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Functional Morphology and Diversity$
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Les Watling and Martin Thiel

Print publication date: 2013

Print ISBN-13: 9780195398038

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:osobl/9780195398038.001.0001

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The Crustacean Integument

The Crustacean Integument

Setae, Setules, and Other Ornamentation

Chapter:
(p.167) 6 The Crustacean Integument
Source:
Functional Morphology and Diversity
Author(s):

Anders Garm

Les Watling

Publisher:
Oxford University Press
DOI:10.1093/acprof:osobl/9780195398038.003.0006

The cuticle plays an important role in many aspects of crustacean biology, since it is the interface to the surrounding world. Thus, the cuticle displays many structural specializations all over the body. The structures considered here are setae, setules, denticles, and spines. Seven types of setae are recognised based on their detailed external morphology: plumose, pappose, composite, serrate, papposerrate, simple, and cuspidate. In support of the categorization of these setae, each seems to correlate with a specific functional outcome such as feeding, grooming, and locomotion. Little can be learned about the sensory functions from the external morphology of setae, but their ultrastructure seems to provide better cues. In particular, mechanoreceptors display structures related to transduction mechanisms, with the scolopale as a good example. Still, too few data are available outside malacostracans to draw general conclusions for all crustaceans, underlining the need for multidisciplinary and broad intertaxon studies.

Keywords:   crustacean cuticle, Crustacea, setae, cuticular outgrowths, setules, denticles, spines

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