Malacologia最新文献_第7页

Low Genetic Diversity in a Potential (Glacial) Relict: The Rocky Mountain Capshell, Acroloxus coloradensis (Henderson, 1930) (Gastropoda: Acroloxidae) 潜在(冰川)遗迹的低遗传多样性:落基山盖壳，Acroloxus coloradensis (Henderson, 1930)(腹足目:Acroloxidae)

IF 1.3 4区生物学

Malacologia Pub Date : 2020-09-10 DOI: 10.4002/040.063.0110

Björn Stelbrink, B. K. Ellis, A. Paquet, C. Albrecht

引用次数: 0

Redescription of the Sea Hare Phyllaplysia viridis (Bergh, 1905) (Gastropoda: Heterobranchia: Aplysiida) 海兔Phyllaplysia viridis (Bergh, 1905)的再描述(腹足目:异鳃目:海兔目)

IF 1.3 4区生物学

Malacologia Pub Date : 2020-09-10 DOI: 10.4002/040.063.0102

Matt J Nimbs, N. Wilson, G. Limmon, Stephen D. A. Smith

引用次数: 0

First Record of the Mimic Octopus Thaumoctopus mimicus (Cephalopoda: Octopodidae) from the Arabian Sea: Range Extension and Genotyping 阿拉伯海拟章鱼（头足目：章鱼科）的首次记录：范围扩展和基因分型

IF 1.3 4区生物学

Malacologia Pub Date : 2020-09-10 DOI: 10.4002/040.063.0111

K. K. Sajikumar, R. Jeyabaskaran, C. P. Binesh, Kolliyil Sunilkumar Mohamed

引用次数: 1

Sex Differences in Cold Hardiness and Desiccation Tolerance of Invasive Apple Snails in South China 华南入侵苹果螺抗寒性和干旱性的性别差异

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-29 DOI: 10.4002/040.062.0202

Jing Guo, Wu-Bing Xu, P. Martín, Chunxia Zhang, Jia-En Zhang

{"title":"Sex Differences in Cold Hardiness and Desiccation Tolerance of Invasive Apple Snails in South China","authors":"Jing Guo, Wu-Bing Xu, P. Martín, Chunxia Zhang, Jia-En Zhang","doi":"10.4002/040.062.0202","DOIUrl":"https://doi.org/10.4002/040.062.0202","url":null,"abstract":"ABSTRACT Sex differences in stress responses may be a key factor that determines population structure. Sex ratios of Pomacea canaliculata populations usually average 1:1 at birth, but are often female-biased for adults. Low temperatures and drought are the main abiotic stresses affecting reproductive dispersal and population development. Therefore, we investigated whether Pomacea sp. (mainly P. canaliculata but might include P. maculata) exhibited sex differences in cold hardiness and desiccation tolerance. The results show that more females survived than males during cold-drought stress and overwintering. Following cold-drought stress, 58% of females and 40% of males survived at 3°C drought conditions for 6 days. With the development of cold-drought hardiness, increased amounts of bound water, glycerol and lipids were found in Pomacea sp. along with decreased free water levels. These physiological parameters exhibited sex differences in the snails, except for lipids, and the changes all showed tendencies favoring the survival of females under cold-drought stress. These results suggest that female Pomacea sp. may be more viable than males under cold and dry conditions.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44183156","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}

引用次数: 4

Double Hectocotylization in Hubb's Octopus, Octopus hubbsorum (Cephalopoda: Octopodidae) Hubb’s Octopus，Octopus hubbsorum的双Hetocylization（头足目：章鱼科）

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0207

Mariana Díaz-Santana-Iturrios, Andrés Granados-Amores, D. Palacios-Salgado, J. Granados-Amores

引用次数: 0

The Correlation of Topographically-Derived Relative Wetness with Terrestrial Mollusk Presence and Abundance 地形相对湿度与陆生软体动物存在和丰度的相关性

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0203

M. Emery-Wetherell, C. Mathew, Cameron Church, Ellie Dellard, E. Davis, J. Roering

{"title":"The Correlation of Topographically-Derived Relative Wetness with Terrestrial Mollusk Presence and Abundance","authors":"M. Emery-Wetherell, C. Mathew, Cameron Church, Ellie Dellard, E. Davis, J. Roering","doi":"10.4002/040.062.0203","DOIUrl":"https://doi.org/10.4002/040.062.0203","url":null,"abstract":"ABSTRACT Many species of terrestrial mollusks are small and difficult to find, with poorly known ranges and habitat preferences. Because desiccation is a primary cause of mortality for many terrestrial mollusks, incorporating wetness as a habitat variable may improve survey results for different species. We compared presence and abundance data from terrestrial mollusk surveys in Tillamook Resource Area to two measures of relative wetness: topographic wetness index (TWI) and geomorphic features (landslides, debris-flow channels, etc.). Hurdle Model regression revealed a positive correlation between increased TWI and likelihood of presence or abundance for four species, and a negative correlation for six species. Overall species diversity and total mollusk count were negatively correlated with increased TWI, but the effect size was small (p = 0.02, R2= -0.03). Our Kruskal-Wallis Analysis of Variance of TWI between species was significant (p < 0.001), indicating terrestrial mollusks occupy significantly different wetness regimes – but this relationship was driven entirely by the wetness specialization of Hemphillia glandulosa. Our chi-square analysis of topographic features found significant preferences of different species for different topographic types, which correlated loosely but not precisely to the preferences indicated by TWI. These results show that altering current terrestrial mollusk survey protocol to include geomorphic features, which are simpler and less time-intensive than calculating TWI, would increase detection likelihood of certain species, including Hemphillia glandulosa, a species protected under the Survey and Manage guidelines of the Northwest Forest Plan.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47505806","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}

