Cilicydnus Yao, Cai & Ren

Yao, Yunzhi, Cai, Wanzhi & Ren, Dong, 2007, The first fossil Cydnidae (Hemiptera: Pentatomoidea) from the Late Mesozoic of China, Zootaxa 1388, pp. 59-68 : 60-61

Genus Cilicydnus Yao, Cai & Ren , gen. nov.

Type species. Cilicydnus robustispinus Yao, Cai & Ren , sp. nov.

Diagnosis: Body length ranging 5.9–6.1 mm, oval, dorsum of head, pronotum, scutellum, and corium with long dense setae. Head semicircular, wider than long, without primary setae on the margins of the head, shorter than pronotum; rostrum arising from apex of head, extending beyond posterior margin of pronotum, 4­ segmented, first and second segments thickest, third nearly as long as fourth; eyes large, round, touching anterior margin of pronotum; antenna 4­segmented, shorter than head and pronotum combined, first segment shortest, second longest, third nearly as long as fourth, fourth fusiform, thickest. Pronotum trapezoidal, strongly transverse, anterior angles bulging forward, without collar; scutellum transverse, about 2 times as wide as long, slightly shorter than pronotum at midline; femora stout, distinctly thicker than corresponding tibiae, tibiae with dense stout spines, tarsus 3­segmented, tarsomeres subequal in thickness, first shortest, third longest; mid and hind coxae narrowly separated, coxa and trochanter rounded triangular, fore and mid femora subequal to corresponding tibiae in length, hind leg longer than mid leg, hind femur distinctly shorter than hind tibia; hemelytron macropterous, apical margin rounded, extending beyond tip of abdomen, corium with deep median fracture, clavus large, claval commissure shorter than scutellum. Abdomen wider than pronotum; ovipositor long, not projecting beyond last paratergites, extending through last two abdominal segments.

Distribution. China.

Etymology: The generic name is a combination of the Latin cili (“cilia”) and Cydnus (the type genus of Cydnidae ).

Remarks: The new genus can be assigned to the family Cydnidae by the following combination of features: head semicircular, more widened; anterior angles of pronotum bulging forward, tibiae with dense and stout spines. This genus can be easily placed in Amnestinae because of the distinct claval commissure. The new genus is distinguished from the extant amnestine genus Amnestus Dallas , in the dorsum of head, pronotum, scutellum, and corium with dense and long setae (vs. with a few setae), anterior margin of head without primary setae (vs. with primary setae).

Among all fossils of Cydnidae , the new genus is most closely related to Latiscutella Pinto & Ornellas, 1974 , but the new genus differs from the latter in ratio of first segment to second of antenna about 4:9 (vs. 5: 14), dorsum of head, pronotum, scutellum, and corium with long dense setae (vs. without setae), pronotum about 3 times as wide as long (vs. about 2 times as wide as long), and scutellum very transverse, about 2 times as wide as long (vs. slightly wider than long).