Cadoderus grebennikovi Yunakov

Yunakov, Nikolai, 2012, 3535, Zootaxa 3535, pp. 1-104: 15-16

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Cadoderus grebennikovi Yunakov

sp. n.

Cadoderus grebennikovi Yunakov   , sp. n.

(figs 5–6, 88–101, 365)

Diagnosis. Similar to C. bellus   and C. olivaceus   sp. n. From C. bellus   this new species differs by subocular row consisting of 4–6 setae (in C. bellus   3–4 (rarely 2) setae); metatibiae with large grooming brush; hairs long; pronotum with deep-brown background and 5 longitudinal (1 discal, 2 dorso-lateral 2 lateral) green stripes; rostrum weakly elongate [RL/RW average: 1.15; in C. bellus   —1.21], lateral carinae broadly strongly convex; eyes smaller [FW/ELD: 1.14–1.43 (1.30)]; median lobe longer than apodeme; apex of median lobe without dorsal process; aggonoporium shorter. From C. olivaceus   sp. n. and C. burundi   sp. n. it differs by metatibial grooming brush consisting of long hairs; background color of body vestiture deep-brown, strongly developed green striation of pronotum and elytra; pronotum rather transverse [PL/PW: 0.77–0.78 (0.775)].


Measurements. BL: 2.92–3.61 (3.30) mm, BW: 1.30–1.76 (1.58) mm, BH: 1.28–1.68 (1.51) mm.

Vestiture. Body densely covered only with overlapping, round scales, setose. Setae of head form oblique rows along lateral edges of epifrons (recumbent or subrecumbent) and above the eyes (erect). Subocular row consists of 4–6 setae. Temples with broad bare stripe. Posterior setal fringe consists of round, recumbent, plumose setae, not hidden by posterior edge of pronotum. Elytral intervals 1–6 with distinct row of setae. Anterior half of elytra with rather short suberect setae (half as long as interval width), posterior declivity with rather long, strongly erect, thick, acute or truncate spatulate setae (as long as interval width). Ventrites densely squamose, anal ventrite with apical setal comb. Antennal scape setose and densely squamose; scales round; setae long, slender, acute, and erect. Funicle setose, without scales. Metatibiae with large grooming brush; hairs long. Tarsi setose and squamose.

Coloration. Background scaling deep-brown; striped pattern formed by green scales. Dark and pale scales both with slightly pronounced pearl shine. Head dorsal surface brown, with green stripes around eyes and antennal sockets; temples, anterior portion of epifrons, and pterygia green. Pronotum with deep-brown background scaling and 5 longitudinal (1 discal, 2 dorso-lateral 2 lateral) green stripes. Elytra background scaling deep-brown. Intervals 1, 3, 5, 7–11 green. Stripes on intervals 3 and 5 interrupted. Intervals 2, 4, 6 with scattered green scales. Genae, meso-and metapleura green; meso- and metasternum and abdomen cupreous. Femora browncupreous, middle portion with oblique deep-brown bands. Tibiae external surface grayish-cupreous.

Head. Rostrum weakly elongate [RL/RW: 1.13–1.19 (1.15)], parallel-sided. Pterygia not extended beyond contour of rostrum. Lateral carinae broadly strongly convex. Epifrons significantly narrowed from base to the level of antennal socket, than sharply sinuate, at the level of antennal articulation 2 x narrower than vertex, distinctly sloping at sides, with distinct median carina. Transverse sulcus deep, concealed by dense scaling at dorsal surface and at sides. Anterior portion of epifrons not steep, without median sulcus. Frons not declivous, glabrous, bare. Epistome convex, broadly arcuate, delimited by narrow carina. Eyes sublateral, broadly oval, moderately convex, highest at the middle [FW/ELD: 1.14–1.43 (1.30)]. Vertex broad, flat. Frontal fovea concealed by scales.

Antennae. Scape extended behind anterior edge of pronotum, evenly curved and widened. Funicular segment 1 as long as 2nd; 3rd–7th oblong.

Thorax. Pronotum strongly transverse [PL/PW: 0.77–0.78 (0.78)], evenly slightly convex at sides, constricted at apex, widest at middle. Disc weakly convex longitudinally and transversally. Tergosternal suture concealed by scales. Metanepisternal suture concealed by scales, obsolete behind.

Elytra. Elytra broadly-ovate [EL/EW: 1.32–1.40 (1.36)], in male oval; anterior edge arcuate, vertical narrowly rounded; disc in male not convex, in female strongly convex [EL/BH: 1.40–1.43 (1.42)]. Subscutellar callosity interrupted, partly hidden by scales, with 2 tiny tubercles. Elytral intervals flat. Anterior portion of 1st striae with regular row of tiny tubercles.

Legs. Protibiae and mesotibiae strongly curved, not widened at the apex. Interior edge C-shaped, without teeth in distal portion. Metatibiae with small teeth. Mucro on meso- and metatibiae large, thorn-shaped, acute. Setal comb of protibiae consists of dense 10–14 black short setae weakly extending beyond external edge of tibiae. Bevel of metatibiae narrowly enclosed; its surface bare. Tarsi robust; tarsomere 2 triangular, as long as wide; tarsomere 3 with two wide lobes; tarsomere 5 of metatarsus extending beyond apical lobes of 3rd by length of the last one.

Abdomen. Posterior margin of 1st ventrite straight. 2nd ventrite 1.5 x as long as 3rd one, posterior margin of 2nd ventrite straight. 5th ventrite in male flat, in female weakly convex near the apex; apical edge in male broadly rounded, in female acute.

Male genitalia. Median lobe parallel-sided, lateral edges not fused, not tubular, in apical 1/3 evenly narrowed anteriorly; apex attenuate, acute, strongly laterally compressed; 1.3 x as long as apodeme. Internal sac without spiculate fields, with large, long aggonoporium consisting of two stick-shaped symmetrical lobes connected proximally by transverse bridge and long ventral thick process. Ostium absent. Ligulae sclerotized. Parameres long, fused in base, basal piece of tegmen narrow, tegminal apodeme 0.75 x as long as apodemes of median lobe.

Female genitalia. Coxites heavily sclerotized dorso-ventrally curved, with heavily sclerotized dorsal baculi, evenly covered with pores, without sensilla. Styli well developed, stick-shaped, bearing 1 seta. Spermatheca moderately sclerotized, with short broad ramus, collum slender, as long as ramus. Corpus large, slender; cornus thick, extended beyond corpus. Tergite 8 subtrapezoid, with curved fringe of tenuous multiple long setae at the apex. Sternite 8 thick. Lamella sharply narrowed and acute, without setae, knife-shaped, heavily sclerotized. Apodeme thick; caput small.

Distribution. Tanzania: Nguru Mountains ( Fig. 365).

Bionomics. Montane rain forests.

Material examined. Tanzania: Holotype   ♂, dissected ( CNC) “ Tanzania, Morogoro Reg., Nguru Mts. at Turani , h = 1236 m 06°06'24''S, 037°31'48''E, sifting05, V. Grebennikov leg., 03.XI.2010 ” GoogleMaps   . Paratypes: 2♀ ( CNC) labeled as holotype   .

Etymology. The name is dedicated to the coleopterologist Vasily Grebennikov (CNC) in recognition of his contribution to the knowledge of weevils of the East Africa.


Canadian National Collection of Insects, Arachnids, and Nematodes