引用次数: 0

John Clarkson Jay (1808–1891): His Life and Malacological Contributions 约翰·克拉克森-周（1808–1891）：他的生平和马六甲学的贡献

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0206

A. Kabat, E. Coan

引用次数: 0

Status of Rare Endemic Species: Molecular Phylogeny, Distribution and Conservation of Freshwater Molluscs Truncilla macrodon and Truncilla cognata in Texas 珍稀特有物种现状:德克萨斯州淡水软体动物大截尾和同源截尾的分子系统发育、分布和保护

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0210

L. Burlakova, D. Campbell, A. Karatayev

{"title":"Status of Rare Endemic Species: Molecular Phylogeny, Distribution and Conservation of Freshwater Molluscs Truncilla macrodon and Truncilla cognata in Texas","authors":"L. Burlakova, D. Campbell, A. Karatayev","doi":"10.4002/040.062.0210","DOIUrl":"https://doi.org/10.4002/040.062.0210","url":null,"abstract":"ABSTRACT Freshwater bivalves in the family Unionidae are one of the most endangered groups of animals in North America. In Texas, where over 60% of unionids are rare or very rare, 15 species have been added to the state's list of threatened species, and 10 are under consideration for federal listing. Due to insufficient survey efforts in the past decades, however, primary data on current distribution and habitat requirement for most of these rare species are lacking, thus challenging their protection and management. Although the species are listed as valid, there was no genetic confirmation to test for the possibility of ecophenotypes, which complicates conservation efforts. In this paper, we present genetic and distributional data for two rare Texas species, Truncilla macrodon and Truncilla cognata, and we suggest appropriate conservation measures. Tests of genetic affinities of these species using three gene regions, cox1, nad1 and ITS1, supported recognition of T. cognata and T. macrodon as full species. Analysis of historic and current species distribution showed that both these regional endemics are particularly vulnerable, and their distribution range has been reduced in the last 80 years.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42100055","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}

引用次数: 7

A New Species of the Genus Bunnya H. B. Baker, 1942 (Helicoidea) from MÉXico Bunnya H.B.Baker属一新种，1942（Helicoidea），来自墨西哥

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0204

Victoria Araiza-Gómez, Zaidett Barrientos-Llosa, E. A. Ruíz, G. Zúñiga

{"title":"A New Species of the Genus Bunnya H. B. Baker, 1942 (Helicoidea) from MÉXico","authors":"Victoria Araiza-Gómez, Zaidett Barrientos-Llosa, E. A. Ruíz, G. Zúñiga","doi":"10.4002/040.062.0204","DOIUrl":"https://doi.org/10.4002/040.062.0204","url":null,"abstract":"ABSTRACT We describe a new helicoidean semi-slug based on morphological and molecular evidence. The new species belongs to the genus Bunnya and is described from a small agricultural area in Zinacantepec, San Juan de las Huertas, México. The genus Bunnya is externally similar to Xanthonyx, another Helicoidea genus; both genera have similar shell and body form, and both have a tail horn. Internally, Bunnya is similar to Humboldtiana, since both have dart-sacs (3 in Bunnya, 3−4 in Humboldtiana) surrounding the vagina, two dart-bulbs associated with each dart sac, and a gland number similar to the dart-sacs number. Four adult specimens of Bunnya metli n. sp. were dissected and compared with the two described species: B. bernardinae from Cuajimalpa, México City, and B. naranjoe from Sierra de Manantlan, Jalisco. Bunnya metli n. sp. is characterized by: very closely-spaced radial riblets (about 23 per mm) crossed by fine spiral wavy threads on the embryonic whorls; unfused glands inserted on the vagina above the dart-sacs and only one dart per sac; a short, swollen penis with a large spherical verge about half the penis size; an elongated bursa copulatrix with a slight constriction in the middle; a long bursa copulatrix duct; and dart sacs with a muscular pad within the vaginal lumen, surrounding the basal part of the genitalia. We performed a phylogenetic analyses using data from fragments of 16S rRNA mtDNA and 28S rRNA genes from one of the collected specimens, as well as other helicoidean sequences from GenBank. Our analyses support the membership of Bunnya metli n. sp. in Xanthonychidae. This suggests that the taxonomic position of Bunnya in Humboldtianidae or Xanthonychidae warrants reevaluation.","PeriodicalId":49895,"journal":{"name":"Malacologia","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45910125","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}

引用次数: 1

Candidate Calcium-Binding Genes for Chemical Boring in the Date Mussel Lithophaga lithophaga 枣贻贝化学钻孔候选钙结合基因研究

IF 1.3 4区生物学

Malacologia Pub Date : 2019-03-01 DOI: 10.4002/040.062.0208

U. Sivka

引用次数: 1