Zoomorphology

, Volume 137, Issue 2, pp 305–314 | Cite as

Comparative anatomy of pupal tarsi in caddisflies (Insecta: Trichoptera) with focus on the claw system

Original paper

Abstract

The decticous pupa of Trichoptera is an unusual case, as the larvae pupate in a silk cocoon under water. This leads to the problem that the pharate adult (i.e. the imago prior to eclosion within the pupal exuviae) has to cut through the cocoon and actively swim to land. To solve the latter problem, pupal legs are specifically modified. The midlegs are usually equipped with rows of hairs and are used as swimming legs to bring the insects to the water surface or the shore. Some species shed the pupal exuviae while floating on the water surface, others after crawling on stones or plants. It was assumed that this is assisted by attachment structures, especially the pupal claws. Pupal claws can differ distinctly in trichopteran lineages. However, detailed information on this character system is very limited in the literature. Furthermore, the functional principle of the pupal claw system is not well understood. Here, we present detailed data on the pupal tarsus of 15 species (14 families) using confocal laser scanning microscopy and histology. The results are discussed in terms of functional morphology, relations to larval habitat, pupal behavior, and phylogenetic implications.

Keywords

Trichoptera Tarsus Claws Pupa Eclosion Pharate adult Attachment structures 

Notes

Acknowledgements

The study was financed by the German Science Foundation (DFG, FR 3062/2-1). This is gratefully acknowledged. We thank Alice Wells (Australian National Insect Collection, CSIRO, Canberra), Matthias Gorka (Büro für GewässerÖkologie, Karlsruhe), and Hans Pohl (FSU Jena) for providing valuable specimens. Furthermore, we thank Sabine Gaude (Universität Hamburg) for preparing histological section of high quality and Carina Edel (Universität Hamburg) for helping with the visualization of 3D data. Comments on the manuscript by two anonymous reviewers are also acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or living animals performed by any of the authors.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Biozentrum GrindelUniversität HamburgHamburgGermany
  2. 2.Zoologisches Museum, Centrum für NaturkundeUniversität HamburgHamburgGermany

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