Taxonomic reassessment of Tetrapygus niger (Arbacioida, Echinoidea): molecular and morphological evidence support its placement in Arbacia
Taxonomic reassessment of Tetrapygus niger (Arbacioida, Echinoidea): molecular and morphological evidence support its placement in Arbacia
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Tetrapygus niger（Arbacioida、Echinoidea）的分类学重新评估：分子和形态学证据支持其在 Arbacia 中的位置
DOI：
10.11646/zootaxa.5375.2.6
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发表时间：
2023
期刊：
影响因子：
0.9
通讯作者：
DIAZ, ANGIE
中科院分区：
文献类型：
--
作者：
COURVILLE, ERWAN;POULIN, ELIE;SAUCEDE, THOMAS;MOOI, RICH;LESSIOS, HARILAOS;SALINAS, ANDREA MARTÍNEZ;DIAZ, ANGIE
针鼹属（Tetrapygus）最初是由L. Agassiz（1841）在1782年的《黑Molina Tetrapygus》一种的基础上描述的。由于Mortensen（1935）进行了广泛的研究，在过去的一个世纪里，四足龙在分类上得到了有限的关注。最近在智利北部上新世上部发现的Arbacia Gray， 1835化石物种揭示了Arbacia和Tetrapygus两种不同的Arbacia属之间惊人的形态相似性。这些发现迫使新的调查来评估这些属的分类地位。基于分子线粒体（COI）、核（28S）和形态学证据，黑四足虫被恢复为dufresnii Arbacia的姐妹种，这两个物种在南美Arbacia物种的系统发育中形成了一个分支。因此，本文修改了黑四甲的诊断和描述，并将该物种重新归属于Arbacia，正如A. Agassiz在Agassiz & Desor（1846）中提出的那样，以种名Arbacia nigra。根据这些新发现，也提出了一种修正的诊断。
The echinoid genus Tetrapygus was initially described by L. Agassiz (1841) based on a single species, Tetrapygus niger Molina, 1782. Since the extensive work conducted by Mortensen (1935), Tetrapygus has received limited taxonomic attention over the past century. Recent discoveries of new fossil species of Arbacia Gray, 1835 from the upper Pliocene of northern Chile revealed striking morphological similarities between the two distinct Arbaciidae genera Arbacia and Tetrapygus. These findings compelled new investigations to evaluate the taxonomic status of these genera. Based on molecular mitochondrial (COI), nuclear (28S), and morphological evidence, Tetrapygus niger is here recovered as the sister species to Arbacia dufresnii, both species forming a clade within the phylogeny of South American species of Arbacia. Consequently, the diagnosis and description of Tetrapygus niger are here revised, and the species is reattributed to Arbacia, as previously proposed by A. Agassiz in Agassiz & Desor (1846) under the species name Arbacia nigra. An emended diagnosis of Arbacia is also proposed in light of these new findings.