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EVIDENCE FOR MONOPHYLY AND RELATIONSHIPS OF CHALCIDOIDEA, MYMARIDAE, AND MYMAROMMATIDAE (HYMENOPTERA: TEREBRANTES)1

Published online by Cambridge University Press:  31 May 2012

Gary A.P. Gibson
Affiliation:
Biosystematics Research Institute, Agriculture Canada, Ottawa, Ontario, Canada K1A 0C6

Abstract

Twenty-three characters or character systems of adults and larvae of Terebrantes are analyzed for evidence of monophyly and phyletic relationships of Chalcidoidea, Mymaridae, and Mymarommatidae. The taxa are considered to be a monophyletic group based on 3 hypothesized synapomorphies: mesotrochanteral depressor without fu2-tr2 or mesoscutal portion of t2-tr2; axillar phragma as site of origin for all or part of t,-tr2 muscle; and independent basal ring absent from male genitalia. The family Mymaridae is considered to be monophyletic based on at least 3 apomorphies: fore wing with hypochaeta; head with frontal, median, and supraorbital sulci; and toruli distinctly closer to inner margin of eye than to each other. Chalcidoidea, including Mymaridae, is considered to be a monophyletic taxon based on 3 apomorphies: prepectus externally visible, at least dorsally adjacent to lateral edge of mesoscutum; mesothoracic spiracle positioned at exposed lateral edge of mesoscutum; and multiporous plate sensilla of antenna with unique structure, as described in text. Mymarommatidae is considered to be the monophyletic sister group of Chalcidoidea based on several apomorphies, including 4 autapomorphies: head composed of frontal and occipital sclerites, which are connected by pleated membrane along hyperoccipital region; hind wing stalk-like, without membrane and terminated in bifurcation that clasps fore wing; fore wing with reticulate pattern formed by raised lineations of membrane; and axillar portion of t2-tr2 muscle absent. Phyletic relationship of Serphitidae with Mymarommatidae is deemed inconclusive because relevant internal character states of amber fossil serphitids cannot be determined. It is suggested that mymarommatids be accorded family status, but not be assigned to superfamily until phyletic relationships are more accurately determined in Terebrantes. A matrix summarizes character-state distribution of most characters analyzed for Terebrantes, and a cladogram illustrates hypotheses of character-state evolution and proposed relationships.

Résumé

L’ouvrage analyse 23 caractères ou systèmes de caractères d’adultes et de larves de Térébrantes pour l’existence de rapports monophyliques et phylétiques des Chalcidoidea, Mymaridae et Mymarommatidae. Les taxons sont considérés comme un groupe monophylétique fondé sur 3 synapomorphies hypothétiques, soit le dépresseur mésotrochantéral sans fu2-tr2 ou la portion mésoscutale de t2-tr2, du phragme axillaire comme point d’origine pour la totalité ou une partie du muscle t2-tr2 et l’absence d’anneau basal indépendant des génitalia mâles. La famille des Mymaridae est considérée comme monophylétique fondée sur au moins 3 apomorphies, soit l’aile antérieure pourvue d’un hypochète, la tête dotée de sillons frontaux, médians et supraorbitaux et des toruli distinctement plus rapprochés de la bordure interne de l’oeil que l’un par rapport à l’autre. Les Chalcidoidea, y compris les Mymaridae, sont considérés comme un taxon monophylétique fondé sur 3 apomorphies, soit un prépectus visible de l’extérieur (au moins dorsalement voisin du bord latéral du mésoscutum), des stigmates mésothoraciques situés sur le bord latéral exposé de mésoscutum et des sensilles placoïdes multipores d’antenne à structure unique comme le décrit le texte. Les Mymarommatidae sont considérés comme un groupe soeur monophylétique des Chalcidoidea d’après plusieurs apomorphies, y compris 4 autapomorphies, soit la tête composée d’un sclérite frontal et occipital reliés par une membrane plissée le long de la région hyperoccipitale, une aile postérieure pédonculée sans membrane et terminée par une bifurcation qui vient s’agraffer sur l’aile antérieure, une aile antérieure réticulée formée par des lignes soulevées de la membrane et l’absence de portion axillaire du muscle t2-tr2. Le rapport phylétique des Serphitidae avec les Mymarommatidae est jugé peu concluant car il est impossible de déterminer l’état de caractères internes pertinents de Serphitidés fossilisés dans l’ambre. Il est proposé d’accorder le statut de famille aux Mymarommatidés, mais de ne pas leur attribuer de superfamille avant d’avoir mieux défini les rapports phylétiques des Térébrantes. Un tableau résume la distribution de la plupart des caractères examinés pour les Térébrantes et un cladogramme illustre certaines hypothèses d’évolution de l’état des caractères et des rapports proposés.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1986

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