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SEXUAL DIMORPHISM IN THE SWEET POTATO WEEVIL, CYLAS FORMICARIUS (F.) (COLEOPTERA: BRENTIDAE)

Published online by Cambridge University Press:  31 May 2012

Christopher K. Starr ,
David D. Wilson ,
Ray F. Severson  and
Stanley J. Kays
Christopher K. Starr
Affiliation:
Department of Horticulture, University of Georgia, Athens, Georgia, USA 30602
David D. Wilson
Affiliation:
Department of Horticulture, University of Georgia, Athens, Georgia, USA 30602
Ray F. Severson
Affiliation:
Tobacco Quality and Safety Research Unit, USDA-ARS, Athens, Georgia, USA 30613
Stanley J. Kays
Affiliation:
Department of Horticulture, University of Georgia, Athens, Georgia, USA 30602
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Abstract

Cylas formicarius (F.) shows a strong overall sexual monomorophism, with external differences noted in only three organs: (a) relative size of the hind wings; (b) form of the antennal club and numbers of its different types of sensillum; and (c) size of the compound eyes and their individual facets. We relate these to known or predicted behavioural differences. Eye dimorphism is used to test a theoretical rule on the relationship between differences in overall eye size and in the size of individual ommatidia. Some sexually monomorphic features are briefly discussed, including two types of putatively sensory hairs not found on the antennae.

Résumé

Dans l’ensemble, un monomorphisme sexuel bien évident prévaut chez Cylas formicarius (F.) et seulement trois organes externes diffèrent chez les mâles et les femelles, (a) la taille relative des ailes postérieures, (b) la forme de la massue antennaire et le nombre des différents types de sensilles qui s’y trouvent, (c) la taille des yeux composés et de leurs facettes. Nous avons pu établir la relation entre ces caractéristiques et les différences de comportement que l’on suppose en découler. Le dimorphisme des yeux a servi à éprouver un concept théorique sur la relation entre les différences dans la taille des yeux et dans la taille des ommatidies qui les composent. Certaines caractéristiques monomorphes sont examinées brièvement, notammment deux types de poils probablement sensoriels qui ne se trouvent pas sur les antennes.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 129 , Issue 1 , February 1997 , pp. 61 - 69
Copyright
Copyright © Entomological Society of Canada 1997

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