科研之友
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摘要
The paradox of deuterostome body plans is that genome analyses indicate deuterostomes are a group with strong kinship, yet they are an assemblage with what appear to be distinctly different body plans. The two major deuterostome groups, chordates and ambulacraria, are allied by features of their anatomy that do not include the nervous systems. Here I review data emerging from neuroanatomical studies that indicate echinoderms and hemichordates have two distinct parts to their nervous systems. In this brief perspective, I propose the hypothesis that in the ambulacraria the two parts are separated spatially and temporally over life history stages, whereas in chordates the two parts are united in a single central nervous systems. This view provides a means of including neuroanatomy in a common deuterostome body plan.
- 出版日期2011-2
