Ctenoblatta Qiu, Che and Wang, 2018

Qiu, Lu, Che, Yan-Li & Wang, Zong-Qing, 2018, Contributions to some Corydiinae genera (Blattodea: Corydioidea: Corydiidae) from China, Journal of Natural History (J. Nat. Hist.) 52 (21 - 22), pp. 1433-1461 : 1452

Ctenoblatta Qiu, Che and Wang gen. nov.

Type species

Ctenoblatta impubis Qiu, Che and Wang sp. nov. – here designated.

Diagnosis

This new genus is unique in the subfamily Corydiinae for its pectinate antennae. The male of the new genus superficially resembles the male of the genus Homoeogamia in the following characteristics: (1) postclypeus small, strongly protruding; (2) arolia absent ( Figure 3t , Grandcolas 1994); (3) pronotum wider on the fore border ( Figure 3g ; Grandcolas 1997b); (4) supra-anal plate lengthened, median emarginated ( Figure 8a ; Grandcolas 1994); and (5) wings with single RA, M straight, branched distally ( Figure 10c–d ); but the former can be distinguished from the latter by the following characters: (1) body unicoloured, while Homoeogamia with hyaline guttatus spots on tegmina; (2) antennae distinctly pectinate, while not pectinate in Homoeogamia ; and (3) subgenital plate more protruded, lateral corners of hind margin more angular, while subgenital plate narrower, lateral corners round in Homoeogamia .

Generic description

Male. median size, body weakly pubescent. Eyes very large, plump, ocelli distinct, antennae pectinate ( Figure 8i ). Pronotum thickened, unicoloured, heavily punctate, with very fine and small pubescence, which cannot be seen by the naked eye, but only using a microscope. Tegmina thickened, Sc swelling present ( Figure 3i ), wings hyaline. Legs with short spines, front femur type C 1, pulvilli absent, tarsal claws without arolia ( Figure 3t ). Supra-anal plate hyaline, strongly protruding, greatly exceeding the end of subgenital plate, median of the apex emarginated, cerci with spheroid sense organs present ( Figure 8g ). Subgenital plate nearly trapezoidal, median concave, styli very small, situated at the corners of the posterior margin. Left phallomere with L1 irregular, left part with a long process; L2 with two extending parts, the left part slender, the right part forming into an expanded sclerite; L3 well developed, curved and with a large hook; L4N simple, flat, L4M large, round; L8 with two sclerites overlapped, L7 slender, pubescent membrane surrounding L8 and L7. Right phallomere with R1M stout, R2 bulged, R3 transverse, concave.

Figures

Figure 3. Features of Corydiinae species. Polyphaga plancyi: (a) male pronotum; (b) male head; (c) male Sc swelling (absent); (j) setae on the margin of pronotum (male); (n) setae on the margin of pronotum (female);(p) tarsal claw (female); (r) tarsal claw (male).Polyphaga obscura: (m) pubescence on the margin of pronotum (female); (q) tarsal claw (female). Ergaula nepalensis: (d) male pronotum; (e) male head; (f) male Sc swelling; (k) pubescence on the margin of pronotum (male); (o) glands on the first two pleural membranes (male); (s) tarsal claw (male). Ctenoblatta impubis: (g) male pronotum; (h) male head; (i) male Sc swelling; (l) pubescence on the margin of pronotum (male);(t) tarsal claw (male).Scale bars:a, d, g = 3 mm; b–c, e–f, h–i = 2 mm; j–n, r–t = 0.3 mm; o = 1 mm; p–q = 0.5 mm.

Figure 8. Ctenoblatta impubis gen. et sp. nov., male holotype from Hubei: (a) supra-anal plate, ventral; (b) subgenital plate, ventral; (c) left phallomere, dorsal; (d–e) right phallomere: (d) lateral dorsal; (e) lateral ventral; (f) terminal sternites; (g) spheroid sense organs on the cercus; (h) hind tibia and tarsus; (i) antenna (from ninth antenomere on); (j) spines on the front tibia; (k) L3 (genital hook). Scale bars: a–d, h–i = 1 mm; e, j = 2 mm; f = 0.1 mm; g = 5 mm.

Figure 10. Venation of tegmina (top) and hind wings (bottom): (a) Polyphaga plancyi; (b) Ergaula nepalensis; (c) Ctenoblatta impubis; (d) Homoeogamia mexicana (after Rehn 1951).