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Development of oral and branchial muscles in lancelet larvae of Branchiostoma japonicum
Author(s) -
Yasui Kinya,
Kaji Takao,
Morov Arseniy R.,
Yonemura Shigenobu
Publication year - 2014
Publication title -
journal of morphology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 74
eISSN - 1097-4687
pISSN - 0362-2525
DOI - 10.1002/jmor.20261
Subject(s) - biology , anatomy , larva , metamorphosis , gill , neural crest , pharynx , viral tegument , zoology , fish <actinopterygii> , microbiology and biotechnology , ecology , embryo , fishery , virology
Cover illustration . Four larval stages of Branchiostoma japonicum in phase contrast microscopy. In this issue of the Journal of Morphology, Yasui and coauthors (pp. 465–477 ) analyze the dynamic remodeling of pharynx of Branchiostoma japonicum during metamorphosis. They show that the lancelet orobranchial musculature is apparently a larval adaptation to prevent harmful intake. However, vestigial muscles appeared transiently with the secondary gill formation suggesting a bilateral ancestral state of muscular gills, and a segmental pattern of developing branchial muscles without neural crest and placodal contributions is suggestive of a precursor of vertebrate branchiomeric pattern.