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首页> 外文期刊>Journal of Systematic Palaeontology >Two new Silurian species of eurypterus (chelicerata: Eurypterida) from Norway and Canada and the phylogeny of the genus
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Two new Silurian species of eurypterus (chelicerata: Eurypterida) from Norway and Canada and the phylogeny of the genus

机译：来自挪威和加拿大的两种志留纪的eurypterus属（chelicerata：Eurypterida）和属的系统发育

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摘要

A new species of Eurypterus from the Wenlock of Ringerike, Norway is described as E. hankeni sp. nov., based on fine pustular ornament on the carapace and opisthosoma, an enlarged distal podomere of the swimming leg and long angular epimera on the pretelson. Eurypterus species are reviewed: the oldest species, E. minor Laurie, 1898 from the Llandovery of the Pentland Hills in Scotland is redescribed and diagnosed as having eyes with large palpebral lobes, posterior second order opisthosomal differentiation, a coarse pustular ornament on both carapace and tergites and lacking the rows of raised scales found in other representatives of the genus. Material described previously and left in open nomenclature from the Late Ludlow of Somerset Island, Canada, is here named E leopoldi sp. nov. It is relatively similar to E. pittsfordensis, but differs in the rhombiovate outline of the metastoma. An overview of morphological features carrying phylogenetic information in Eurypterus is provided. A phylogenetic analysis indicates that the eartier-used genus, Baltoeurypterus Stormer, 1973, is not monophyletic and even use of the name for its type species only (and its sister taxon) will render Eurypterus paraphyletic, unless assigning most terminals to new genera. This is not considered appropriate and the genus name Eurypterus is here proposed for use for all species, including the three previously assigned to Baltoeurypterus.
机译：来自挪威Ringerike的Wenlock的Eurypterus的新物种被描述为E. hankeni sp.。十一月，基于甲壳和腹膜上的脓疱状装饰物，游泳腿的远端足突和视锥虫上的长角Epimera。回顾了Eurypterus物种：对最古老的物种，来自苏格兰Pentland Hills Llandovery的E. minor Laurie，1898年进行了重新描述，并诊断为眼睛具有大的睑裂，后二阶阿胶体细胞分化，甲壳和甲壳上的粗糙脓疱装饰象鼻虫，缺乏在该属的其他代表中发现的鳞片状的行。先前描述并从加拿大萨默塞特岛晚卢德洛（Lard Ludlow）命名的材料在此命名为E leopoldi sp。十一月它与大肠杆菌（E. pittsfordensis）相对相似，但在转移灶的菱形轮廓上有所不同。提供了携带Eurypterus系统发育信息的形态特征的概述。系统发育分析表明，最早使用的属Baltoeurypterus Stormer，1973年不是单系的，甚至仅使用其类型物种的名称（及其姊妹分类群）将使Eurypterus成为共生的，除非将大多数末端分配给新属。这被认为是不合适的，在此提议将Eurypterus属名称用于所有物种，包括先前分配给Baltoeurypterus的三个物种。

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