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ALLOMETRY IN THE LAST LARVAL INSTARS OF SIMULIUM TRUNCATUM (LUNDSTRÖM) AND S. ROSTRATUM (LUNDSTRÖM) (DIPTERA: SIMULIIDAE)

Published online by Cambridge University Press:  31 May 2012

John W. McCreadie  and
Murray H. Colbo
John W. McCreadie
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
Murray H. Colbo
Affiliation:
Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland, Canada A1B 3X9
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Abstract

Data from larval head capsule measurements are used to determine allometry of size for final-instar siblings Simulium truncatum (Lundström) (= EFG/C) and S. rostratum (Lundström) (= ACD) of the S. venustum/verecundum complex (Diptera: Simuliidae). Measurements were evaluated using principal axis and major reduced axis regression. Isometry of size was accepted for only some ratios and it is argued that a character’s “environmental stability” should be assessed before it is considered as a taxonomic character.

Résumé

Les données obtenues en mesurant la capsule de la tête sont utilisées à déterminer la grandeur de la progéniture du dernier stade de Simulium truncatum (Lundström) (= EFG/C) et de S. rostratum (Lundström) (= ACD) du complexe de S. venustum/verecundum (Diptera : Simuliidae). Les mesures ont été déterminées en utilisant la régression de l’axe principal et l’axe majeur réduit. L’isométrie de grandeur n’a été acceptée que pour quelques rapports et nous discutons l’évaluation de la “stabilité environnementale” d’une caractéristique avant l’acceptation de ceci comme caractéristique taxonomique.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1137 - 1140
Copyright
Copyright © Entomological Society of Canada 1990

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