Abstract
Stenocyphus Marshall, 1922 (Entiminae, Naupactini) includes three species: the type species S. bituberosus (Gyllenhal, 1833), S. tuberculatus (Hustache, 1938), comb. n. herein transferred from Neoericydeus Hustache, 1938, and S. sextuberosus sp. n. The genus is endemic to the Atlantic forests of the states of Espirito Santo, Rio de Janeiro and São Paulo, Brazil andis mainly characterized by the presence of humped elytra bearing large conical tubercles on the intervals 5, or 3 and 5, or 3, 5 and 7. It shares some external morphological characters with Hadropus Schoenherr, 1826 and the Brazilian species of Cyrtomon Schoenherr 1823, but its phylogenetic position is uncertain. Herein we provide a diagnostic key to separate Stenocyphus from those genera, generic and species redescriptions or descriptions, a key to species, habitus photographs, line drawings of genitalia, and a discussion of the patterns of elytral tubercles in unrelated genera of Neotropical broad-nosed weevils.
Highlights
Stenocyphus was described by Marshall (1922) as a monotypic genus of Entiminae Schoenherr, 1823, tribe Naupactini Gistel, 1848, based on the type species Cyphus bituberosus Gyllenhal, 1833
The main objective of this contribution is to redescribe Stenocyphus, as well as its type species S. bituberosus (Gyllenhal), to describe a new species, S. sextuberosus, and to accommodate one species transferred from Neoericydeus Hustache, 1938, N. tuberculatus (Hustache, 1938), establishing the new combination Stenocyphus tuberculatus
In a preliminary cladogram of the Naupactini genera, Stenocyphus shows an uncertain, position, it is probably related to a group of genera characterized by the presence of humped elytra and broad squamose corbels
Summary
Stenocyphus was described by Marshall (1922) as a monotypic genus of Entiminae Schoenherr, 1823, tribe Naupactini Gistel, 1848, based on the type species Cyphus bituberosus Gyllenhal, 1833. It is endemic to Brazil, where it occurs in the Atlantic province of the Neotropical region sensu Morrone (2006). It was included in diagnostic keys of Naupactini by Emden (1944) and Hustache (1947), Stenocyphus was never revised. We provide habitus photographs of the three species, drawings of female and male genitalia, and a discussion on probable generic relationships and development of elytral tubercles in other Neotropical Entiminae
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