Deltochilum nonstriatum, González-Alvarado & Vaz-De, 2021

González-Alvarado, Arturo & Vaz-De-Mello, Fernando Z., 2021, Taxonomic revision of the Deltohyboma Lane, 1946 gilli species group (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilum), European Journal of Taxonomy 775, pp. 86-106 : 99-101

publication ID	https://doi.org/ 10.5852/ejt.2021.775.1551
publication LSID	lsid:zoobank.org:pub:976D7020-5904-4951-97CE-B4FE58DA12A8
DOI	https://doi.org/10.5281/zenodo.5589709
persistent identifier	https://treatment.plazi.org/id/03F48795-DC50-FFBC-A614-A6C2FB8BFDF7
treatment provided by	Felipe
scientific name	Deltochilum nonstriatum
status	sp. nov.

Treatment

Deltochilum nonstriatum View in CoL sp. nov.

urn:lsid:zoobank.org:act:563D19C2-0450-4A9E-A4DC-B4AD395F25F0

Figs 1C View Fig , 2C View Fig , 3C, G View Fig , 4C View Fig , 5C View Fig , 6C View Fig , 7C, G View Fig , 8C View Fig , 10 View Fig

Diagnosis

Close to D. jocelynae sp. nov. by having the striae I–VII inconspicuous ( Figs 1B–C View Fig , 4B–C View Fig ) including apically ( Fig. 5B–C View Fig ). However, it can be distinguished by presenting the largest and densest interstrial punctures ( Fig. 4C View Fig ), as well as densest punctures on the head frons ( Fig. 2C View Fig ) and on the pronotal disc ( Fig. 3C, G View Fig ); finally, by the irregular shiny points on the pronotal disc ( Fig. 3C, G View Fig ).

Etymology

From Latin non - 'not' + stria in reference to the inconspicuous elytral striae.

Type material

Holotype VENEZUELA • 1 ♂; Bolívar, km 40 Sta. [Santa] Elena, Icabaru Road; 7°26′20″ N, 61°33′30″ W; alt. 1000 m; 4–6 Aug. 1986; B.D. Gill leg.; [aedeagus and endophallus extracted]; CMNEN WSD00041746 . GoogleMaps

Description

MEASUREMENTS AND COLOR. Holotype male, length 8.4 mm, humeral width 5.2 mm. Dark green with red reflections dorsally ( Fig. 1C View Fig ). Black ventrally, with shiny red reflections on anterior area of metaventral process, meso- and metafemora and ventrite VI ( Fig. 6C View Fig ).

HEAD ( Fig. 2C View Fig ). Dorsal inter-ocular distance approximately seven times width of one eye. Punctures on frons separated by less than one diameter of each puncture, almost contiguous. Punctures on head disc separated by less than one diameter of each puncture.

PRONOTUM ( Fig. 3C, G View Fig ). Medial angle projected. Punctures on the disc separated by less than one diameter, almost contiguous. Shiny points on disc irregular and contiguous to punctures.

ELYTRA ( Figs 1C View Fig , 4C View Fig ). Carina of the ninth interstria surpassing middle of elytral length. Striae I–VIII inconspicuous including apically ( Fig. 5C View Fig ), only in some parts striae slightly visible and very narrow. Punctures of second and third interstriae on disc separated by less than one diameter. Punctures of third interstria on disc occupying about 1 ⁄ 10 th the distance between striae II and III. Apical tubercles on interstriae III, V–VII ( Fig. 5C View Fig ).

ABDOMEN ( Fig. 6C View Fig ). Width of expansion of ventrite I, on ventrite III, narrower than 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 rounded. Basal area of expansion with punctures separated by less than one diameter, almost contiguous.

LEGS. Apex of mesotibia on ventral-internal margin with a small spatulate expansion. Expansion of metafemur twice wider than the width of metafemur basal to expansion. Internal margin of metatibia with large tubercles, occupying almost all metatibial length.

PYGIDIUM ( Fig. 5C View Fig ). Most of the punctures separated by less than one diameter; punctures basally denser that punctures on disc; basal punctures contiguous. Discal punctures occupying approximately 1/28 th the width on middle of pygidium.

GENITALIA ( FigS 7C View Fig , 8C View Fig ). Aedeagus as described in the gilli species group. Medial endophallite almost straight. Sub-medial area of endophallus with scales ( Fig. 8C View Fig , arrow).

Remarks

This species is only known from the holotype. The holotype has an identification label from François Génier (CMNEN), in which he recognised this specimen as probably being a new species since 1998. The transcription of the label as follows: [handwritten] DELTOCHILUM /? SP. NOV. / [printed] Dét. F. Génier, 199 [handwritten]8.

Known distribution

VENEZUELA. Bolívar: km 40 Santa Elena, Icabarú Road ( Fig. 10 View Fig , red star).