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首页> 外文期刊>Journal of Nematology, with Annual of Applied Nematology >Two androdioecious and one dioecious new species of Pristionchus (Nematoda: Diplogastridae): new reference points for the evolution of reproductive mode.
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Two androdioecious and one dioecious new species of Pristionchus (Nematoda: Diplogastridae): new reference points for the evolution of reproductive mode.

机译：雌雄同体的两个雄雄异体和一个雌雄异体的新物种（线虫：Diplogastridae）：生殖方式进化的新参考点。

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摘要

Rhabditid nematodes are one of a few animal taxa in which androdioecious reproduction, involving hermaphrodites and males, is found. In the genus Pristionchus, several cases of androdioecy are known, including the model species P. pacificus. A comprehensive understanding of the evolution of reproductive mode depends on dense taxon sampling and careful morphological and phylogenetic reconstruction. In this article, two new androdioecious species, P. boliviae n. sp. and P. mayeri n. sp., and one gonochoristic outgroup, P. atlanticus n. sp., are described on morphological, molecular, and biological evidence. Their phylogenetic relationships are inferred from 26 ribosomal protein genes and a partial SSU rRNA gene. Based on current representation, the new androdioecious species are sister taxa, indicating either speciation from an androdioecious ancestor or rapid convergent evolution in closely related species. Male sexual characters distinguish the new species, and new characters for six closely related Pristionchus species are presented. Male papillae are unusually variable in P. boliviae n. sp. and P. mayeri n. sp., consistent with the predictions of "selfing syndrome." Description and phylogeny of new androdioecious species, supported by fuller outgroup representation, establish new reference points for mechanistic studies in the Pristionchus system by expanding its comparative context.
机译：大戟线虫是少数动物类群中的一种，其中发现有雌雄同体的生殖，包括雌雄同体和雄性。在Pristionchus属中，已知有几种雄雄激素的病例，包括模型种P. pacificus。对生殖方式进化的全面理解取决于密集的分类单元采样以及仔细的形态和系统发育重建。在本文中，发现了两个新的雄性物种，P。boliviae n。 sp。和P. mayeri n。 sp。，和一个性行为外群P. atlanticus n.。在形态学，分子学和生物学证据上都有描述。从26个核糖体蛋白基因和部分SSU rRNA基因推断出它们的系统发育关系。根据目前的表象，新的雄雄同性物种是姊妹类群，表明要么是雄雄同系祖先的物种形成，要么是密切相关物种的快速趋同进化。男性性特征区分了新物种，并提出了六个密切相关的Pristionchus物种的新特征。男性乳头在P. boliviae n中异常地可变。 sp。和P. mayeri n。 sp。，与“自私综合症”的预测一致。在更完整的群体代表的支持下，新雄性雄性物种的描述和系统发育，通过扩展其比较背景，为Pristionchus系统的力学研究建立了新的参考点。

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