6.57–10.13%). Stearic acid (C18:0) was the major SFA while arachidonic acid (C20:4 n−6) was the major PUFA. The season significantly affected the FA profile of V. contectus while no significant difference was determined between seasons with respect to tissue MUFAs levels. A higher level of total SFAs was detected during spring (80.39%) while a higher proportion of MUFAs was detected during the winter (10.13%). The total amounts of PUFAs were highest in winter (21.83%). Overall, V. contectus has nutritional value. However, V. contectus caught in autumn may be nutritionally the most valuable for human consumption due to higher eicosapentaenoic acid 20:5 n−3 and docosahexaenoic acid contents.
{"title":"Seasonal changes in fatty acid profile of the freshwater snail Viviparus contectus (Millet, 1813) from lake habitat","authors":"Esin Özçiçek, Filiz Kutluyer Kocabaş, Mehmet Kocabaş, Ökkeş Yilmaz","doi":"10.1080/13235818.2023.2248571","DOIUrl":"https://doi.org/10.1080/13235818.2023.2248571","url":null,"abstract":"ABSTRACT The freshwater snail, Viviparus contectus, is an important shellfish owing to its nutritional composition (i.e., high amounts of protein, essential amino acids, fatty acid profile and minerals) and its promise as a candidate for the treatment of some diseases in traditional medicine. Hence, the seasonal changes in the fatty acid (FA) profile of Viviparus contectus caught from Demirköprü Dam Lake were determined in this study. Saturated fatty acid (SFAs) (64.54–80.39% of total fatty acids) had the highest concentration followed by polyunsaturated fatty acids (PUFAs) (10.63–21.83%) and monounsaturated fatty acids (MUFAs) (6.57–10.13%). Stearic acid (C18:0) was the major SFA while arachidonic acid (C20:4 n−6) was the major PUFA. The season significantly affected the FA profile of V. contectus while no significant difference was determined between seasons with respect to tissue MUFAs levels. A higher level of total SFAs was detected during spring (80.39%) while a higher proportion of MUFAs was detected during the winter (10.13%). The total amounts of PUFAs were highest in winter (21.83%). Overall, V. contectus has nutritional value. However, V. contectus caught in autumn may be nutritionally the most valuable for human consumption due to higher eicosapentaenoic acid 20:5 n−3 and docosahexaenoic acid contents.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49636667","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 : 2023-07-20DOI: 10.1080/13235818.2023.2232534
Tristan Joseph Verhoeff
ABSTRACT New deep-sea finned octopods (Octopoda: Cirrata) in the genera Stauroteuthis and Cirrothauma (Cirroteuthidae) are reported from Australian waters. One new species of Stauroteuthis, S. kengrahami n. sp., is reported from southeastern Australia, a second, S. ?gilchristi from off Macquarie Island, and one specimen collected from off Heard Island is provisionally referred to Cirrothauma magna. A single female Luteuthis dentatus (Grimpoteuthididae) is also reported from Macquarie Island, and additional specimens of Grimpoteuthis greeni are reported from the Great Australian Bight. These new records and new species increase the diversity of Australian cirrate octopuses from six to 10 species, covering all recognised cirrate genera excepting Cryptoteuthis, and emphasise how much remains to be learned regarding Australia’s deep-sea cephalopods.
{"title":"A new species of Stauroteuthis (Octopoda: Cirrata) and further novel cirrate octopods from Australian waters","authors":"Tristan Joseph Verhoeff","doi":"10.1080/13235818.2023.2232534","DOIUrl":"https://doi.org/10.1080/13235818.2023.2232534","url":null,"abstract":"ABSTRACT New deep-sea finned octopods (Octopoda: Cirrata) in the genera Stauroteuthis and Cirrothauma (Cirroteuthidae) are reported from Australian waters. One new species of Stauroteuthis, S. kengrahami n. sp., is reported from southeastern Australia, a second, S. ?gilchristi from off Macquarie Island, and one specimen collected from off Heard Island is provisionally referred to Cirrothauma magna. A single female Luteuthis dentatus (Grimpoteuthididae) is also reported from Macquarie Island, and additional specimens of Grimpoteuthis greeni are reported from the Great Australian Bight. These new records and new species increase the diversity of Australian cirrate octopuses from six to 10 species, covering all recognised cirrate genera excepting Cryptoteuthis, and emphasise how much remains to be learned regarding Australia’s deep-sea cephalopods.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"1 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42481514","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 : 2023-07-18DOI: 10.1080/13235818.2023.2232590
Le-Jia Zhang, Xiao-dong Wang
ABSTRACT An extinct freshwater molluscan fauna has been discovered from Quaternary lacustrine deposits of a recently vanished group of lakes and surrounding lacustrine deposits in the Luliang Basin, Yunnan Province, China. Three species of Tchangmargarya He, 2013 are dominant and distributed sympatrically here. One of them is new to science. Here we describe the three Tchangmargarya species from the Luliang Basin, including the new species, Tchangmargarya cuan n. sp., and compare the species composition of this fauna with the other extant lacustrine mollusc fauna of Yunnan. The vanished lakes group in Luliang is the first case of sympatric distribution within Tchangmargarya. It is considered to have once been a diversity hotspot of Tchangmargarya and represents a vanished Quaternary lacustrine habitat in Yunnan.
