Adocimus (Belonotus) bartenevi Kirejtshuk et Kovalev, 2022

Kirejtshuk, Alexander G. & Kovalev, Alexey V., 2022, Monograph on the Cillaeinae (Coleoptera: Nitidulidae) from the Australian Region with comments on the taxonomy of the subfamily, Zootaxa 5103 (1), pp. 1-133 : 21-24

7. Adocimus (Belonotus) bartenevi Kirejtshuk et Kovalev , sp. nov.

Figs 2 , A–J

LSID urn:lsid:zoobank.org:act:2AF34B7F-23FC-4439-81B4-E91BC86075B9

Type specimens examined: Australia, QLD: Holotype, male ( ANIC) and 2 paratypes (male— ZIN and female— ANIC)—“ 13.44S, 143.20E, QLD, 11 km W of Bald Hill, Mcllwaith Range , 27 June— 12 July 1089, T.A. Weir, 520 m, search party campsite”, “ex dead Pandanus leaves”; 1 paratype, female ( ANIC)—“ 11.44S, 142.35E, Heathlands, QLD, 20 Jan.1992, T. Weir, ex Pandanus, leaves.”

Diagnosis. This new species is comparable in its body shape with Adocimus (Belonotus) nitidulus comb. nov. differing from it in the lighter body coloration (not subunicolorous dark castaneous to brownish), two more or less expressed small teeth on transverse anterior edge of the male frons, pronotum widened anteriorly, somewthat shorter and almost regularly oval antennal club (not subparallel-sided) and different proportions of other antennomeres, wider femora, longer tibiae, subtransverse (not rounded) apex of the female pygidium with another type of serration on apices of female pygidium and male anal sclerite.

Etymology. The new species is named after Alexander F. Bartenev, professor in entomology and invertebrate zoology at Kharkov State (at the moment National) University, close friend of the first author from the student time, who recently passed away (end of November 2015).

Description of holotype (male). Length of body with abdomen 5.0, length without abdomen 2.6, width 1.0, height 0.4 mm. Elongate, slightly convex to subflattened dorsally and ventrally; subunicolorous yellowish to reddish with somewhat lighter; pronotum and elytra with some infuscation (producing by hind wings under elytra); body shining; dorsum almost without pubescence, although posterior edge of pronotum with dense microsetae, dorsal abdominal sclerites glabrous, except for short and thin yellowish setae along sides, and posterior edge of anal sclerite with rather thin and long hairs; underside also scarcely pubescent, but apex of prosternal process with dense, thin and long hairs, hypopygidium with very almost inconspicuous short and sparse hairs becoming more conspicuous distally.

Head and pronotum with punctures, mostly coarser than eye facets, separated by somewhat greater than one puncture diameter, interspaces between them smooth; elytra with weak and slightly oblique striae coordinated with shallow punctures in bottom of these striae (punctures as coarse as those on head and pronotum); exposed abdominal dorsal sclerites with shallower and somewhat finer punctures than those on head and pronotum, and smoothly alutaceous interspaces between them. Prosternum and metaventrite with suboval and much finer punctures than those on head and pronotum, separated by 3–5 puncture diameters, and interspaces between punctures smooth. Abdominal ventrites with somewhat finer, denser and shallower punctation than that on thoracic underside and becoming denser on hypopygydium; interspaces between punctures smooth on ventrites 1–4 and with somewhat pronounced mesh microreticulation on hypopygidium.

Head widest at eyes and slightly arcuately narrowing posteriorly. Anterior edge of frons with one couple of paramedian teeth and with weak emargination between them. Labrum with widely rounded anterior edge, about 2.5 × as wide as long. Mandibles with bidentate apex, subtransverse anterior edge and sharply angular at side. Antennae about three fourths as long as head width, scape moderately swollen and about 2.0 × as long as each of antennomeres 2 and 3, antennomere 2 (pedicel) markedly thicker than antennomere 3, oblong club about two sevenths of total antennal length, almost 1.5 × as long as wide and with antennomeres 9 and 10 comparable in width and length, and somewhat wider and longer than antennomere 11, apex of terminal antennomere rounded.

