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MORPHOLOGY OF LARVAE, DEUTONYMPHS, AND ADULTS OF THE WATER MITE NAJADICOLA INGENS (PROSTIGMATA: PARASITENGONA: HYGROBATOIDEA) WITH REMARKS ON PHYLOGENETIC RELATIONSHIPS AND REVISION OF TAXONOMIC PLACEMENT OF NAJADICOLINAE1

Published online by Cambridge University Press:  31 May 2012

Thomas W. Simmons  and
Ian M. Smith
Thomas W. Simmons
Affiliation:
Department of Biological Sciences, St. John's University, Jamaica, New York, U.S.A.11439
Ian M. Smith
Affiliation:
Biosystematics Research Institute, Agriculture Canada, Ottawa, CanadaK1A 0C6
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Abstract

Adults and deutonymphs of Najadicola ingens (Koenike) are redescribed and larvae are described for the first time. In light of larval, deutonymphal and adult character states, the phylogenetic relationship of Najadicola with genera in the families Pionidae and Unionicolidae is re-evaluated and transfer of the subfamily Najadicolinae to Pionidae is proposed. Original life history information is presented to supplement existing literature. Parasitism by larval N. ingens on an adult chironomid of the genus Polypedilum is reported. The unique behavioural and morphological characteristics of members of Najadicola suggest that mussel parasitism evolved independently from a parallel adaptive sequence in the genus Unionicola.

Résumé

Les auteurs présentent une nouvelle description des adultes et des deutonymphes de Najadicola ingens (Koenike) et une première description des larves de cette espèce. À la lumière des caractéristiques des larves, des deutonymphes et des adultes, nous réévaluons les rapports phylogénétiques de Najadicola avec les genres des familles Pionidae et Unionicolidae et suggérons de transférer la sous-famille des Najadicolinae aux Pionidae. Nous donnons des renseignements sur le cycle biologique pour compléter la documentation existante. Nous mentionnons un parasitisme par des larves de N. ingens sur un adulte chironomide du genre Polypedilum. Les caractères comportementaux et morphologiques uniques de Najadicola laissent à penser que le parasitisme des moules s'est développé de façon indépendante de l'évolution adaptive parallèle du genre Unionicola.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 5 , May 1984 , pp. 691 - 701
Copyright
Copyright © Entomological Society of Canada 1984

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