{"title":"An extinct species of Tchangmargarya (Gastropoda: Viviparidae) from quaternary lacustrine deposits of a group of vanished lakes in Yunnan, China","authors":"Le-Jia Zhang, Xiao-dong Wang","doi":"10.1080/13235818.2023.2232590","DOIUrl":"https://doi.org/10.1080/13235818.2023.2232590","url":null,"abstract":"ABSTRACT An extinct freshwater molluscan fauna has been discovered from Quaternary lacustrine deposits of a recently vanished group of lakes and surrounding lacustrine deposits in the Luliang Basin, Yunnan Province, China. Three species of Tchangmargarya He, 2013 are dominant and distributed sympatrically here. One of them is new to science. Here we describe the three Tchangmargarya species from the Luliang Basin, including the new species, Tchangmargarya cuan n. sp., and compare the species composition of this fauna with the other extant lacustrine mollusc fauna of Yunnan. The vanished lakes group in Luliang is the first case of sympatric distribution within Tchangmargarya. It is considered to have once been a diversity hotspot of Tchangmargarya and represents a vanished Quaternary lacustrine habitat in Yunnan.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44713142","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 : 2023-07-13DOI: 10.1080/13235818.2023.2233121
İhsan Ekin, R. Şeşen
ABSTRACT This study presents new insights into the near-threatened endemic microsnail Sheitanok amidicus (Schütt & Şeşen, 1991), shedding light on its distribution and morphological characteristics, which have never been documented alive. Surveys conducted in 2023 uncovered two previously unknown localities where the species thrives: stenothermic springs in Tavşantepe village and a private farm in Diyarbakır, Turkey. The snail has whitish-grey body tissue, tentacles with an average length of 0.3 mm, and a foot extending up to 2 mm with grey dots on the upper part. The oval-shaped operculum has an average height and width of 0.4 and 0.3 mm, respectively. The shell width and height is 1.0 mm and 0.7 mm, respectively. The snail has unique features including an orange operculum, heart-shaped blackish mouth parts and two blackish eyes at the base of its tentacles. Previously, the species was known to inhabit seven locations in Southeast Turkey. Its near-threatened status on the IUCN Red List highlights the urgency of conservation efforts. The identification of these new locations provides hope for reducing the risk of extinction for S. amidicus. Additionally, describing the snail's external characteristics would aid in systematic classification of newly found species within this monotypic genus.
{"title":"First live imagery, morphological insights, and new locations of the near-threatened endemic microsnail Sheitanok amidicus (Caenogastropoda: Hydrobiidae) from southeast Turkey","authors":"İhsan Ekin, R. Şeşen","doi":"10.1080/13235818.2023.2233121","DOIUrl":"https://doi.org/10.1080/13235818.2023.2233121","url":null,"abstract":"ABSTRACT\u0000 This study presents new insights into the near-threatened endemic microsnail Sheitanok amidicus (Schütt & Şeşen, 1991), shedding light on its distribution and morphological characteristics, which have never been documented alive. Surveys conducted in 2023 uncovered two previously unknown localities where the species thrives: stenothermic springs in Tavşantepe village and a private farm in Diyarbakır, Turkey. The snail has whitish-grey body tissue, tentacles with an average length of 0.3 mm, and a foot extending up to 2 mm with grey dots on the upper part. The oval-shaped operculum has an average height and width of 0.4 and 0.3 mm, respectively. The shell width and height is 1.0 mm and 0.7 mm, respectively. The snail has unique features including an orange operculum, heart-shaped blackish mouth parts and two blackish eyes at the base of its tentacles. Previously, the species was known to inhabit seven locations in Southeast Turkey. Its near-threatened status on the IUCN Red List highlights the urgency of conservation efforts. The identification of these new locations provides hope for reducing the risk of extinction for S. amidicus. Additionally, describing the snail's external characteristics would aid in systematic classification of newly found species within this monotypic genus.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46883485","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 : 2023-04-03DOI: 10.1080/13235818.2023.2203075
M. Klunzinger
ABSTRACT Larvae (glochidia) of the freshwater mussel, Westralunio albertisi were obtained from the marsupia of a preserved female at the Western Australian Museum. Glochidial shells of W. albertisi are subtriangular and scalene in shape outline with a convoluted surface dotted with pores and have a protruding ventral apex. Glochidial shells (n = 60) measured 260.0 μm long (L) (±1.11 SE), 233.1 μm high (H) (± 1.32 SE), with a size of 246.6 μm (± 0.99 SE), hinge length (Hg) of 183.6 μm (± 0.99 SE), larval tooth length (LTL) of 53.6 μm (± 0.84 SE) and angle of obliquity (Á) of 12.9° (± 0.28 SE). Larval teeth are singular in each valve, lack microstylets, have convex or concave basal protuberances on opposing valves and terminate as blunt outward facing spoon-like to peg-like cusps. In comparison to Westralunio carteri, W. albertisi is smaller (d.f., 178; P < 0.001) for L (t = 33.85), H (t = 12.80), Size (t = 28.98), Hg (t = 21.32), H/L (t = −15.06) and Hg/L (t = −4.21). Westralunio albertisi also has a more acute Á than W. carteri (d.f., 71; t, 10.17; P < 0.001), but displays no difference in LTL (d.f., 6; t, 0.16, P = 0.44).
