Pocadius testaceus Grouvelle, 1892

Cline, Andrew R., 2008, Revision of the sap beetle genus Pocadius Erichson, 1843 (Coleoptera: Nitidulidae: Nitidulinae, Zootaxa 1799 (1), pp. 1-120: 103-105

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http://doi.org/ 10.11646/zootaxa.1799.1.1

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Pocadius testaceus Grouvelle, 1892


Pocadius testaceus Grouvelle, 1892  

(Figs. 39, 80, 123, 166, 207, 245)

Specimens examined. HOLOTYPE ♀ ( MNHN): Mandar; Bengale / Type / Museum Paris; 1917; Coll. Grouvelle / 76 / Pocadius   ; testaceus; ty. Grouv   / Holotypus Pocadius   ; testaceus Grouvelle   ; det. Kirejtshuk 1994. Additionally, 1 ♂ and 1 ♀ ( BMNH): CEYLON, C. Prov.; Knucles, 1600m; 28-VI-1983; Ole Mehl Leg. 1 ♂ ( RMNH): India or. Biró, 1902 / Matheran; 800m.  

Diagnosis. Distinguished from other Pocadius   by the following: body uniformly testaceous; terminal antennomere enlarged, asymmetrical and longer than previous two segments combined; prosternal process in lateral view with posterior face long and with slight concavity, posterior region of prosternal process with marked declivity behind procoxae; metasternal disc glabrous with few widely spaced minute punctures; abdominal process broad between metacoxae; anal sclerite with an acute medial apex; apex of tegmen truncate to broadly rounded; basal piece of internal sac sclerites with deeply cleft apices; ovipositor with narrowly flanged paraprocts, gonocoxites with elongate baculi and gonocoxal extensions narrowly separated and abutting, intragonocoxal invagination shallow.

Redescription. Length 3.3 mm, Width 1.9mm, Depth 1.0mm. Body moderately convex, surface shining, uniformly testaceous. Pronotal and elytral margins with short fimbriae, setae subequal to antennal scape. Dorsal and ventral pubescence short, golden.

Head surface moderately deeply, irregularly punctate, punctures more dispersed on vertex, becoming aggregated towards orbits and fronotclypeal region. Large punctures 4–5X diameter of eye facet, small punctures 3X diameter; interspaces smooth to alutaceous, shining. Pronotal surface with large punctures equal to large punctures on vertex, interspersed with few small punctures, 0.50–0.75 large ones; interspaces alutaceous to finely microreticulate, 1–1.5 diameters apart on disc. Scutellar surface with few vague shallowly impressed punctures, punctures similar to small ones on pronotum; interspaces alutaceous. Elytral surface with serial rows of alternating large and small deep punctures. Small punctures equal to large ones on pronotum, large punctures 1.5X diameter of small ones. Small punctures giving rise to semi-erect to erect setae, large punctures giving rise to decumbent setae; interspaces narrow between punctures of a row and between different rows. Within a row, small punctures separated by 1 puncture diameter, and large punctures by 0.5–0.75 diameter. Large rows separated by 1.5 diameter; interspaces shining, alutaceous. Pygidium densely punctate, more so in apical 0.33, punctures equal to small ones on pronotum; interspaces narrow, 0.25–0.5 diameter, granular.

Venter with similar short golden pubescence as dorsum. Mentum with shallow minute punctures, equal to small ones on vertex, interspaces alutaceous to finely microreticulate. Submentum and gula similar in punctation to mentum but interspaces granular with some microreticulation. Prosternum and epimeron shallowly irregularly punctate, punctures 1.5X larger than those on mentum, interspaces alutaceous to granular, prosternal punctures separated by 0.5 diameter, those on epimeron by 0.5 diameter. Mesoventrite with shallow punctures, 0.75 diameter of those on prosternum, interspaces alutaceous to granular, separated by 0.5–1 diameter, most punctures aggregated near metasternal border. Metaventrite irregularly punctate with faint minute punctures on disc similar to small ones on venter, interspaces alutaceous on metasternal disc becoming microreticulate to granular laterally, punctures separated by>2–3 diameters on disc. Abdominal sternite 1 with faint small, obsolete punctures, equal to large ones on vertex, interspaces alutaceous, separated by 1–2 diameters. Hypopygidium with deeply impressed punctures, similar to those on sternites 2–4, interspaces alutaceous to granular, punctures separated by 0.5–1 diameter.

