Citellinema (Nematoda: Heligmosomidae) from North America with descriptions of 2 new species from the red squirrel Tamiasciurus hudsonicus and 1 from the Canadian woodchuck, Marmota monax
Citellinema (Nematoda: Heligmosomidae) from North America with descriptions of 2 new species from the red squirrel Tamiasciurus hudsonicus and 1 from the Canadian woodchuck, Marmota monax
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来自北美的 Citellinema（线虫纲：Heligmosomidae），描述了 2 个来自红松鼠 Tamiasciurus hudsonicus 的新物种和 1 个来自加拿大土拨鼠 Marmota monax 的新物种
DOI：
10.1017/s0031182022000737
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发表时间：
2022
期刊：
影响因子：
2.4
通讯作者：
Jiménez, F. Agustín
中科院分区：
文献类型：
--
作者：
Alnaqeb, Haitham;Galbreath, Kurt E.;Koehler, Anson V.;Campbell, Mariel L.;Jiménez, F. Agustín
Citellinema Hall，1918包括6种有效的松鼠科胃肠道线虫。古北界有2种，新北界有4种，其中3种在科罗拉多、爱达荷州和俄勒冈州的分布最少，1种为二叉Citellinema bifurcatum，在北美广泛分布。该属的成员是双形的，具有头状囊泡，雌性的末端棘状突起，并具有坚固的骨针，由近端融合和半圆柱形轴连接到由2个末端丝状突起支撑的薄层组成。通常，骨针的大小被用来区分物种。作为柏林共同进化计划的一部分，标本暂时被鉴定为C。bifurcatum通过密集的实地采样的哺乳动物和相关的寄生虫跨越泛北极地区的地方收集。这些标本揭示了相当大的遗传变异在线粒体和核基因座，支持深刻分歧的分支的鉴定。对这些新标本的研究，沿着C. bifurcatum和Citellinema quadrivittati的关系表明，Mongolia Citellinema（以前与C. bifurcatum）应该复活和3个额外的物种描述。我们建议，骨针的明显分叉的性质应被认为是一个通用的诊断性状，而相对于骨针的叶片的比例长度被用作一个特定的字符。我们证明了持续库存的关键需要往往鲜为人知的主机和寄生虫的组合，有助于不断增长的基线档案标本，收藏品和信息，使动物区系结构和多样性的探索成为可能。
Citellinema Hall, 1918 includes 6 valid species of gastrointestinal nematodes of sciurids. Two species occur in the Palearctic and 4 in the Nearctic, 3 of which occur minimally across Colorado, Idaho and Oregon and 1, Citellinema bifurcatum, has a wide distribution across North America. Members of the genus are didelphic, possess a cephalic vesicle, a terminal spine-like process in females and feature robust spicules, consisting of a proximal end fused and semicylindrical shaft connected to a lamina supported by 2 terminal filiform processes. Typically, the size of the spicules is used to differentiate species. As part of the Beringian Coevolution Project, specimens provisionally identified as C. bifurcatum were collected through intensive field sampling of mammals and associated parasites from across localities spanning the Holarctic. These specimens revealed considerable genetic variability at both mitochondrial and nuclear loci, supporting the identification of deeply divergent clades. Examination of these new specimens, along with the holotypes of C. bifurcatum and Citellinema quadrivittati indicates that Citellinema monacis (previously synonymized with C. bifurcatum) should be resurrected and 3 additional species described. We suggest that the apparent bifurcated nature of the spicule should be considered a generic diagnostic trait, while the proportional length of the lamina relative to that of the spicule is used as a specific character. We demonstrate the critical need for continued inventory of often poorly known assemblages of hosts and parasites, contributing to a growing baseline of archival specimens, collections and information that make explorations of faunal structure and diversity possible.
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发表时间：
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期刊：
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