{"title":"Never ending diversity: two new species of the genus <i>Allocreadium</i> (Digenea: Allocreadiidae) including new keys to the genus.","authors":"K S Vainutis","doi":"10.1017/S0022149X24000440","DOIUrl":null,"url":null,"abstract":"<p><p>Two new species of the genus <i>Allocreadium</i> were isolated from the intestines of the Lake minnow <i>Rhynchocypris percnura</i> caught in the backwater of the Komissarovka River in the South of the Russian Far East. The morphology of <i>A. anastasii</i> n. sp. corresponds to that of <i>Allocreadium</i> sp. from Lake Khar (Mongolia) and <i>Allocreadium</i> sp. Belous, 1952 from the Primorsky region of Russia except for the preacetabular anterior border of the vitelline follicles in <i>A. anastasii</i> n. sp. from the Komissarovka River vs. at anterior half of ventral sucker in <i>Allocreadium</i> sp. Genetic analysis revealed the identity of <i>A. anastasii</i> n. sp. to <i>Allocreadium</i> sp. 1 from the Nezhinka River and Lake Khar. <i>Allocreadium macrolecithum</i> n. sp. was differentiated from Palaearctic <i>Allocreadium</i> spp. by having the following features: respectively large vitelline follicles extending from posterior extremity to anterior margin of the ventral sucker; relatively short caeca reaching the border of middle and posterior thirds of hindbody; and small testes in the middle of hindbody. Interspecific genetic p-distances between <i>Allocreadium</i> spp. were 0.16-7.23% in 28S gene and 18.62-31.54% in <i>Cox1</i> mtDNA gene. In the phylogenetic tree reconstructed with Maximum parsimony and Bayesian Inference methods, <i>A. anastasii</i> n. sp. and <i>A. macrolecithum</i> n. sp. were nested into different species groups of the genus <i>Allocreadium</i> - sister to <i>A. khankaiense</i> and <i>A. bursense</i>, respectively. Modified dichotomous keys were prepared for 31 Palaearctic species of <i>Allocreadium</i> including <i>A. crassum</i>, <i>A. dogieli</i>, <i>A. papilligerum</i>, <i>A. bursense</i>, <i>A. anastasii</i> n. sp., and <i>A. macrolecithum</i> n. sp.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1017/S0022149X24000440","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
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Abstract
Two new species of the genus Allocreadium were isolated from the intestines of the Lake minnow Rhynchocypris percnura caught in the backwater of the Komissarovka River in the South of the Russian Far East. The morphology of A. anastasii n. sp. corresponds to that of Allocreadium sp. from Lake Khar (Mongolia) and Allocreadium sp. Belous, 1952 from the Primorsky region of Russia except for the preacetabular anterior border of the vitelline follicles in A. anastasii n. sp. from the Komissarovka River vs. at anterior half of ventral sucker in Allocreadium sp. Genetic analysis revealed the identity of A. anastasii n. sp. to Allocreadium sp. 1 from the Nezhinka River and Lake Khar. Allocreadium macrolecithum n. sp. was differentiated from Palaearctic Allocreadium spp. by having the following features: respectively large vitelline follicles extending from posterior extremity to anterior margin of the ventral sucker; relatively short caeca reaching the border of middle and posterior thirds of hindbody; and small testes in the middle of hindbody. Interspecific genetic p-distances between Allocreadium spp. were 0.16-7.23% in 28S gene and 18.62-31.54% in Cox1 mtDNA gene. In the phylogenetic tree reconstructed with Maximum parsimony and Bayesian Inference methods, A. anastasii n. sp. and A. macrolecithum n. sp. were nested into different species groups of the genus Allocreadium - sister to A. khankaiense and A. bursense, respectively. Modified dichotomous keys were prepared for 31 Palaearctic species of Allocreadium including A. crassum, A. dogieli, A. papilligerum, A. bursense, A. anastasii n. sp., and A. macrolecithum n. sp.
从俄罗斯远东地区南部科米萨罗夫卡河（Komissarovka）回流处捕获的湖鲦鱼 Rhynchocypris percnura 的肠道中分离出了两个 Allocreadium 属的新物种。A. anastasii n. sp.的形态与哈尔湖（蒙古）的 Allocreadium sp.遗传分析表明，A. anastasii n. sp.与来自 Nezhinka 河和 Khar 湖的 Allocreadium sp.Allocreadium macrolecithum n. sp.与古北区 Allocreadium spp.的区别在于它们具有以下特征：分别从腹侧吸盘的后端延伸至前缘的大卵黄蓇葖果；相对较短的盲肠到达后体中部和后三分之二的边界；后体中部的睾丸较小。Allocreadium属之间的28S基因种间遗传p-distances为0.16-7.23%，Cox1 mtDNA基因种间遗传p-distances为18.62-31.54%。在用最大解析度法和贝叶斯推断法重建的系统发生树中，A. anastasii n. sp.和 A. macrolecithum n. sp.被嵌套到 Allocreadium 属的不同种群中--分别是 A. khankaiense 和 A. bursense 的姐妹种。为 31 个古北区 Allocreadium 物种编制了修正的二分键，包括 A. crassum、A. dogieli、A. papilligerum、A. bursense、A. anastasii n. sp.和 A. macrolecithum n. sp.。
期刊介绍：
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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