Ceresium svetlanae Kasatkin, 2023

Kasatkin, D. G., 2023, A new species of Ceresium Newman, 1842 (Coleoptera, Cerambycidae) from Thailand, Far Eastern Entomologist 476, pp. 20-24 : 21-24

Ceresium svetlanae Kasatkin , sp. n.

https://zoobank.org/NomenclaturalActs/ FF09420E-E534-4404-B0DA-C2DDD3FD8B50

Figs 1–9

TYPE MATERIAL. Holotype – 1 ♂, Thailand: Nakhon Ratchasima Prov., Nong Bun Mak distr., Nongbunnak , 14º40ʹ52.0ʺ N, 102º27ʹ08.5ʺ E, 20–21.III 2020, leg. D. Kuleshov ( ZIN) . Paratypes – 19 ex., same labels as holotype: 1♀ ( ZIN) , 3♂ ♀ ( PCDK) , 9 ♂ ♀ ( PCKD) , 6 ♂ ♀ ( PCAK) .

DESCRIPTION. Body length 6.5–12 mm, humeral width 1.7–2.5 mm. Body black, shining; mouthpart (excluding mandible apex), antennae, tarsi, last visible ventrite redbrown. Vestiture presented by sparse hairs and dense tomentose cover from white scales on pronotum and basal half elytra, and scaly setae on other body parts.

Head densely and coarsely sculptured, sculpture on occiput smoothed, with sparse semierect light-brown hairs; genae very short, almost absent; eyes very large, coarse faceting; antennae relatively long, 9th antennomere reaching apex of elytra; 4th antennomere slightly shorter than 3rd and distinctly shorter (1.4 times) than 5th; scape coarsely punctured. The ratio of length of 3rd and 4th antennomeres – 1.11 in males and 1.25 in females; 5th and 4th antennomeres – 1.45 in males and 1.65 in females.

Pronotum 1.37–1.58 times longer than wide at base; slightly widened behind middle; very densely and coarsely punctured ( Fig. 3 ); punctures on disc and sides rounded or oval, at base – transversal, almost vermiculated; surface under white scales in basal edge with smoothed sculpture; in middle of basal part of disc often with thin glabrous line. Pronotum with 4 dense, hiding sculpture, white spots in basal and apical edge: triangular in distal and crescent-shaped in proximal; with recumbent fine light hairs on disc and some erect hairs on sides. Prosternum glabrous, sculpture almost absent.

Scutellum ellipsoidal densely covered with white hairs. Elytra 2.8–3.1 times as long as broad at base; parallel-sided, their apices separately rounded; sparsely, largely punctured in basal half and with smoothed sculpture in apical half; basally with slightly granulated sculpture. White scales forming three transversal fascia on elytra: at basal third, behind middle and at apical third. Elytra with long erect brown setae along entire length.

Abdominal ventrites (visible) I–IV with dense white hairs on sides, apical angles of sternites with large white spots; mesepisterna, mesepimera, metepisterna and lateral margin metasternum with dense white tomentose cover; prosternum anteriorly and procoxae with pair of white tomentose spots ( Fig. 4 ).

Femora claviform, with sparse white hairs. Legs with long erect and semierect setae. Apex of last tarsomere with large hook-shaped spine ventrally ( Fig. 5 ).

Male genitalia ( Figs 6–9 ) with median lobe strongly sharpened apically; lateral lobes short, distinctly sharpened apically, strongly widened at base; apical sclerite of endophallus small, paddle-shaped, with three apices; ventrite VIII almost parallel-sided, weakly emarginated apically.

Female with more robust body and antennae slightly shorter than in male ( Fig. 2 ).

Variability in body coloration and characters of elytral bands not found; slight difference among specimens is noted in the antennal length.

HABITAT. All beetles were collected at UV-light in dry deciduous/semi-deciduous broadleaf forest ( Fig. 10 ).

DIFFERENTIAL DIAGNOSIS. The new species is characterized by an unusual appearance that distinguishes it from other species of the genus. To the new species is similar to C. leucostignum White 1855, but latter differs in rufous legs and a different pattern of elytra, formed spots (not transverse bands). Ceresium clytinioides Yokoi, Makihara et Noerdjirto, 2019 with black body coloration and transversal elytral bands was described from Borneo, but it has short and wide pronotum and a different white tomentose pattern. In addition, the character of coloration makes the new species similar to the representatives of the genus Teladum Holzschuh 2011 , in particular T. insolens Holzschuh 2011 . However, a different shape of the pronotum, long antennae and shape of head do not allow assigning a new species to the genus Teladum . Pronotum of the new species is as long as in Stenodryas Bates, 1873 , but the sculpture is different.

ETYMOLOGY. This new species is dedicated to Svetlana Oplachko – wife of Alexey Korshunov, who collected part of the series of this new species.

Figures

Figs 1–5. Ceresium svetlanae sp. n. (1, 3–5 – holotype, male), (2 – paratype, female). 1, 2 – habitus, dorsal view; 3 – pronotum and base of elytra, dorsal view; 4 – habitus, lateral view; 5 – last tarsomere, lateral view.

Figs 6–9. Male genitalia of Ceresium svetlanae sp. n. (paratype). 6 – ventrite VIII; 7 – median lobe with endophallus; 8 – lateral lobes; 9 – apical sclerite of endophallus.

Fig. 10. A habitat of Ceresium svetlanae sp. n. – dry deciduous/semi-deciduous broadleaf forest.