Ceresium crassum, Yokoi, 2023

Yokoi, Yaheita, 2023, Note on genitalia and taxonomy of the Callidiopini from the Philippines, with description of six new species and two subspecies (Coleoptera, Cerambycidae, Cerambycinae), Contributions to Entomology 73 (1), pp. 31-66 : 31

Ceresium crassum sp. nov.

Figs 12A-F , 31A, B

Type material.

Holotype ♀ (SMF): "Mt. Makiling, 31.I. 1986, Y.Taguchi, from Almon". (former CHM).

Etymology.

The name of this species refers to the large and stout body.

Diagnosis.

Large. Antennae short. Body colour brownish; femora bi-coloured. Setae on head, pronotum and sides of abdomen erect to sub-erect.

Measurements.

Holotype ♀: TL = 17.5 mm; EL/TL = 0.68; EL/EW = 2.86; HW/PW = 0.78; PL/PW = 1.04; PA/PW = 0.64; PB/PW = 0.86.

Description.

Body colour reddish dark brown; pronotum, head, antennae and tibiae darker. Femora reddish brown; apices blackened. Setae whitish.

Head narrower than pronotum; glossy; punctures dense, large, deep, setiferous; setae stout, curved, sub-erect, disorderly, pointing to different directions. Frons transverse, reversed-sub-trapezoidal, not steep; the apical middle weakly elevated, sparsely punctured; apical corners sub-reticulate. Vertex flattened, feebly concave. Punctures on occiput large near eyes, obtuse otherwise. Eyes separated from one another by half the width of occiput or twice of the upper eye-lobes. Antennal supports flattened; punctate and setose. Antennae short, hardly reaching the 5th sternite; antennomeres III and IV each 4/5 as long as scape; V and VI equally as long; VII-XI gradually decreasing in length; XI as long as scape. Scapes sub-cylindrical; slightly arcuate.

Pronotum slightly longer than broad, well rounded; sides almost evenly arcuate; punctures dense and regular; median stripe short and narrow; setae stout, curved, erect to sub-erect.

Elytra feebly tapering toward apices; basal middle elevated; punctures dense and regular, apically attenuating; setae short and curved.

Legs: Femora clavate from base; bi-coloured; apices blackened and obtusely punctured.

Venter (Fig. 12B, D ): Prosternum weakly impressed in the middle, concave in lateral view. Punctures large and regular; setae dense, curved, recumbent. Prosternal process narrow, constricted; apically expanded, bent downward; apical middle thinned, apex weakly arcuate, fringed with fine setae. Mesoventrite saddle-shaped; sharply elevated toward the process; punctures large; setae sparse in the middle, dense and adpressed near sides. Mesoventral process broad, flattened; apically bi-lobed; each lobe well-rounded. Metaventrite apically slightly dilated; setae sparse in the middle; dense and adpressed otherwise. Abdomen glossy; punctures obtuse; setae curved, adpressed; additional setae near sides longer, erect; sternites 3-6 gradually attenuating. 7th sternite longer than the preceding, rounded; setae fine.

Female genitalia (Figs 12E, F , 31A, B ). Blade of 8th sternite reversed sub-trapezoidal; apical setae short to medium; peduncle twice as long as blade. 8th tergite sub-squarish, broader than sternite; apices of 8th sternite and tergite both thickened; 9th sternite short and broad; coxite nearly as long as paraproct. Vaginal plates moderately arcuate. Spermatheca kidney-shaped, connected with a long, narrow vessel to vagina; bursa copulatrix connected so with a short tube.

Distribution.

Luzon, Philippines.

Comparative notes.

The new species is comparable to Ceresium furtivum Pascoe, 1869, from the Sunda Islands. However, it is much larger, and its antennae distinctly shorter. Further, its setae on head, pronotum and abdomen are erect to sub-erect instead of recumbent. In addition, the coloration pattern of femora is distinct, rather resembling the sympatric Ceresium femoratum Aurivillius, 1927. The latter differs, however, in other essential characters such as structure of body, legs and punctures. As to female genitalia, its 8th sternite and tergite are shorter than those of C. furtivum , not parallel-sided. Setae and puncture thereupon are also different. Above all, their apices are thickened (Figs 12E , 31A, B , 32A-C ).

Figures

Figure 12. A-F. Ceresium crassum sp. nov. Holotype female. A. Habitus, dorsal view; B. Ditto, ventral; C. Pronotum; D. Prosternum and mesoventrite; E. 8 th sternite-tergite, apices, frontal view; F. Genitalia, clockwise from top: median oviduct; vaginal plates; bursa copulatrix; spermatheca; vagina; far left: 9 th sternite.

Figures 31, 32. 31 A, B. Ceresium crassum sp. nov. Holotype female. 31 A. 8 th sternite, ventral view; 31 B. 8 th tergite, dorsal view. 32 A-C. Ceresium furtivum Pascoe. Female from Borneo. 32 A. 8 th sternite, ventral view; 32 B. 8 th tergite, dorsal view; 32 C. Spermatheca. Scale bars: 1 mm (31 A, B; 32 A-C).