The South American Dung Beetle GenusEnnearabdusLansberge (Coleoptera: Scarabaeidae: Scarabaeinae: Eucraniini)

Abstract

The South American endemic dung beetle genus Ennearabdus Lansberge is revised. Description, diagnosis and illustrations are presented for the only known species of the genus, E. lobocephalus (Harold). A lectotype is designated for Onthophagus lobocephalus Harold, the type species of Ennearabdus. The biology, biogeography, conservation status, and distribution based on the predictive distribution model of E. lobocephalus are also discussed.

Male Horn Lack of Allometry May be Tied to Food Relocation Behaviour in Lifting Dung Beetles (Coleoptera, Scarabaeidae, Eucraniini)

“…The hypothesis that male polymorphism should be considered a plesiomorphic character shared by these two sister clades must, therefore, be rejected. Noteworthy, within the Eucraniini species, Ennearabdus lobocephalus (Harold, 1868) shows far less developed head projections, and is considered the most primitive species within the tribe [6,8], suggesting thus that the extreme development of clypeal horns showed by the other species of this tribe is a derivative condition. An alternative hypothesis that could be supported by the present finding is that morphological integration of traits depends on functional constraints.…”

“…This small coprophagous tribe is currently subdivided into the four genera Anomiopsoides Blackwelder, 1944, Ennearabdus Lansberge, 1874, Eucranium Brullé, 1837 and Glyphoderus Westwood, 1837 [3,4,5,6,7], whose systematics were recently reviewed in a thorough survey of their current taxonomic status, nesting behaviour [2], and phylogenetic relationships [8,9].…”

“…The males of Anomiopsoides, Eucranium, and Glyphoderus carry two pairs of elongated horns in the clypeal fronto-lateral part of the head, and the females have similar, but shorter and less developed, horns [3,4,5,7]. In contrast, Ennearabdus shows a far less complex head morphology, with only two small horns on the frontal carina of the male while the head of the female is unarmed [6].…”

A Revision of the Argentinean Endemic GenusEucraniumBrullé (Coleoptera: Scarabaeidae: Scarabaeinae) with Description of one New Species and New Synonymies

“…F.C. Ocampo, E. Ruiz, G. Salazar””; ““ Psammotrupes / dentifrons / Guéérin-Mééneville / Neotype / F. C. Ocampo 2010 .”” Neotype here designated.…”

“…The other three Eucraniini genera, Glyphoderus , Anomiopsoides, and Ennearabdus, were revised by Ocampo ( 2004 , 2005 , 2007 , 2010 ). The purpose of this contribution is to provide a taxonomic revision of the genus Eucranium including the description of one new species, to provide diagnosis and key to species, and to discuss their distribution, biology, and conservation status.…”