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The extinct genus Pareuthychaeta in Eocene ambers (Diptera: Schizophora: Ephydroidea)

Published online by Cambridge University Press:  15 February 2012

David Grimaldi  and
Hukam Singh
David Grimaldi*
Affiliation:
Entomology, Division of Invertebrate Zoology, American Museum of Natural History, New York, New York 10024-5192, United States of America
Hukam Singh
Affiliation:
Birbal Sahni Institute for Palaeobotany, 53 University Road, Lucknow 226007, India
*
1Corresponding author (e-mail: grimaldi@amnh.org)
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Abstract

Pareuthychaeta Hennig was previously known only from two described species in Eocene Baltic amber (Lutetian, ca. 42 Ma), Pareuthychaeta electrica Hennig and Pareuthychaeta minuta (Meunier), some details of which are revised based on new specimens. A third Baltic species is described, Pareuthychaeta mcalpinei Grimaldi, sp. nov. Another species, Pareuthychaeta eoindica Grimaldi, sp. nov., is described in earliest Eocene (Ypresian-aged, ca. 50–52 Ma) amber from Gujarat, western India. Comments are provided on the relationships of Pareuthychaeta to Recent genera of Diastatidae sensu lato (including Campichoetinae), and implications of this extinct genus are discussed regarding biogeography and the early Paleogene Schizophora radiations.

Résumé

Pareuthychaeta Hennig n'est connu que pour ses deux espèces décrites dans l'ambre baltique de l’Éocène (Lutétien, environ 42 Ma), Pareuthychaeta electrica Hennig et Pareuthychaeta minuta (Meunier), dont certains détails sont présentement révisés à l'aide de nouveaux spécimens. Une troisième espèce baltique est décrite, Pareuthychaeta mcalpinei Grimaldi, sp. nov. Une autre espèce, Pareuthychaeta eoindica Grimaldi, sp. nov., est décrite dans l'ambre datant de l’Éocène le plus ancien (Yprésian, environ 50–52 Ma), et provenant de Gujarat, Inde de l'Ouest. Des commentaires sont fournis quant aux relations de Pareuthychaeta avec les genres actuels de Diastatidae sensu lato (Campichoetinae inclue), et les implications de ce genre éteint, en lien avec la biogeographie et la radiation des Schizophora du Paléogène inférieur, sont discutées.

Type
Original Article
Information
The Canadian Entomologist , Volume 144 , Issue 1 , 23 February 2012 , pp. 17 - 28
Copyright
Copyright © Entomological Society of Canada 2012

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