Pronotum slightly longer than wide, somewhat widened anteriorly and subtrapezoid with slightly arcuate lateral edges, anterior edge something bi-emarginate and posterior edge slightly convex. Scutellar shield subtriangular to subpentagonal, about 2.0 × as wide as long. Elytra subparallel-sided, slightly longer than their combined width, rather steeply sloping at sides. Abdomen as wide as pronotum with segment 4 almost completely exposed dorsally, segments 5 and 6 with rather narrow, laterosternites V and VI subparallel-sided in posterior three fourths; tergite V about 2.0 × as wide as long, tergite VI somewhat longer than tergite V; postbasal lines of exposed tergites behind elytral apices sharply expressed and their lateral ends reaching posterior edge of tergites. Pygidium nearly as long as wide, subtruncate and sparsely and scarcely serrate at apex.

Pregenal processes comparatively narrow and at wide hypostomal sinuses subarcuately curved. Terminal maxillary and labial palpomeres more than 2.0 × as long as thick and subcylindrical. Mentum rather widened anteriorly and with strongly projecting anterior angles, nearly 3 × as wide as long. Arcuate antennal grooves convergent and expressed only between eyes and pregenal processes. Median plate of prosternum almost straightly widened anteriorly from prosternal process. Prosternal process strongly widened before subtruncate apex, with flattened median plate of prosternal process arcuately widening behind procoxae. Distance between procoxae as great as length of antennal club, and somewhat smaller than that between mesocoxae and somewhat greater than that between metacoxae. Metaventrite subflattened and with clear discrimen in distal two thirds. Metepisterna gradually narrowing posteriorly and at base about as wide as mesotarsomere 1. Abdominal ventrite 1 somewhat longer than ventrite 2; ventrite 3 about as long as ventrites 1 and 2 together and somewhat shorter than ventrite 4, besides, it about subequal in length with hypopygidium. Hypopygidium slightly transverse and shallowly emarginate at apex.

Pro- and mesofemora of usual shape and nearly 2.5 × as wide as corresponding tibiae; metafemur 3.0 × as wide as metatibia. Protibia somewhat wider than antennal club, comparatively coarsely serrate along outer edge, two spines along lower edge of apex and with very strong spur curved inwards. Meso- and metatibiae somewhat narrower than protibia, with one row of short and stout spines along outer edge becoming stronger distally, one largest spine at outer subapical angle and this row continuing by three greater spines along lower edge of apex approaching to two moderately thin and moderately long spur. Tarsi with widest tarsomere 1 (slightly wider than antennomere 2), following tarsomeres thinner, claws simple and narrow.

Anal sclerite with subtruncate and serrate apex bearing six teeth. Aedeagus moderately sclerotized and comparatively small, tegmen widely rounded at apex; penis trunk about as long as tegmen and widely rounded at apex, inner sac of penis with one pair of slightly sclerotized, very thin and rather long spicula (about 2.5 × as long as tegmen) joined near middle by wide commissura.

Female. Differs from male in structure of terminal abdominal segment: somewhat longer, pygidium less regularly truncate at apex with rounded lateral apical angles and bearing six small teeth along posterior edge. Mandibles are markedly more gently curved at outer edge.

Variations. Length of body with abdomen 3.7–5.1 mm. The anterior edge of the frons of another male, which is accessible for study, has only extremely weak traces of the paramedian teeth on anterior edge of frons and emargination between them. The mandibles of smaller male (paratype) are almost as shaped as those in females. Finally, some variability can be observed in punctation and sculptute of integument.

Distribution. This species is known only from type locality in QLD (Mcllwaith Range) and QLD (Heathlands).

Notes on bionomy. This new species seems to be associated with Pandamus.

Figures

FIGURE 2. Adocimus (Belonotus) bartenevi sp. nov., orig. Holotype, male from QLD (“… 11 km W of Bald Hill, Mcllwaith Range…”); A: body, dorsal; B: head and thorax, ventral; C: head, dorsal; D: drawing of anterior part of frons, dorsal; E: lateral side of abdominal segments 5 and 6, dorsal; F: male anal sclerite and spiculum gastrale, ventral; G: tegmen, ventral; H: penis trunk, dorsal; I: proximal part of inner sac with armature. Scale bars: a = 1.0 mm to Fig. A; b = 1.0 mm to figs B–C and E–F; с = 0.25 mm to Figs G–I.