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Ontogeny and phylogeny of the yolk extension in embryonic Cypriniform fishes by Valerie Christine Virta; Mark Scott Cooper is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

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## Abstract The validity of defining a common phylotypic stage for all vertebrates has been questioned because of variations in embryonic morphological traits between vertebrate classes, as well as variations in embryonic phenotypes between species of the same vertebrate class. To evaluate the evolutionary lability of phylotypic features in vertebrate embryos, we have examined the phylogenetic and ontogenetic origins of the __yolk extension__—a distinctive morphological trait that is found in the ventrolateral trunk region of cypriniform fish embryos. This posterior axial protrusion, extending from the embryonic yolk ball, is formed in cypriniform fishes by a ventrolateral constriction of the yolk mass during the phylotypic period of development. Using a functional definition of the phylotypic period, a comparative analysis of published literature on developing actinoptyerygian (ray‐finned) fishes reveals that the yolk extension is a shared embryonic trait of the clade Cypriniformes. The yolk extension also appears in several species in two other basal teleostean clades, Characiformes and Anguilliformes. The conservation of the yolk extension in the clade Cypriniformes, as well as

Who reads Ontogeny and phylogeny of the yolk extension in embryonic Cypriniform fishes?

Author

Valerie Christine Virta; Mark Scott Cooper

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1552-5007)

Published

2009

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)