Head slightly wider than long (W:L = 1.28:1). Antennal club compact, somewhat oval, asymmetrical with last antennomere longer than previous two combined. Antennomeres 6–8 more or less compact, 7–8 disc-like. Antennal scape asymmetrical, hemispherical, 1.3X as long as pedicel. Pedicel subcylindrical. Antennal segment 3 shorter than pedicel. Antennal club large, 0.95 length of segments 1–8 combined. Mentum with anterior angles distinct, anterior margin angular with distinct medial point, lateral sides subparallel, overall pentagonal, flattened in lateral view.

Pronotum widest near posterior angles (L:W = 1:2.1), anterior margin broadly shallowly concave, lateral margins slightly arcuate anteriorly, anterior and posterior angles distinct. Scutellum large, obtusely triangular, apex broadly rounded. Prosternal process in lateral view with anterior and posterior ends prominent and convexity medially over procoxae with declivity behind coxal cavities; posterior apical wall prominent, straight with slight concavity. Mesoventrite extending to midway between mesocoxae, evenly concave for reception of metaventrite, convex ventrally but not carinate. Metaventrite transverse (W:L = 2.57:1). Metepisternum with slight medial constriction, oblique line dividing anterior 0.1. First abdominal sternite with broad process between metacoxae. First sternite 2X’s longer than second. Sternites 2–4 subequal. Hypopygidium subequal to first sternite.

Protibia with apical tooth distinct, longer than tarsomere 1. Outer apical notch with 100° angle, notch depth shallow, equal to tarsomere 1. Inner apical spine subequal to tarsomere 1 and part of 2 combined. Protibia not heavily armed but with stiff setae along inner apical margin. 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 armature similar to mesotibia, lateral setae somewhat longer.

Male genitalia well-sclerotized. Anal sclerite with distinct apical point (Fig. 39), ventrally with broad medial concavity approaching apex in a truncate manner. Spiculum gastrale with narrowly rounded lateral flanges, medial margins convex, short stiff setae originating from apex (Fig. 80). Tegmen broadly rounded to truncate apically (Fig. 123), longer than wide (w:l = 1:2.56), lateral row of setae visible from median fossa to prior to apex, broad shallow concavity in apical 0.33, inner row of setae not attaining apex. Median lobe large and elongate, 0.75 length of tegmen, apex acuminate, apical opening well-developed (Fig. 166), lateral margins slightly angulate becoming wider posteriorly. Ejaculatory rods not fused to each other or to basal piece, straight and subparallel. Basal piece of internal sac sclerites not fused to each other, deeply cleft in apical 0.66 (Fig. 207).

Female genitalia moderately sclerotized. Paraprocts not broadly flanged with sclerotization along median line to baso-lateral angles. Gonocoxite with two basal lateral prominences, basal ridge well-sclerotized. Gonocoxal apices without recurved “tooth” and intragonocoxal invagination shallow and narrow. Four elongate setae originate from small depressions on gonocoxal apices (Fig. 245).

Variation. Specimens from Ceylon have slightly longer dorsal pubescence than specimens from India /

Biró, however all other characters are consistent.

Seasonality/Habitat. Specimens from Ceylon were collected in June, and the species is likely also known from more tropical regions of India.

Distribution. India and Ceylon.

Notes. No host records known.


Museum National d'Histoire Naturelle


National Museum of Natural History, Naturalis