Pocadius yunnanensis Grouvelle, 1910

Cline, Andrew R., 2008, Revision of the sap beetle genus Pocadius Erichson, 1843 (Coleoptera: Nitidulidae: Nitidulinae, Zootaxa 1799 (1), pp. 1-120 : 111-116

Pocadius yunnanensis Grouvelle, 1910 ‘nomen resurrectum’

(Figs. 42, 83, 126, 169, 209, 248, 265)

Specimens examined. LECTOTYPE ♂ and PARALECTOTYPE ♀, here designated, (MNHN) ; 2 specimens

on same pin, ♂ on top and ♀ beneath: Yunnan / MUSEUM PARIS; Yunnan; H. Donckier 1907 / Pocadius ; yunnanus; Gr. ex. type. CO-TYPE ( BMNH) ♀: Yunnan; Mission / Yunnan; 1908-55 / [circular label] Co-type / Pocadius ; yunnanensis; ty. Grouv .

Diagnosis. Delimited by: circular antennal club; obsoletely carinate mesoventrite; broad abdominal process extending between metacoxae; small non-protuberant eyes; pronotum densely punctate; protibia with outer apical notch indistinct; gonocoxae with shallow incision between extensions; gonocoxal apices with 3 elongate setae; and reduced sclerotized baculi at gonocoxite base.

Redescription. Length 3.2 mm, Width 1.3mm, Depth 0.9mm. Body moderately convex, surface shining, brown to dark brown with extreme lateral pronotal margins and basal 0.25 of elytra (excluding humeri) orange-brown. Pronotal and elytral margins fimbriate, setae equal to antennal scape. Dorsal and ventral pubescence moderately long, golden.

Head surface deeply, irregularly punctate, large and small punctures evenly dispersed on vertex, becoming more densely aggregated towards orbits and fronotclypeal region. Large punctures 4X diameter of eye facet, small punctures 3X diameter; interspaces alutaceous and shining. Pronotal surface with large punctures slightly larger than large punctures on vertex, interspersed with small punctures, equal to larger ones on vertex; interspaces smooth to alutaceous, 0.25–0.5 diameters apart. Scutellar surface with vague shallowly impressed punctures similar to smaller ones on pronotum; interspaces alutaceous to granular. Elytral surface with serial rows of alternating large and small deep punctures. Small punctures equal to small ones on pronotum, large punctures 2X diameter of small ones. Small punctures giving rise to semi-erect moderately long setae, large punctures giving rise to semi-erect shorter golden setae, all setae with curved apices; interspaces narrow between punctures of a row and between rows. Within a row, small punctures separated by 1 puncture diameter, and large punctures by 0.5 puncture diameter. Rows separated by 0.5–0.75 large puncture diameters; interspaces shining but variable from smooth to alutaceous. Pygidium densely punctate, punctures equal to smaller ones on pronotum; interspaces narrow, 0.33 diameter apart, granular.

Venter with similar moderately long golden pubescence as dorsum. Mentum with several deeply impressed punctures, equal to large ones on vertex; interspaces granular to finely microreticulate. Submentum and gula with shallowly impressed punctures; interspaces completely granular. Prosternum and epimeron deeply irregularly punctate, punctures slightly larger than those on mentum, interspaces alutaceous to granular, prosternal and epimeron punctures separated by 0.25 diameter. Mesoventrite with shallow punctures similar to those on prosternum, interspaces alutaceous to granular, separated by 0.5 diameter, aggregated along metasternal border. Metaventrite irregularly punctate with moderately faint punctures on disc similar to those on mesoventrite, interspaces granular, punctures separated by 0.5–1 diameter. Abdominal sternite 1 with large faint obsolete punctures equal to those on metaventrite, interspaces granular, separated by 1 diameter. Hypopygidium with moderately deep punctures, similar to those on sternites 2–4, interspaces granular, punctures separated by 0.5 diameter.

