A revision of the subgenera Euhyboma Kolbe, 1893, Parahyboma Paulian, 1938, and Rubrohyboma Paulian, 1939 of Deltochilum Eschscholtz, 1822 (Coleoptera: Scarabaeidae: Scarabaeinae)

Everton E Nazaré-Silva,Fernando A B Silva

doi:10.1590/1806-9665-rbent-2020-0100

Abstract

This paper provides a revision of the three smallest subgenera of Deltochilum, all endemic to the Atlantic Forest of South America. Deltochilum (Euhyboma) and D. (Rubrohyboma) are monospecific taxa, composed of D. brasiliense (Castelnau, 1840) and D. rubripenne (Gory, 1831), respectively, whereas D. (Parahyboma) is composed of two allopatric species, D. furcatum (Castelnau, 1840) and D. granulosum Paulian, 1933. Lectotypes for D. brasiliense and D. rubripenne are designated. Each species is analyzed as follows: a detailed literature review, a diagnosis, description, illustrations of key morphological characters, list of material examined, and geographic distribution. An improved identification key to the subgenera of Deltochilum is presented.

Highlights

Deltochilum Eschscholtz, 1822 is one of the most diverse dung beetle genera, including 107 valid species and 4 subspecies (Schoolmeesters, 2020)
The genus is divided into eight subgenera: Aganhyboma Kolbe, 1893, Calhyboma Kolbe, 1893, Deltochilum s. str., Deltohyboma Lane, 1946, Euhyboma Kolbe, 1893, Hybomidium Shipp, 1897, Parahyboma Paulian, 1938 and Rubrohyboma Paulian, 1939 (Shipp, 1897; Paulian, 1938, 1939; Pereira and Martínez, 1956; Vulcano and Pereira, 1964; Génier, 2012)
This paper aims to present a taxonomic revision of the subgenera Euhyboma, Parahyboma, and Rubrohyboma, providing information on species identities, identification and geographical distributions

Summary

Introduction

Deltochilum Eschscholtz, 1822 is one of the most diverse dung beetle genera, including 107 valid species and 4 subspecies (Schoolmeesters, 2020). The subgenus Deltochilum (Euhyboma) was described by Kolbe (1893) for Deltochilum brasiliense (Castelnau, 1840), type species of the subgenus by monotypy (Lane, 1946). This species has been previously recorded in Colombia, Brazil, and Argentina (Kolbe, 1893; Paulian, 1938; Vulcano and Pereira, 1964), being historically diagnosed by the following characters: large body size, elytra with short lateral carina and epipleural carina absent (Kolbe, 1893; Vaz-de-Mello et al, 2011). The following diagnostic characters were provided by Paulian (1938) for the subgenus: small body size, convex, with short legs; clypeus quadridentate; and metaventrite with a single posterior pit, without tubercles

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