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The New World genera of Parathalassiinae (Diptera: Empidoidea: Dolichopodidae s.l.), with new species of Thalassophorus and Eothalassius

Published online by Cambridge University Press:  07 September 2012

Scott E. Brooks  and
Jeffrey M. Cumming
Scott E. Brooks*
Affiliation:
Invertebrate Biodiversity, Agriculture and Agri-Food Canada, K.W. Neat by Building, Central Experimental Farm, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
Jeffrey M. Cumming
Affiliation:
Invertebrate Biodiversity, Agriculture and Agri-Food Canada, K.W. Neat by Building, Central Experimental Farm, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
*
1Corresponding author (e-mail: [email protected]).
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Abstract

The parathalassine genera Thalassophorus Saigusa, Eothalassius Shamshev and Grootaert, and Chimerothalassius Shamshev and Grootaert are recorded from the New World for the first time. Thalassophorus arnaudi Brooks and Cumming sp. nov. is described from specimens collected at coastal localities in British Columbia, Oregon, and California, and represents the second known species in the genus, the type species being T. spinipennis Saigusa, known only from Rishiri Island in Hokkaido Prefecture, Japan. Detailed illustrations of the male genitalia of T. spinipennis are provided. Eothalassius borkenti Cumming and Brooks sp. nov. is described from specimens collected along the Pacific coast of Costa Rica, bringing the total number of described species of this former Southeast Asian genus to three, with one probable additional described species in the Mediterranean region. The genus Chimerothalassius, which was previously known from a single New Zealand species, is recorded from the island of Dominica, based on a female specimen plus a slide-mounted wing of an undescribed species. A new undescribed parathalassiine genus is also recorded from Chile, based on limited material of two undescribed species. A key to the six genera of Parathalassiinae in the New World, including Parathalassius Mik and Microphorella Becker, is given, as are some preliminary remarks on the limits and phylogenetic relationships of the parathalassiine genera.

Résumé

On mentionne pour la première fois la présence des genres de Parathalassiinae Thalassophorus Saigusa, Eothalassius Shamshev et Grootaert et Chimerothalassius Shamshev et Grootaert dans le Nouveau Monde. On décrit Thalassophorus arnaudi Brooks et Cumming sp. nov. à partir de spécimens récoltés dans des localités côtières en Colombie-Britannique, en Oregon et en Californie, laquelle représente la deuxième espèce du genre. L'espèce type, T. spinipennis Saigusa, est connu uniquement de l'île Rishiri dans la préfecture d'Hokkaido, au Japon. Les génitalia mâles de T. spinipennis sont illustrés en détail. On décrit Eothalassius borkenti Cumming et Brooks sp. nov. à partir de spécimens récoltés le long de la côte pacifique du Costa Rica. Auparavant restreint au Sud-Est asiatique, ce genre contient maintenant trois espèces, avec probablement une espèce additionnelle dans la région méditerranéenne. Le genre Chimerothalassius, auparavant représenté que par une espèce de Nouvelle-Zélande, est ici repertorié de l'île de la Dominique à partir d'un spécimen femelle et d'une aile montée sur lame d'une espèce non décrite. Un nouveau genre de Parathalassiinae est aussi répertorié du Chili, d'après un nombre limité de spécimens de deux espèces non décrites. On présente une clé d'identification des six genres de Parathalassiinae du Nouveau Monde, incluant Parathalassius Mik et Microphorella Becker, ainsi que quelques remarques préliminaires sur le concept et les relations phylogénétiques des genres de Parathalassiinae.

Type
Research Article
Information
The Canadian Entomologist , Volume 143 , Issue 5 , September 2011 , pp. 423 - 446
Copyright
Copyright © Entomological Society of Canada 2011

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