{"title":"Description of the glochidia of Westralunio albertisi Clench, 1957 (Bivalvia: Unionida: Hyriidae) from the Fly River system, Papua New Guinea","authors":"M. Klunzinger","doi":"10.1080/13235818.2023.2203075","DOIUrl":"https://doi.org/10.1080/13235818.2023.2203075","url":null,"abstract":"ABSTRACT Larvae (glochidia) of the freshwater mussel, Westralunio albertisi were obtained from the marsupia of a preserved female at the Western Australian Museum. Glochidial shells of W. albertisi are subtriangular and scalene in shape outline with a convoluted surface dotted with pores and have a protruding ventral apex. Glochidial shells (n = 60) measured 260.0 μm long (L) (±1.11 SE), 233.1 μm high (H) (± 1.32 SE), with a size of 246.6 μm (± 0.99 SE), hinge length (Hg) of 183.6 μm (± 0.99 SE), larval tooth length (LTL) of 53.6 μm (± 0.84 SE) and angle of obliquity (Á) of 12.9° (± 0.28 SE). Larval teeth are singular in each valve, lack microstylets, have convex or concave basal protuberances on opposing valves and terminate as blunt outward facing spoon-like to peg-like cusps. In comparison to Westralunio carteri, W. albertisi is smaller (d.f., 178; P < 0.001) for L (t = 33.85), H (t = 12.80), Size (t = 28.98), Hg (t = 21.32), H/L (t = −15.06) and Hg/L (t = −4.21). Westralunio albertisi also has a more acute Á than W. carteri (d.f., 71; t, 10.17; P < 0.001), but displays no difference in LTL (d.f., 6; t, 0.16, P = 0.44).","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"96 - 100"},"PeriodicalIF":1.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41713378","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 : 2023-04-03DOI: 10.1080/13235818.2023.2217531
Sung-Jong Cho, Jeonghee Lee, I. Yang, Jinsoon Park
ABSTRACT This study represents the first molecular analysis of Japeuthria ferrea specimens from Korea, focusing on COI and H3 gene regions for species identification and phylogenetic analysis. A total of 13 samples was collected from three different locations along the south coast of Korea, and their sequences were registered in the NCBI GenBank. The COI and H3 gene regions were successfully amplified and bidirectionally sequenced, providing a valuable reference for future DNA barcoding studies. Phylogenetic analysis based on both COI and H3 sequences demonstrated that the Korean and Japanese J. ferrea populations lacked clear regional differentiation. Despite the limitations in differentiating the regional characteristics of J. ferrea, the study confirms the applicability of COI and H3 genes for accurate species identification. The findings emphasise the importance of employing multiple molecular markers for comprehensive DNA analysis to improve species identification accuracy and to minimise misidentification. Further investigation involving expanded sampling and additional DNA regions is required to elucidate the phylogenetic relationships and distribution of J. ferrea.
{"title":"Molecular identification of Japeuthria ferrea from the south coast of Korea","authors":"Sung-Jong Cho, Jeonghee Lee, I. Yang, Jinsoon Park","doi":"10.1080/13235818.2023.2217531","DOIUrl":"https://doi.org/10.1080/13235818.2023.2217531","url":null,"abstract":"ABSTRACT This study represents the first molecular analysis of Japeuthria ferrea specimens from Korea, focusing on COI and H3 gene regions for species identification and phylogenetic analysis. A total of 13 samples was collected from three different locations along the south coast of Korea, and their sequences were registered in the NCBI GenBank. The COI and H3 gene regions were successfully amplified and bidirectionally sequenced, providing a valuable reference for future DNA barcoding studies. Phylogenetic analysis based on both COI and H3 sequences demonstrated that the Korean and Japanese J. ferrea populations lacked clear regional differentiation. Despite the limitations in differentiating the regional characteristics of J. ferrea, the study confirms the applicability of COI and H3 genes for accurate species identification. The findings emphasise the importance of employing multiple molecular markers for comprehensive DNA analysis to improve species identification accuracy and to minimise misidentification. Further investigation involving expanded sampling and additional DNA regions is required to elucidate the phylogenetic relationships and distribution of J. ferrea.","PeriodicalId":18857,"journal":{"name":"Molluscan Research","volume":"43 1","pages":"130 - 137"},"PeriodicalIF":1.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43330522","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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