Deltochilum (Hybomidium) gibbosum ( Fabricius, 1775 )

Hielkema, Auke J. & Hielkema, Meindert A., 2019, An annotated checklist of the Scarabaeoidea (Insecta: Coleoptera) of the Guianas, Insecta Mundi 732 (732), pp. 1-306 : 77

§ Deltochilum (Hybomidium) gibbosum ( Fabricius, 1775)

Scarabaeus gibbosus Fabricius 1775: 28 (America)

Distribution. Guyana: Forsyth and Gill 1993: 70 (as D. gibbosum [s. l.]). Venezuela (EO): Ferrer- Paris et al. 2013: 109 (EO). Other: Fabricius 1775: 28 (America - as Scarabaeus gibbosus ); Paulian 1938: 260 (Ecuador, Guatemala, Mexico, Nicaragua, [Peru] as D. (Tetraodontides) gibbosum var. sublaeve ; U.S.A. - as D. (Tetraodontides) gibbossum [sic]); Blackwelder 1944: 202 (Mexico - as D. gibbosum var. sublaeve ; U.S.A. - as D. gibbosum [s. str.]); Vulcano and Pereira 1964: 648 (Central America, Ecuador, Mexico, U.S.A. - as D. (Hybomidium) gibbosum [s. l.]); Medina et al. 2001: 136 (Colombia - as D. gibbosum panamensis ); Noriega et al. 2007: 82 (Colombia - as D. gibbosum cf. panamense); González et al. 2009: 269 (Colombia, Costa Rica, Panama - as D. (Hybomidium) gibbosum panamensis ); González-Alvarado and Vaz-de-Mello 2014: 434 (U.S.A.).

Note. Since the three former subspecies of Deltochilum gibbosum ( D. sublaeve H. W. Bates, 1887 (p. 36), D. densepunctatum Balthasar, 1939 ( 1939g, p. 17) and D. panamensis Howden, 1966 (p. 736)) are recognized as distinct species by González-Alvarado and Vaz-de-Mello (2014), the distribution of D. gibbosum is limited to the southern U.S.A. The newly recognized D. sublaeve and D. densepunctatum are likely endemic to Mexico, while D. panamensis appears to be restricted to Costa Rica, Colombia, Ecuador, Panama and Peru. We are aware of two records for D. gibbosum [s. l.] from the research area. These records are given in Forsyth and Gill (1993: 70) and Ferrer-Paris et al. (2013: 109) and, respectively, contain the data “ Guyana Kanuku Mountain Region Maipaima Creek II-1993 A. Forsyth” and “ Venezuela Bolívar Sabanas de Guri (07°52′57″N, 63°09′40″W) 100–200m 12/ 15-VIII-2005.” Given the known distribution of the species and its former subspecies, we believe these records are caused by erroneous identifications, with the most likely true identity being D. guildingii . We regard D. gibbosum (s. l.) as not occurring in the research area. See also under D. guildingii .