Sebasmia ceylonica Miroshnikov, 2022

Miroshnikov, A. I., 2022, The longicorn beetle tribe Cerambycini Latreille, 1802 (Coleoptera: Cerambycidae: Cerambycinae) in the fauna of Asia. 18. The members of the genus Sebasmia Pascoe, 1859 from Sri Lanka, with the descriptions of two new species, Russian Entomological Journal 31 (2), pp. 154-158 : 156

Sebasmia ceylonica Miroshnikov , sp.n.

Figs 2, 5, 11 –12, 14, 17, 20, 22, 24, 27.

MATERIAL. Holotype, ♂ ( BMNH) ( Fig. 2), “ Ceylon ”, “Fry Coll. 1905.100”, “Ex Mus Parry”, “43082”, “ Sebasmia? testacea Gahan , ♂ ” ( Fig. 11) + “ Holotypus ♂ Sebasmia ceylonica sp.n. det. A. Miroshnikov 2022”.

DIAGNOSIS. This new species resembles S. testacea , but differs by the structure of the elytra, in particular, the distinctly rugose sculpture in the middle of the base, the rounded apical external angle, as in Fig. 27 (in S. testacea this angle protruding tooth-shaped, as in Fig. 26); the structure of the pronotal disc, in particular, the coarser sculpture, the peculiar recumbent light setation, as in Fig. 5 (cf. Fig. 7); the length ratio of antennomeres 1 and 3; the sharper, somewhat rugose puncturation of the metasternum; the sharper puncturation of the visible abdominal sternites; the darker coloration of the body, antennae and legs in general. Sebasmia ceylonica sp.n. can also be compared to the next new species, S. olemehli sp.n., the differences from which are given in its diagnosis.

DESCRIPTION. Male. Body length 14.6 mm, humeral width 2.7 mm. Coloration of integument mainly reddish brown tones; eyes black; femora, tibiae, and abdomen lightest.

Head with well-developed antennal tubercles; genae short; eyes very large and very strong convex; submentum with coarse punctures; neck with well-expressed transverse folds both ventrally and laterally; length ratio of antennomeres 1– 7 (8–11 antennomeres missing), 23: 6: 29: 21: 37: 42: 45 (taking into account structure of antennomeres 1–7, antennae must be distinctly longer than body); antennomere 1 mostly with a rough and coarse, dense, partly confluent puncturation; antennomere 2 subequal in length and width.

Pronotum very clearly longitudinal, 1.38 times as long as width; base 1.24 times as wide as apex; with a sharp constriction near apex; with rough and coarse, transverse, partly sinuous folds and with a strong, median, keel-shaped, longitudinal, shiny elevation located mostly in basal half, as in Fig. 5.

Scutellum triangular, truncate at apex.

Elytra strongly elongated, nearly parallel-sided, 3.76 times as long as humeral width; apical external angle rounded, sutural angle with a short tooth, as in Fig. 27; with somewhat rugose surface (especially at base) and small dense puncturation.

Prosternum mainly with more or less coarse transverse folds; prosternal process with a weakly expressed apical tubercle; mesosternal process without tubercle dorsally, between coxae about 1.6 times as wide as prosternal process; metasternum with a small, dense, partly rugose puncturation; visible abdominal sternites with a small dense puncturation, this being smaller than on metasternum; last (visible) abdominal sternite with a distinct broad emargination apically; last (visible) abdominal tergite at apex narrowly and clearly emarginate.

Legs relatively short; femora with a carina along each side, this being more or less distinct only in basal part; mesofemora ventrally with emargination and well-developed brush of very dense golden setae, as in Fig. 12, characteristic of the genus; metatarsomere 1 distinctly shorter than metatarsomeres 2 and 3 combined.

Recumbent setation on head dorsally, pronotum, and basal part of elytra with a yellowish tint, on remaining parts mostly greyish, densest mainly on head dorsally, pronotal disc, and partly on base of elytra, as in Figs 2, 5.

Genitalia in Figs 20, 22, 24.

NOTE. In the holotype, in addition to the absence of several apical antennomeres, the apex of the right elytron is strongly deformed .

ETYMOLOGY. The formation of the name of this new species is related to its distribution in Sri Lanka formerly known as Ceylon.

DISTRIBUTION. Sri Lanka. The specific localities are still unknown.