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首页> 外文期刊>Belgian Journal of Zoology >Description of a new genus and two new species of Darwinulidae (Crustacea, Ostracoda), from Christmas Island (Indian Ocean) with some considerations on the morphological evolution of ancient asexuals
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Description of a new genus and two new species of Darwinulidae (Crustacea, Ostracoda), from Christmas Island (Indian Ocean) with some considerations on the morphological evolution of ancient asexuals

机译：描述了来自圣诞岛（印度洋）的一种新的属和两个新的达尔文科（甲壳纲，鸵鸟纲），并考虑了古代无性恋者的形态演变

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Darwinulidae is believed to be one of the few metazoan taxa in which fully asexual reproduction might have persisted for millions of years. Although rare males in a single darwinulid species have recently been found,they may be non-functional atavisms. The representatives of this family are characterized by a slow evolutionary rate,resulting in a conservative morphology in the different lineages over long time frames and across wide geographic ranges. Differences between species and genera,although often based on small details of valve morphology and chaetotaxy,are nevertheless well-recognizable.Five recent genera (Darwinula,Alicenula,Vestalenula,Penthesilenula and Microdarwinula) and about 35 living species,including also those left in open nomenclature, are included in this family.Previous phylogenetic analyses using both morphological characters and molecular data confirmed that the five genera are good phyletic units.Here,we report on the results of a study on darwinulid ostracods from Christmas Island (Indian Ocean).The taxonomic investigation led to the description of a new genus and two new species,namely Isabenula humphreysi gen.nov.sp.nov.and Vestalenula sp.E,this latter being left in open nomenclature,because only one individual was available.A new phylogeny of the family,using 30 morphological characters of 23 described species,is here presented.A key to the genera of Recent Darwinulidae,based on the morphology of valves and soft parts in adult females,is also provided.The discovery of Isabenula gen.nov.,which shares intermediate morphological features with the genera Vestalenula and Penthesilenula,opens new opportunities to critically reconsider previous hypotheses on tempo and mode of evolution in the family Darwinulidae and on the phylogenetic relationships between its representatives.
机译：达尔文科被认为是少数完全无性繁殖可能已经持续了数百万年的后生类群之一。尽管最近发现了单个达尔文氏菌物种中的稀有雄性，但它们可能是无功能的空洞症。该家族的代表以缓慢的进化速率为特征，导致在长期范围内和广泛的地理范围内不同谱系的保守形态。物种和属之间的差异虽然通常基于瓣膜形态和细部植物学的细微差别，但仍可以很好地识别。最近的五个属（Darwinula，Alicenula，Vestalenula，Penthesilenula和Microdarwinula）以及约35个活的物种，也包括那些尚未开放的物种以前使用形态学特征和分子数据进行的系统发育分析均证实这五个属是良好的系统发育单元。在这里，我们报告对圣诞节岛（印度洋）上的达尔文氏梭鱼的研究结果。分类学研究导致描述了一个新属和两个新种，即Isabenula humphreysi gen.nov.sp.nov。和Vestalenula sp.E，后者被保留为开放命名法，因为只有一个人可用。利用23个描述物种的30个形态特征，提出了该科的近缘种。还提供了成年女性的柔软部位。伊莎宾藻属nov.nov。的发现与Vestalenula和Penthesilenula属具有中间形态特征，这为严谨地重新考虑Darwinulidae家族关于速度和进化方式的先前假设提供了新的机会。以及代表之间的系统发育关系。

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