Eucorydia Hebard, 1929

Qiu, Lu, Che, Yan-Li & Wang, Zong-Qing, 2017, Revision of Eucorydia Hebard, 1929 from China, with notes on the genus and species worldwide (Blattodea, Corydioidea, Corydiidae), ZooKeys 709, pp. 17-56 : 18-21

Genus Eucorydia Hebard, 1929

Eucorydia Hebard, 1929: 96; Princis 1963: 81; Asahina 1971: 256.

Type species.

Eucorydia westwoodi (Gerstaecker, 1861)

Diagnosis.

This genus is remarkable for its brilliant coloration; most species are a shiny metallic blue or green, with bright orange coloration on tegmina and abdomen.

Description.

Male: body length 8.0-18.5 mm, including tegmina 11.0-22.3 mm. Body small, bright, usually metallic greenish blue to blue, some species blackish colored, tegmina usually with orange band, spots or occupied by large orange areas, abdomen occupied by small to large orange areas. The coloration of the pubescence or setae on the body surface usually brown to black, or identical to the coloration where they are inserted (e.g., the yellow band usually with yellow pubescence), but some species may have additional white or gray pubescence in specific areas. Head: Roundly triangular (Fig. 1A), usually black with vertex slightly metallic, thickly pubescent, much denser at vertex; eyes wide apart, moderate size, interocular space narrower than the distance between antennal sockets, ocelli very small, reduced to small spots; two shallow dimples between the antennal sockets; antennae with basal segment elongate, the remaining segments short, but thickened medially and then thinner toward apex, two to six segments near the apex white (arrow in Fig. 1C); clypeus small, well divided into ante-clypeus and hind-clypeus, and hind-clypeus also distinctly divided by a longitudinal line medially; labrum specialized, transverse, median with a round impression, hind lateral corners protruded (arrow in Fig. 1D); maxillary palpi with 3rd segment enlarged, concave and pubescent (arrow in Fig. 1B), 4th segment with base thin, distal portion thick, 5th segment with apex truncated, hollow. Pronotum: transverse, usually metallic, some species black and with yellowish stripes, surface densely nodulose and setose, disc with many smooth and thin stripes forming a symmetrical marking (Fig. 1F). Tegmina and wings: Tegmina broad, ex ceeding the end of abdomen, metallic or black, usually with orange band, spotted or occupied by large orange areas; wings yellow to dark brown, some species with a transparent stripe across the middle of the wing, RA end usually with an elongate yellow spot. Venation as in Fig. 1 H–I ( Eucorydia dasytoides is an example), tegmen with a simple Sc which only has several small branches, R well-branched and occupying approximately 2/5 of the tegmen, M basally with a bifurcate branch and with approximately three branches distally, CuA branched basally, with approximately four branches. Hind wing with a single RA, RP occupying the distal margin, M single, CuA with approximately eight straight and paralleled branches. Legs: Dark brown to black, sometimes slightly metallic, with unequal length setae, apical femur with a spine, tarsal claws symmetrical, arolia present (Fig. 1E). Abdomen: Generally two types, one type totally orange except the last apical segments, the other type only with lateral portions orange, the rest of area dark brown to black, and slightly metallic; the 8th terga specialized, lateral corners protruded, spinous, elongate (Fig. 1J); eversible glands present (arrow in Fig. 1G). Supra-anal plate short, transverse, pubescent, median concave, the shape of hind margin varies, two median sclerites present, paraprocts asymmetrical, cerci long (Fig. 1K). Subgenital plate protruded, well setose, apex with a small and well setose isolated area (arrow in Fig. 1L), styli thick, long, setose. Genitalia: Left phallomere: L1 with anterior portion elongate, round, hind portion bifurcate, membrane medially, L2 enlarged, plate-like, left elongate, curved, L3 thin, strongly and roundly curved, L4N simple, L4M transparent, membrane, with two sclerotized portions, L7 well-developed, integrated with the right phallomere as an appendage sclerite, generally with two protruded parts, the basal one varied in shape, the distal one usually elongate, apex narrowed. Right phallomere: R1M large, elongate, subtransparent, hind apex protruded, round, R3 small, curved, R2 round, irregular, shape varies (Fig. 1M).

Female: winged, arolia present; generally similar to the male, but differing in the following features: 1) labrum not specialized, apex round, the 3rd segment of maxillary palpus normal, not enlarged and concave; 2) tegmina short in that they are usually reaching to, or only slightly beyond, the end of abdomen; 3) supra-anal plate large, round and protruded, apex slightly emarginated, median with a longitudinal line, cerci short; 4) subgenital plate with hind portion protruded, bulging.

Nymph: yellowish brown to dark brown, well pubescent, antennae near the apex white (Fig. 14H).

Ootheca: keel with distinct serrations. The longitudinal line on the surface sharp.

Natural history.

Male usually visiting flowers during the day (e.g., E. dasytoides was observed visiting the flowers of Castanopsis carlesii and Acer albopurpurascens in Taiwan, Wen-I Chou, pers. obs.), female can be found hiding under the bark of rotten wood (Yi-Zhou Liu, pers. obs. for E. linglong sp. n.). Sometimes the individuals can be found on the ground (Lu Qiu, pers. obs. for E. dasytoides ; Jin Chen, pers. obs. for E. linglong sp. n.), or observed flying on the mountain top (Wen-I Chou and De-Yao Zhou, pers. obs. for E. dasytoides ).

Distribution.

China, India, Myanmar, Vietnam, Japan, Southeast Asia.

Key to Eucorydia species worldwide

Checklist of Eucorydia worldwide (Chinese species in bold)

Eucorydia aenea (Brunner von Wattenwyl, 1865)-India, Thailand, Vietnam, Myanmar

Eucorydia coerulea (Shelford, 1906)-Malaysia

Eucorydia dasytoides (Walker, 1868)-China, Vietnam

Eucorydia forceps (Hanitsch, 1915)-Malaysia

Eucorydia gemma Hebard, 1929-Indonesia

Eucorydia guilinensis sp. n.-China

Eucorydia hilaris (Kirby, 1903)-China

Eucorydia linglong sp. n.-China, Vietnam

Eucorydia maxwelli (Hanitsch, 1915)-Malay Peninsula, Sumatra and Borneo

Eucorydia multimaculata Bruijning, 1948-Indonesia

Eucorydia ornata (Saussure, 1864)-India, Myanmar

Eucorydia pilosa sp. n.-China

Eucorydia splendida sp. n.-China

Eucorydia tangi sp. n.-China

Eucorydia tristis Hanitsch, 1929-Indonesia

Eucorydia westwoodi (Gerstaecker, 1861)-India, Nepal

Eucorydia xizangensis Woo & Feng, 1988-China

Eucorydia yasumatsui Asahina, 1971-Japan

Eucorydia yunnanensis Woo, Guo & Feng, 1986-China

Eucorydia sp. 1-Thailand

Eucorydia sp. 2-China