Cyclosomus Latreille, 1829

Kavanaugh, David H. & Cueva-Dabkoski, Mollie, 2023, A Review of Genus Cyclosomus Latreille (Coleoptera: Carabidae: Lebiinae: Cyclosomini) in Asia., Proceedings of the California Academy of Sciences 67 (21), pp. 493-537 : 498

Genus Cyclosomus Latreille, 1829

Scolytus Fabricius, 1790:221 , in part [junior homonym of Scolytus Geoffroy, 1762 ] (type species Carabus lim-

batus Fabricius, 1801, designated by Latreille (1810:426). Fabricius (1792:180); Bousquet (2012:89).

Cyclosomus Latreille, 1829:394 (type species Carabus flexuosus Fabricius, 1775 , by monotypy).

Diagnosis. Adults of Cyclosomus species can be distinguished from those of other Asian carabid species by the following combination of character states: Body medium-sized, BL = 6.5 mm to 9.5 mm; body form broadly ovoid (e.g., Fig. 3 ), Omophron -like; head with two pairs of supraoribital setae; labrum with anterior margin deeply emarginate; mentum with medial tooth present, apically emarginate; pronotum ( Fig. 14 ) very broad, trapezoidal, almost as wide as elytra at humeral angles, distinctly widest at or near base; elytra broadly rounded apically, elytral basic color pattern as in Fig. 3B ; middle and hind tibiae with medial spurs long and serrulate ( Fig. 2A ); front tarsomeres 1 to 3 markedly expanded laterally ( Figs. 2B, C ) in both males and females; middle tarsomeres 1 to 3 broad and with pads of adhesive squamosetae (Stork 1980) ventrally in males ( Figs. 2D, E ), narrower and without ventral setal pads in females.

Diversity: At present, six species are recognized in the Afrotropical Region and seven species in the Asian fauna. We here recognize nine Cyclosomus species as occurring in Asia, with two of these new to science.

Figures

FIGURE 3. A. Illustration of measurements recorded. EL = elytral length; EW = elytral width; HL = head length; PL.= pronotal width; PWA = width between apices of apical angles of pronotum; PWM = width across widest part of pronotum. B. Illustration of terms used for describing the dark color pattern in Cyclosomus species (example image is of a widespread African species, Cyclosomus buqueti Kolbe). bdb = basal dark band; ldb = longitudinal dark band; lpb = lateral pale band of pronotum; mdb = middle transverse dark band; pas = preapical dark spot.

FIGURE 14. Pronota, Cyclosomus spp., dorsal aspect. A. C. acutangulus Kavanaugh and Cueva-Dabkoski (Bhalukpong, Arunachal Pradesh, India); B. C. flexuosus (Fabricius) (Hetauda, Bagmati Province, Nepal); C. C. inustus Andrewes, holotype (Hong Kong, China); D. C. marginatus Motschulsky (India); E. C. pallidus Kavanaugh and Cueva- Dabkoski sp. nov. (Karachi, Sindh Province, Pakistan); F. C. philippinus Heller (Pili, Zambales Mountains, Luzon, Philippines); G. C. sumatrensis Bouchard (Taman Negra National Park, Pahang, Malaysia); H. C. suturalis (Wiedemann), lectotype (“Bengala”, India); I. C. vespertilio Cueva-Dabkoski and Kavanaugh sp. nov. Scale lines = 0.5 mm.

FIGURE 2. Parts of legs, Cyclosomus acutangulus Kavanaugh and Cueva-Dabkoski (Longchuan Jiang at Longjiang Bridge, Wuhe Township, Tengchong County, Yunnan, China). A. Left hind tibial medial spur and tarsomere 1, dorsal aspect; B,C. Male front tarsus, B. ventral aspect, C. dorsal aspect; D,E. Male middle tarsus, D. dorsal aspect, E. ventral aspect. Scale lines = 0.2 mm.