Taxonomic revision of the Deltohyboma Lane, 1946 gilli species group (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilum) Author González-Alvarado, Arturo 2D58A702-73A9-4C66-8CED-6B8B9A2AB10B Programa de Pós-graduação em Ecologia e Conservação da Biodiversidade, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil. fagakorn@gmail.com Author Vaz-De, Fernando Z. 2FF2B7D6-1A6B-43C1-9966-A1A949FB2B05 Instituto de Biociências, Departamento de Biologia e Zoologia, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil. vazdemello@gmail.com text European Journal of Taxonomy 2021 2021-10-20 775 86 106 journal article 3948 10.5852/ejt.2021.775.1551 cc10c087-bec3-4947-81d7-b3e5580a5c94 2118-9773 5589689 976D7020-5904-4951-97CE-B4FE58DA12A8 Deltochilum jocelynae sp. nov. urn:lsid:zoobank.org:act: 6A25B58A-9A61-4C0D-95C3-BCC48729B806 Figs 1B , 2B , 3B, F , 4B , 5B , 6B , 7B, F , 8B , 9C–D , 10 Diagnosis Close to D . nonstriatum sp. nov. by having striae I–VII inconspicuous ( Figs 1B–C , 4B–C ) including apically ( Fig. 5B–C ). However, it can be distinguished by presenting the smallest and most disperse interstrial punctures ( Fig. 4B ) as well as most disperse punctures on head frons ( Fig. 2B ) and on pronotal disc ( Fig. 3B, F ) and finally, by the well-defined shiny points on the pronotal disc ( Fig. 3B, F ). Fig. 8. Endophallus of members of the gilli species group.Arrows show the scales on the sub-medial area of the endophallus. A . Elongate scales. C . Regular scales. A . Holotype of Deltochilum gilli González- Alvarado & Vaz-de-Mello, 2021, CNCI 379888. B . Holotype of D. jocelynae sp. nov. , CNCI 379889. C . Holotype of D . nonstriatum sp. nov. , CMNEN WSD00041746. D . Holotype of D . quasistriatum sp. nov. , CMNEN WSD00041744. E . Holotype D . tenuistriatum sp. nov. , CMNEN WSD00041745. Etymology A patronym, noun in the genitive case, for Jocelyn Gill. See also the “Acknowledgments” section. Type material Holotype GUYANA • 1 ♂ ; District 8, Mount Wokomung ; 5°05′33.4″ N , 59°50′34.4″ W ; alt. 1411 m ; 4–8 Nov. 2004 ; B. Hubley leg.; pitfall trap (human dung), primary forest ; ROM 2004526; BDGC ; [aedeagus and endophallus extracted]; CNC 379889 . Paratypes GUYANA • 1 ♂ ; same data as for holotype; BDGC • 1 ♀ ; same data as for holotype; 5º07′53.2″ N , 59º48′31.4″ W ; alt. 698 m ; 21–26 Oct. 2004 ; ROM 2004509; BDGC . Description MEASUREMENTS AND COLOR. Holotype male, length 8.1 mm , humeral width 5.1 mm . Dark green with some red reflections dorsally ( Fig. 1B ). Black ventrally, with shiny red reflections on anterior area of metaventral process, meso- and metafemora and ventrite VI ( Fig. 6B ). HEAD ( Fig. 2B ). Dorsal inter-ocular distance approximately seven times width of one eye. Punctures on frons separated by less than one diameter of each puncture. Punctures on head disc separated by less than one diameter of each puncture. PRONOTUM ( Fig. 3B, F ). Medial angle slightly projected. Punctures on the disc separated by less than one diameter. Shiny points on disc well-defined and contiguous to punctures. ELYTRA ( Figs 1B , 4B ). Carina of the ninth interstria reaching middle of elytral length. Striae I–VIII inconspicuous including apically ( Fig. 5B ), only in some parts striae slightly visible and very narrow. Punctures of second interstria on disc separated by one or less than one diameter, on third a slightly disperse. Punctures of third interstria on disc occupying about 1/14 th of the distance between striae II and III. Apical tubercles on interstriae III, V–VII ( Fig. 5B ). ABDOMEN ( Fig. 6B ). Width of expansion of the ventrite I, on ventrite III, subequal to distance between clypeal teeth; expansion reaching distal margin of ventrite IV. Margins of expansion between ventrites II–IV forming an acute angle. Apex of expansion truncate. Basal area of expansion with punctures separated by less than one diameter. LEGS. Apex of mesotibia on ventral-internal margin with a small spatulate expansion. Expansion of metafemur 1.8 × wider than the width of metafemur basal to expansion. Internal margin of metatibia with large tubercles, occupying almost all metatibial length. PYGIDIUM ( Fig. 5B ). Most of the punctures separated by less than one diameter; punctures basally denser than punctures on disc. Discal punctures occupying approximately 1/30 th the width on middle of pygidium. G ENITALIA ( Figs 7B , 8B ). Aedeagus as described in the gilli species group. Medial endophallite slightly sinuate. Sub-medial area of endophallus with scales. Remarks Only three specimens are known for this species, all teneral. The holotype does not appear to be teneral externally, however, the aedeagus is poorly sclerotised ( Fig. 7B ). The paratypes differ from the holotype by the sexual dimorphism and by having the elytra and the pygidium less sclerotised, with those structures light brown ( Fig. 9C–D ). It appears that this species is sympatric with D . gilli since both species were collected a few kilometres apart (see Fig. 10 , red square). Deltochilum gilli was collected almost 200 meters higher (altitude) than D . jocelynae sp. nov .. However, both species are easily separated via the elytra; D . gilli has conspicuous striae ( Fig. 4A ), whereas these are inconspicuous in D . jocelynae sp. nov. ( Fig. 4B ). Fig. 9. Habitus A, C and ventral view B, D of the only two females known of the gilli species group. A–B . Paratype of Deltochilum gilli González-Alvarado & Vaz-de-Mello, 2021 . C–D . Paratype D. jocelynae sp. nov. Known distribution GUYANA . District 8, Mount Wokomung ( Fig. 10 , yellow square).