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DESCRIPTION OF THE LARVA OF HELLUOMORPHOIDES PRAEUSTUS BICOLOR HARRIS WITH COMMENTS ON THE RELATIONSHIPS OF THE HELLUONINI (COLEOPTERA: CARABIDAE)

Published online by Cambridge University Press:  31 May 2012

Yves Bousquet
Yves Bousquet
Affiliation:
Biosystematics Research Centre, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6
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Abstract

The larva of Helluomorphoides praeustus bicolor Harris is described and illustrated from two specimens. This is the first larva of Helluomorphoides Ball, a New World genus belonging to the tribe Helluonini, described although parts of an undetermined species of the genus were figured by Thompson (1979). Analysis of larval characters of the tribes Helluonini and Anthiini supports the hypothesis that these two groups are closely related. At least three autapomorphic character states are identified for members of Helluonini and Anthiini: the antacoria between the antennomeres II and III is represented by a suture or is absent; the stipes has a medial excrescence which may or may not be fused with the first galeomere; and the urogomphi are stout, fixed dorsally to the ninth tergite, and possess numerous long setae in the first instar. The sister group of the Helluonini–Anthiini lineage could not be identified but a number of the synapomorphies of this complex also occur in the Galeritini and Pseudomorphini.

Résumé

La larve de Helluomorphoides praeustus bicolor Harris est décrite et illustrée à partir de deux specimens. Il s’agit de la première description d’une larve de Helluomorphoides Ball, un genre du Nouveau-Monde appartenant à la tribu des Helluonini, bien que certaines structures d’une espèce non identifiée aient été dessinées par Thompson (1979). L’analyse des caractères larvaires des Helluonini et des Anthiini supporte l’hypothèse que les deux tribus sont très apparentées. Au moins trois caractéristiques autapomorphiques ont pu être identifiées chez les représentants des Helluonini et des Anthiini : l’antacorie entre l’antennomère II et III est représentée soit par une suture ou est absente; le stipe présente une excroissance qui peut être fusionnée ou non avec le premier galeomère; les urogomphes sont robustes, fixés dorsalement au neuvième tergite, et portent plusieurs longues soies au premier stade. Le taxon-frère du complexe Helluonini–Anthiini n’a pu être identifié mais un certain nombre de synapomorphies du complexe se rencontrent chez les Galeritini et les Pseudomorphini.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 10 , October 1987 , pp. 921 - 930
Copyright
Copyright © Entomological Society of Canada 1987

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