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DESCRIPTION OF THE LARVAL STAGES OF HYDROPORUS (HETEROSTERNUTA) COCHECONIS FALL 1917 (COLEOPTERA: DYTISCIDAE: HYDROPORINAE) WITH A KEY TO THE KNOWN LARVAE OF HETEROSTERNUTA STRAND

Published online by Cambridge University Press:  31 May 2012

Yves Alarie
Yves Alarie
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
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Abstract

Description of structures of all three larval instars of Hydroporus (Heterosternuta) cocheconis Fall 1917 is presented. The chaetotaxy and porotaxy of the cephalic capsule, head appendages, legs, last abdominal segment, and urogomphi are discussed in detail. Hydroporus cocheconis is compared with Hydroporus (Heterosternuta) wickhami Zaitzev 1907. Both species share a very short and constricted siphon; this character state is suggested as a synapomorphy of the subgenus Heterosternuta Strand 1935.

Résumé

La description détaillée des trois stades larvaires de l’espèce Hydroporus (Heterosternuta) cocheconis Fall 1917 est présentée. L’analyse chétotaxique et porotaxique détaillée de la capsule et des appendices céphaliques, des pattes, du dernier segment abdominal et des urogomphes est effectuée. L’espèce Hydroporus cocheconis est comparée à Hydroporus (Heterosternuta) wickhami Zaitzev 1907. Ces deux espèces se caractérisent par la présence d’un siphon court et étranglé. Ce trait est suggéré à titre de synapomorphie du sous-genre Heterosternuta Strand 1935.

Type
Articles
Information
The Canadian Entomologist , Volume 124 , Issue 5 , October 1992 , pp. 827 - 840
Copyright
Copyright © Entomological Society of Canada 1992

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References

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