The Development and Evolution of Arthropod Tagmata

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Authors

Ariel D Chipman

Abstract

The segmented body plan is a hallmark of the arthropod body plan. Morphological segments are formed during embryogenesis, through a complex procedure involving the activation of a series of gene regulatory networks. The segments of the arthropod body are organized into functional units known as tagmata, and these tagmata are different among the arthropod classes (e.g. head, thorax and abdomen in insects). Based on embryological work on segment generation in a number of arthropod species, coupled with a survey of classical descriptions of arthropod development, I suggest a new framework for the evolution of arthropod tagmata. The ancestral condition involves three developmental tagmata: The pre-gnathal segments, a tagma that is formed within a pre-existing developmental field and a tagma that is formed through the activity of a segment-addition zone, that may be embryonic or post-embryonic. These embryonic tagmata may fuse post-embryonically to generate more complex tagmata. This framework is consistent with the evolution of tagmosis seen in the early arthropod fossil record. It also calls for a re-thinking of the decades-old division of arthropod development into short-germ vs. long-germ development, and a re-thinking of questions of segment identity determination, and the role of Hox genes in tagma differentiation.

DOI

https://doi.org/10.32942/X28906

Subjects

Biology, Cell and Developmental Biology, Developmental Biology, Ecology and Evolutionary Biology, Entomology, Evolution, Integrative Biology, Life Sciences

Keywords

Arthropods, tagma, segment-identity, Hox genes, body-plan

Dates

Published: 2024-12-10 13:14

License

CC-BY Attribution-NonCommercial 4.0 International

Additional Metadata

Language:
English

Conflict of interest statement:
None