The genus Desmopachria Babington, subgenus Portmannia Young (Coleoptera: Dytiscidae)

  • The subgenus Portmannia Young (1980) of the Neotropical genus Desmopachriais characterized by its ovate, sometimes almost globose body form, smooth shining integument between relatively fine punctures, and sexually dimorphic prostemal process. In the females the prosternal process comes to a point as in other members of Desmopachria, but in males the process is bifid or forked. The species are found from Texas and Arizona to Brazil in South America. They are particularly abundant in Mexico. A key is given for twelve species which are described and figured. The following species are described as new: decorosus (Mexico), goias (Brazil), pittieri (Costa Rica), sobrina (Mexico) and zethus (Mexico). The color is variable. Some species are relatively darkly colored without distinct darker markings, and usually with some coarser punctation on part of the dorsum. These seem to be characteristic of the tropical forests (D. laevis Sharp and D. specula Sharp. D. goias is also dark with vague spots on the elytra). Most of the Mexican and Central American species are characterized by at least parts of the elytra being lighter in color than the head and pronotum, sometimes strikingly contrasting. The latter group may or may not have a distinct dark color patterns of the elytra or on head and pronotum. In both groups some species are intensely dark brown or black beneath, but this character maybe influenced by degree of hardening of the cuticle. Nearly all the species have darker markings along the suture of the elytra and base of the pronotum. Some species are distinctly patterned on the elytra which probably represents disruptive coloration helping to conceal them in the clear, sand-bottomed habitats in which most occur.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar
Author:Frank N. Young
Parent Title (English):Insecta mundi : a journal of world insect systematics
Publisher:Center for Systematic Entomology
Place of publication:Gainesville, Fla.
Document Type:Article
Date of Publication (online):2010/07/29
Year of first Publication:1995
Publishing Institution:Universit├Ątsbibliothek Johann Christian Senckenberg
Release Date:2010/07/29
Page Number:9
First Page:37
Last Page:45
Source:Gainesville, Fla. : Flora & Fauna Publ. - Insecta Mundi 09:1-2, S. 37-45
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 59 Tiere (Zoologie) / 590 Tiere (Zoologie)
Sammlungen:Sammlung Biologie / Sondersammelgebiets-Volltexte
Zeitschriften / Jahresberichte:Insecta Mundi / Insecta Mundi, Volume 9 (1995)
Licence (German):License LogoDeutsches Urheberrecht