Establishment of the novel bivalve body plan through modification of early developmental events in mollusks,Evolution and Development

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Establishment of the novel bivalve body plan through modification of early developmental events in mollusks
Evolution and Development ( IF 2.6 ) Pub Date : 2020-04-14 , DOI: 10.1111/ede.12334
Hiroshi Wada ₁ , Supanat Phuangphong ₁ , Naoki Hashimoto ₂ , Kiyohito Nagai ₂

Affiliation

Mollusks have a wide variety of body plans, which develop through conserved early embryogenesis, namely spiral embryonic development and trochophore larvae. Although the comparative study of mollusks has attracted the interest of evolutionary developmental biology researchers, less attention has been paid to bivalves. In this review, we focused on the evolutionary process from single‐shell ancestors to bivalves, which possess bilaterally separated shells. Our study tracing the lineage of shell field cells in bivalves did not support the old hypothesis that shell plate morphology is due to modification of the spiral cleavage pattern. Rather, we suggest that modification of the shell field induction process is the key to understanding the evolution of shell morphology. The novel body plan of bivalves cannot be established solely via separating shell plates, but rather requires the formation of additional organs, such as adductor muscles. The evolutionary biology of bivalves offers a unique view on how multiple organs evolve in a coordinated manner to establish a novel body plan.

中文翻译：

通过修改软体动物的早期发育事件建立新的双壳纲人体计划

软体动物有各种各样的身体计划，这些计划是通过保守的早期胚胎发生而发育的，即螺旋胚胎发育和次绒毛幼虫。尽管软体动物的比较研究引起了进化发育生物学研究人员的兴趣，但对双壳类动物的关注却很少。在这篇综述中，我们集中于从单壳祖先到双壳类的进化过程，这些壳具有双向分离的壳。我们的研究追踪双壳类中壳场细胞的谱系的研究不支持壳板形态是由于螺旋分裂模式的改变而引起的旧假说。相反，我们建议修改壳场感应过程是了解壳形态演变的关键。新颖的双壳类动物身体计划不能仅通过分开的壳板来建立，而是需要形成其他器官，例如内收肌。双壳类动物的进化生物学提供了关于多个器官如何以协调方式进化以建立新的身体计划的独特观点。

更新日期：2020-04-14

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