Deltochilum nonstriatum sp. nov.

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

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

Diagnosis

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

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.

Description

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

HEAD (Fig. 2C). 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). 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, 4C). Carina of the ninth interstria surpassing middle of elytral length. Striae I–VIII inconspicuous including apically (Fig. 5C), 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).

ABDOMEN (Fig. 6C). 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). 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, 8C). Aedeagus as described in the gilli species group. Medial endophallite almost straight. Sub-medial area of endophallus with scales (Fig. 8C, 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, red star).