On the Modes of the Formation of the Exoskeleton in Early Jawless Vertebrates (Osteostraci, Agnatha)

On the Modes of the Formation of the Exoskeleton in Early Jawless Vertebrates (Osteostraci, Agnatha) Based on recently obtained original and published data on the fine structure of the external skeleton of osteostracan agnathans (Osteostraci, Agnatha), possible modes of the formation of their hard cover in the course of the horizontal growth of the exoskeleton are characterized. The developmental models for the formation of various configurations of cephalothoracic shields typical for osteostracans are revealed. It is shown that, in the morphogenesis of the hard cover of this group of early vertebrates, a significant part of the variants of the exoskeleton horizontal growth characteristic of early vertebrates are observed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Doklady Biological Sciences Springer Journals

On the Modes of the Formation of the Exoskeleton in Early Jawless Vertebrates (Osteostraci, Agnatha)

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Publisher
Pleiades Publishing
Copyright
Copyright © 2018 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Life Sciences, general; Plant Sciences; Evolutionary Biology
ISSN
0012-4966
eISSN
1608-3105
D.O.I.
10.1134/S0012496618010015
Publisher site
See Article on Publisher Site

Abstract

Based on recently obtained original and published data on the fine structure of the external skeleton of osteostracan agnathans (Osteostraci, Agnatha), possible modes of the formation of their hard cover in the course of the horizontal growth of the exoskeleton are characterized. The developmental models for the formation of various configurations of cephalothoracic shields typical for osteostracans are revealed. It is shown that, in the morphogenesis of the hard cover of this group of early vertebrates, a significant part of the variants of the exoskeleton horizontal growth characteristic of early vertebrates are observed.

Journal

Doklady Biological SciencesSpringer Journals

Published: Mar 13, 2018

References

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