Serial Homology and Segment Identity in the Arthropod Head

IF 2.2 4区 生物学 Q2 BIOLOGY
O. Lev, G. Edgecombe, A. Chipman
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引用次数: 15

Abstract

Synopsis The anterior-most unit of the crown-group arthropod body plan includes three segments, the pre-gnathal segments, that contain three neuromeres that together comprise the brain. Recent work on the development of this anterior region has shown that its three units exhibit many developmental differences to the more posterior segments, to the extent that they should not be considered serial homologs. Building on this revised understanding of the development of the pre-gnathal segments, we suggest a novel scenario for arthropod head evolution. We posit an expansion of an ancestral single-segmented head at the transition from Radiodonta to Deuteropoda in the arthropod stem group. The expanded head subdivided into three segmental units, each maintaining some of the structures of the ancestral head. This scenario is consistent with what we know of head evolution from the fossil record and helps reconcile some of the debates about early arthropod evolution.
节肢动物头部的序列同源性和节段同一性
摘要冠群节肢动物身体平面图的最前面单元包括三个节段,即颚前节段,它们包含三个神经细胞,共同组成大脑。最近对该前部区域发育的研究表明,其三个单元与更后部的节段表现出许多发育差异,以至于它们不应被视为序列同源物。基于对颚前节发育的这一修订理解,我们提出了节肢动物头部进化的新场景。我们认为,在节肢动物茎群中,祖先的单节头部在从桡足目到申足目的过渡时期发生了扩张。扩展的头部被细分为三个节段单元,每个节段单元都保持着祖先头部的一些结构。这种情况与我们从化石记录中了解到的头部进化相一致,有助于调和关于早期节肢动物进化的一些争论。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.70
自引率
6.70%
发文量
48
审稿时长
20 weeks
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