Deltochilum gilli Gonzalez-Alvarado & Vaz-de-Mello 2021
Creators: name: González-Alvarado, Arturo
name: Vaz-De-Mello, Fernando Z.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Deltochilum
Deltochilum gilli

description: Identification key to species of the gilli species group
1. Striae I–VII inconspicuous, including apically, only in some parts striae slightly visible and very narrow (Fig. 4B–C)............................................................................................................................ 2
– Striae I–VII conspicuous (Fig. 4A, D–E) .......................................................................................... 3
2. Head punctures on frons separated by less than one diameter of a puncture (Fig. 2B). Pronotal disc punctures separated by less than one diameter (Fig. 3B, F). Pronotal disc with well-defined shiny points (Fig. 3F, white arrows). Punctures of third interstria on disc occupying about 1/14 th the distance between striae II and III (Fig. 4B). Width of expansion of first ventrite of male, on third ventrite, subequal to distance between clypeal teeth (Fig. 6B). Guyana, District 8: Mount Wokomung (Fig. 10, yellow square) ..................................................................... Deltochilum jocelynae sp. nov. – Head punctures on frons almost contiguous (Fig. 2C). Pronotal disc punctures separated by less than one diameter, almost contiguous (Fig. 3C, G). Pronotal disc with irregular shiny points (Fig. 3G, white arrows). Punctures of third interstria on disc occupying about 1/10 th the distance between striae II and III (Fig. 4C). Width of expansion of first ventrite of male, on third ventrite, narrower than distance between clypeal teeth (Fig. 6C). Venezuela, Bolivar (Fig. 10, red star) ............................................................................................... Deltochilum nonstriatum sp. nov.
3. Elytral apical tubercles on interstriae III–VII (Fig. 5A). First stria almost twice wider than second stria (Fig. 4A). Striae III–VII subequal in width and conspicuous (Fig. 4A). Pronotal disc with shiny points well-defined and separated from punctures (Fig. 3A). Male metatrochanter with expansion on distal third. Width of expansion of first ventrite of male, on third ventrite, wider than distance between clypeal teeth (Fig. 6A). Sub-medial area of endophallus with elongate scales (Fig. 8A, arrow). Guyana, District 8: Mount Wokomung (Fig. 10, blue circle) .................................................. Deltochilum gilli González-Alvarado & Vaz-de-Mello, 2021
– Elytral apical tubercles on interstriae III, V–VII (Fig. 5D–E). First stria subequal to slightly wider than second stria (Fig. 4D–E). Striae III–VII successively thinner and more ill-defined (Fig. 4D– E). Pronotal disc with shiny points irregular and contiguous to punctures (Fig. 3D–E). Male metatrochanter not modified. Width of expansion of first ventrite of male, on third ventrite, subequal to distance between clypeal teeth (Fig. 6D–E). Sub-medial area of endophallus with scales, but not elongate (Fig. 8D–E) Guyana, Mazaruni-Potaro District. Venezuela Bolívar (Fig. 10, white eightpoint star and green triangle) ............................................................................................................. 4
4. First stria wider than second stria (Fig. 4D). Punctures of third interstria on disc occupying about 1/10 th the distance between striae II and III (Fig. 4D). Pygidium with discal punctures occupying approximately 1/29 th the width on middle of pygidium and basal punctures almost contiguous (Fig. 5D). Guyana, Mazaruni-Potaro District: Takutu Mountains (Fig. 10, green triangle)....................................................................................... Deltochilum quasistriatum sp. nov.
– First stria subequal in width to second stria (Fig. 4E). Punctures of third interstria on disc occupying about 1/14 th the distance between II and III (Fig. 4E). Pygidium with discal punctures occupying approximately 1/38 th the width on middle of pygidium basal punctures separated by less than one diameter but not almost contiguous (Fig. 5E). Venezuela, Bolívar: 10 km E of San Francisco (Fig. 10, white eight-point star) ................................................................. Deltochilum tenuistriatum sp. nov.
description: Published as part of González-Alvarado, Arturo & Vaz-De-Mello, Fernando Z., 2021, Taxonomic revision of the Deltohyboma Lane, 1946 gilli species group (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilum), pp. 86-106 in European Journal of Taxonomy 775 on pages 103-104, DOI: 10.5852/ejt.2021.775.1551, http://zenodo.org/record/5589689