Head wider than long (W:L = 1.65:1). Antennal club compact, nearly circular, symmetrical, last antennomere subequal to previous two combined. Antennomeres 6–8 more or less compact, disc-like. Antennal scape asymmetrical, somewhat hemispherical, 1.9X as long as pedicel. Pedicel subcylindrical. Antennal segment 3 subequal to pedicel. Antennal club moderately large, 0.55 length of segments 1–8 combined. Mentum with anterior angles present, anterior margins angular to narrowly rounded apex, overall pentagonal, flattened in lateral view.

Pronotum widest near posterior angles (L:W = 1:1.9), anterior margin broadly shallowly concave, lateral margins slightly arcuate anteriorly. Scutellum large, obtusely triangular, apex broadly rounded. Prosternal process in lateral view with anterior and posterior ends prominent, and convexity medially; posterior apical wall short and slightly oblique. Mesoventrite with faintly produced medial carina, and extending to midway between mesocoxae, evenly concave for reception of metaventrite. Metaventrite transverse (W:L = 2.66:1). Metepisternum with slight medial constriction, oblique line dividing anterior 0.125. First abdominal sternite with broadly rounded process between metacoxae. First sternite 2X’s longer than second. Sternites 2–4 subequal. Hypopygidium subequal to first sternite.

Protibia with apical tooth prominent, slightly longer than tarsomeres 1. Outer apical notch indistinct. Inner apical spine subequal to tarsomere 1 and part of 2 combined. Protibia not heavily armed but with stiff setae on inner apical region. Mesotibia more heavily armed than protibia with more dense stiff setae and numerous slender spines along lateral edge. Outer apical process elongate and robust, larger than protibial process. Inner apical spine equal to tarsomeres 1–2 combined. Metatibia with more armature than mesotibia, spines longer and more robust.

Male genitalia well-sclerotized. Anal sclerite with apex moderately fimbriate, and subapical depression (Fig. 42). Spiculum gastrale with moderately wide lateral flanges, medial margin diverging apically, some moderately long stiff setae originating from apex (Fig. 83). Tegmen narrowly rounded apically, widest posterior to middle (Fig. 126), longer than wide (w:l = 1:2.3), lateral row of setae visible from median fossa apex to apex, large elliptical shallow concavity in apical 0.33 with single row of inner setae completely attaining apex. Median lobe large and elliptical, 0.66 length of tegmen, apex moderately narrowed, apical opening well- developed with median indentation and distinctly separated bilobed internal structure (Fig. 169). Ejaculatory rods not fused to basal piece or to each other, slightly divergent from one another apically and inwardly curved. Basal piece of internal sac sclerite with paired structures with laterally acuminate base and a separate medial piece with a bifid basal margin (Fig. 209).

Female genitalia moderately sclerotized. Paraprocts moderately large with sclerotization along median line to lateral angles. Gonocoxite with two baso-lateral prominences. Gonocoxal apices without recurved “tooth”. Three elongate setae originate from small depressions on gonocoxal apices. Intragonocoxal invagination shallow, <0.33 length of gonocoxite (Fig. 248).

Variation. No variation observed.

Seasonality/Habitat. Unknown.

Distribution. Known from the type locality of Yunnan, China. Chatterjee (1924) also lists this species in his catalogue of Nitidulidae occurring in India; however this record has not been verified.

Notes. No host data available. Kirejtshuk (1984) synonomized P. yunnanensis with P. nobilis Reitter without providing detailed morphological explanations, however distinct differences are available that preclude the synonymy including both external and genitalic features. Kirejtshuk stated that the taxonomic change was “based on a study of many specimens of P. nobilis , and the type series of P. yunnanensis from (RNH)…”. Specimens of P. yunnanensis from RNH possessing the label data Kirejtshuk mentioned were not located during the course of this study. However, one Co-type specimen with the exact label data provided by Kirejtshuk was borrowed from the BMNH. This and two type specimens from the Grouvelle collection in Paris are the basis for the reinstatement of P. yunnanensis . Aedeagal, ovipositor and external characters all agree for separation of this species from P. nobilis (see description and key above). The type described by Grouvelle (1910) is available for study at the MNHN in Paris. The reinstatement above is based on the examination of the Grouvelle types from this institution as well as the material from the BMNH.