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Establishment of the novel bivalve body plan through modification of early developmental events in mollusks
Author(s) -
Wada Hiroshi,
Phuangphong Supanat,
Hashimoto Naoki,
Nagai Kiyohito
Publication year - 2020
Publication title -
evolution and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 78
eISSN - 1525-142X
pISSN - 1520-541X
DOI - 10.1111/ede.12334
Subject(s) - body plan , biology , evolutionary biology , shell (structure) , evolutionary developmental biology , developmental biology , morphology (biology) , lineage (genetic) , zoology , process (computing) , anatomy , ecology , embryo , fishery , microbiology and biotechnology , genetics , engineering , civil engineering , gene , computer science , operating system
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.