The golden age of comparative morphology: Laser scanning microscopy and neurogenesis in trochophore animals

The golden age of comparative morphology: Laser scanning microscopy and neurogenesis in... Immunochemical labelling of neuronal elements and laser confocal microscopy have considerably expanded the capacity of comparative morphology, and allowed us to study neurogenesis in various trochophore animals at the level of identified neurons. The data obtained have impeached some popular phylogenetic theories. Thus, the comparative study has shown that in the representative Trochozoan species, the orthogonal brain is absent at all developmental stages. Fundamental differences in neurogenesis and neuroarchitecture between trochophores from different taxa suggest that trochophore-like larvae are not homologous, and their likeness is most probably the result of convergence. Our data support the “intercalation hypothesis” of the origin of indirect development with a trochophore-like larva. It seems reasonable to exclude from phylogenetic discussions the orthogon and the trochophore as an ancestral form common for Lophotrochozoa. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Developmental Biology Springer Journals

The golden age of comparative morphology: Laser scanning microscopy and neurogenesis in trochophore animals

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2010 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Animal Anatomy / Morphology / Histology; Developmental Biology
ISSN
1062-3604
eISSN
1608-3326
D.O.I.
10.1134/S1062360410060056
Publisher site
See Article on Publisher Site

Abstract

Immunochemical labelling of neuronal elements and laser confocal microscopy have considerably expanded the capacity of comparative morphology, and allowed us to study neurogenesis in various trochophore animals at the level of identified neurons. The data obtained have impeached some popular phylogenetic theories. Thus, the comparative study has shown that in the representative Trochozoan species, the orthogonal brain is absent at all developmental stages. Fundamental differences in neurogenesis and neuroarchitecture between trochophores from different taxa suggest that trochophore-like larvae are not homologous, and their likeness is most probably the result of convergence. Our data support the “intercalation hypothesis” of the origin of indirect development with a trochophore-like larva. It seems reasonable to exclude from phylogenetic discussions the orthogon and the trochophore as an ancestral form common for Lophotrochozoa.

Journal

Russian Journal of Developmental BiologySpringer Journals

Published: Dec 2, 2010

References

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