Pocadius antennuliferus Cline, 2008

Cline, Andrew R., 2008, Revision of the sap beetle genus Pocadius Erichson, 1843 (Coleoptera: Nitidulidae: Nitidulinae, Zootaxa 1799 (1), pp. 1-120 : 26-31

Pocadius antennuliferus Cline new species

(Figs. 3, 45, 86, 129, 172)

Specimens examined. HOLOTYPE ♂ ( CMN): BRAZIL: Pará; Carajas, Serra; Norte , III-1985; 6 15’S 50

75’W; N. Degallier; FIT, carrion, dung.

Diagnosis. Distinguished from other Neotropical Pocadius by: head surface deeply punctate, interspaces shining and completely smooth; protibial outer apical notch deep; prosternal process with steep posterior declivity and short posterior wall (lateral view), terminal antennomere enlarged and asymmetrical with two lateral depressed regions, metasternal disc with faint minute punctures; tegmen with incomplete rows of inner and lateral setae, median lobe with apex narrowly rounded, and ejaculatory rods comprised of three distinct pieces.

Description. Length 3.1mm, Width 2.4mm, Depth 1.3mm. Body moderately convex, surface shining, dark reddish-brown, legs and antennae lighter. Dorsal and ventral pubescence fine and inconspicuous.

Head surface deeply, irregularly punctate, punctures larger on vertex, becoming smaller towards orbits and fronotclypeal region; large punctures 3–4X diameter eye facet, smaller punctures 2X diameter eye facet; interspaces smooth and shining. Pronotal surface with large punctures equal to large punctures on head, interspersed with relatively few small punctures, equal to smaller ones on vertex; interspaces alutaceous to finely microreticulate, large punctures 0.5 diameter apart. Scutellar surface with few vague shallowly impressed small punctures equal to smaller ones on vertex, interspaces alutaceous to granular. Elytra with serial rows of large and small punctures; small punctures 1.5 diameter of smaller ones on pronotum, and large punctures 1.5–2 diameters of small ones. Small punctures giving rise to straight erect fine setae, large punctures with decumbent fine setae; interspaces narrow between punctures of a row and between different rows; within a row, small punctures separated by 0.75 diameter, and large punctures by 0.5 diameter. Large punctures rows separated by 1.0–1.5 diameter; interspaces moderately shining, alutaceous to finely microreticulate. Pygidium densely punctate, interspaces narrow, 0.5–0.75 diameter, alutaceous to granular.

Venter with similar short fine dispersed pubescence as dorsum. Mentum with small shallow scattered punctures, equal to smaller ones vertex; interspaces smooth to finely alutaceous. Submentum and gula similar in punctation to mentum but more widely dispersed. Prosternum and epimeron deeply irregularly punctate, punctures 2X larger than large ones on vertex, interspaces granular with microreticulate areas, prosternal punctures separated by 0.5 diameter, those on epimeron by 0.5–0.75 diameter. Mesoventrite shallowly punctate, 0.5 diameter of those on prosternum, interspaces alutaceous to granular, separated by 0.5–1 diameter and aggregated near metaventrite. Metaventrite irregularly punctate with faint small punctures on disc similar to smaller ones on vertex and larger punctures equal to those on prosternum, interspaces faintly alutaceous on disc becoming granular with microreticulate areas laterally, disc punctures separated by 2–4 diameters and lateral punctures by 1 diameter. Abdominal sternite 1 with small faint, almost obsolete punctures, punctures equal to smaller ones on vertex, interspaces alutaceous, separated by 1–2 diameters. Hypopygidium with deeper punctures than other sternites, similar to those on sternites 2–4, interspaces alutaceous to granular, punctures separated by 1–2 diameters.

Head wider than long (W:L = 1.5:1). Antennal club compact, swollen apically, distinctly asymmetrical with last antennomere larger than 9–10 combined. Antennomeres 4–8 compact, 6–8 disc-like. Antennal scape asymmetrical, hemispherical, subequal to pedicel. Pedicel cylindrical. Antennal segment 3 subequal to pedicel. Antennal club large, 0.85 length of segments 1–8 combined. Mentum with anterior angles distinct, pentagonal, flattened in lateral view.

Pronotum widest in posterior third (L:W = 1:2.1), anterior margin broadly concave, lateral margins arcuate anteriorly, posterior angles indistinct. Scutellum large, triangular, apex acuminate. Prosternal process in lateral view with posterior third having a well-defined declivity, and anteriorly with well-developed carina, posterior face reduced. Mesoventrite small, extending to midway between mesocoxae, evenly concave for reception of metaventrite. Metaventrite wider than long (W:L = 3:1). Metepisternum with slight medial constriction, oblique line dividing anterior 0.125. First abdominal sternite with narrowed process between metacoxae. First sternite 2X length of sternite 2. Sternites 2–4 subequal. Hypopygidium subequal to sternite 1.

Protibia with apical tooth prominent, longer than tarsomere 1; outer apical notch with 110° angle, notch depth moderate, equal to length of tarsomere 1; inner apical spine short, 0.75 length tarsomere 1. Mesotibia more heavily armed than protibia with numerous dense stiff setae and row of slender spines along lateral edge. Outer apical process small, subequal to protibial process; inner apical spine equal to tarsomeres 1–2 combined. Metatibia with armature similar to mesotibia, outer apical process well-developed, subequal to tarsomeres 1–2 combined.

Male genitalia well-sclerotized. Anal sclerite with apex somewhat fimbriate (Fig. 3); ventrally with broad medial fossa approaching apex in convex manner. Spiculum gastrale with wide narrowly curved lateral flanges, medial margins slightly concave, long stiff setae originating from apex (Fig. 45). Tegmen evenly rounded (Fig. 86), longer than wide (w:l = 1:2.3), lateral row of setae visible from median fossa to prior to apex, large shallow concavity in apical 0.33. Median lobe moderately robust, 0.4 length of tegmen, apex narrowly rounded, apical opening well-developed (Fig. 129). Ejaculatory rods not fused to basal piece or each other, elongate and comprised of three distinct pieces (Fig. 172).

Variation. None observed.

Seasonality/Habitat. Holotype collected in March.

Distribution. Known from type locality.

Notes. No fungal host known.

Etymology. Specific epithet denotes the greatly enlarged terminal antennomere with distinct sensillar regions.