Adoretus ( Chaetadoretus ) bjornstadi, Limbourg, 2016

Limbourg, Pol, 2016, Contribution to the knowledge of Afrotropical Rutelinae IV (Coleoptera: Scarabaeoidea: Melolonthidae), Belgian Journal of Entomology 38, pp. 1-42 : 1-42

publication ID	https://doi.org/10.5281/zenodo.13272672
publication LSID	lsid:zoobank.org:pub:DB865223-60B6-4839-B6AB-27501BC9382E
persistent identifier	https://treatment.plazi.org/id/03DB8C1B-FFB8-7708-FE78-7DA3719CED62
treatment provided by	Felipe
scientific name	Adoretus ( Chaetadoretus ) bjornstadi
status	sp. nov.

Treatment

Adoretus ( Chaetadoretus) bjornstadi View in CoL sp. nov.

( Figs 61-62, 65-66)

TYPE MATERIAL. Holotype ♂: [ Coll. I.R.Sc.N.B., KENYA, Tsavo East N. P., Buchuma , 03.I.1983, Leg. A. Bjornstad] ( RBINS).

Paratypes: 1♂: [ Coll. I.R.Sc. N.B., KENYA, S.E., Mackinon Road (A109), 14.IV.2004, Leg. M. Snizek] ( RBINS) ; 1♂, 1♀: [ KENYA: Southern shore of Lake Magadi, 2000ft, 1- 2.IV.1956, B. Verdcourt] [at light] [ Brit. Mus. 1956-239] ( BMNH) ; 1♂: [ Oloitokitok ( Nairobi), 30.XII.1965, arbocco] [ Museo Civico di Genova] ( MCSN) ; 1♂: idem ( RBINS) .

DESCRIPTION

Male

Measurements and ratios ♂ (n = 3): LB: 12.5 – 13.5 mm, lB: 6 – 6.5 mm; LB/lB: 1.72; LP/lP: 0.50; LE/lE: 1.32.

Body: laterally slightly convex, relatively elongate, slightly bent, broader in middle of elytra; abdomen concave; process at base of prosternum rounded; entirely brownish-black, slightly shining.

Head: broad, clypeus rounded, entirely reflexed, clypeus and vertex totally covered with tubercles; frons unpunctuated; antennae 10-segmented, with club as long as flagellum.

Thorax: pronotum rectangular, broader than long; sides uniformly rounded from base to apex, with all margins carinate except middle of anterior margin; anterior angle slightly projecting and reaching posterior margin of eyes; strongly striated transversely.

Scutellum triangular with rounded sides and crescent shaped points.

Elytra: longer than broad; epipleura complete; costae obsolete; intervals with close crescent shaped points (only visible if setae missing); humeral calli marked; apical calli rounded and slightly projecting postero-ventrally.

Pygidium: laterally rounded, carinate along anal plate; not projecting postero-ventrally and not surpassing apex of elytra; transversely striated.

Legs: protibiae tridentate; pro-and mesotarsal larger claw cleft; metatarsus with larger claw twice longer than smaller and uncleft.

Hairs: upper and underside densely covered with short, decumbent white scales;

elytra with lines of small glabrous rounded zones with, in the middle of each, separated, erected, white or yellowish setae; long, erected yellowish-brown setae on all margins from canthus to apex of elytra, sparse on underside; erected white squamous setae on disc of pygidium.

Aedeagus: in lateral view, parameres elongate, dorso- and ventrally sinuate, apex pointed; in dorsal view, parameres laterally sinuate, strongly sinuate to apico-internal angle.

Female

Measurements and ratios ♀ (n = 1): LB: 13 mm, lB: 7 mm; LB/lB: 1.71; LP/lP: 0.51; LE/lE: 1.31.

Differs from ♂ by: laterally more convex and abdomen convex.

DERIVATIO NOMINIS. Dedicated to Mr Anders Bjørnstad ( Skien, Norway) who collected the holotype .

DISTRIBUTION. Known from Kenya.

BIOLOGY. The species was collected in December, January and April. DIAGNOSIS. A. ( Chaetadoretus) bjornstadi sp. nov. is extremely similar to A. ( Chaetadoretus) hassoni Limbourg, 2011 but can be distinguished as follows: