Euryobeidia supercostata Liu, Stüning & Han, 2025

Liu, Bo, Stüning, Dieter & Han, Hongxiang, 2025, Further taxonomic studies of the mimetic genus Euryobeidia Fletcher, 1979 (Lepidoptera, Geometridae, Ennominae, Baptini), with descriptions of four new taxa and two status changes, ZooKeys 1260, pp. 313-343 : 313-343

Euryobeidia supercostata Liu, Stüning & Han sp. nov.

Figs 14 , 15 , 44

Euryobeidia incrassata Xiang & Han, 2017 , Zootaxa 4317 (2): 372 (part).

Type material.

Holotype. China – Hainan Province • ♂; Lingshui, Diaoluoshan; 8 May 1984; coll. Gu Maobin; IOZ-CAS slide no. Geom- 4140; IZCAS.

Diagnosis.

This new species is nearly identical in habitus, pattern, and coloration to the sympatric Euryobeidia languidata incrassata Xiang & Han , but it is considerably smaller in size. Moreover, there are some extremely subtle differences. For example, the section near the inner margin of the forewing has almost no black streaks; the hindwing discal spot is very small, appearing as a tiny dot. However, with only one specimen, we cannot be certain if these are stable characters. In addition, the male genitalia of this species, featuring an elongated uncus and an extremely broad costal protrusion, are distinctly different from those of other congeneric species.

Description.

The length of the forewing in the single male is ~ 20 mm. The wing pattern is almost identical to that of ssp. incrassata (see the redescription of E. languidata incrassata ), except for the uncertain subtle differences already mentioned in the diagnosis.

Male genitalia. Uncus long, subapical part (or stem) conspicuously elongated, slightly dilated dorsally, densely covered with setae, beak-like part long and stout. Socii absent or barely visible (the single type specimen). Gnathos weak, with a pair of short, fine sclerotized lateral arms, widely open or membranous in the middle. Tegumen moderately short (compared to most of other members of the genus), distally strongly curved ventrad. Transtilla long, broad, ribbon-like, slightly sclerotized. Valva broad, apex less curved dorsad (compared to most of congeneric species), ventral margin smooth, without notch. Costa with a markedly broad projection close to apex, dorsal edge faintly serrated in the middle. Cucullus well developed, from middle to apex of valva. Basal saccular process broad, lamellar, dorsal edge with minute denticles. Juxta strongly sclerotized, groove-like. Saccus short, rounded. Aedeagus slender, apically slightly tapering. Cornuti consisting of multiple irregularly joined sclerotized folds and patches.

Female. Unknown.

Distribution.

China ( Hainan).

Etymology.

The specific name is derived from the extremely broad costa of the male genitalia.

Remarks.

The holotype of Euryobeidia supercostata sp. nov. was originally designated as a paratype of E. incrassata Xiang & Han, 2017 . However, our examination of the holotype revealed that E. incrassata should be treated as a distinct subspecies of E. languidata (see E. languidata incrassata stat. nov.).

Figures

Figures 2–19. Adults of Euryobeidia species. 2–8. E. languidata (Walker): 2. The holotype of Abraxas languidata, female, Nepal, NHMUK; 3. Female, Nepal, upperside, ZSM; 4. Ditto, underside; 5. Male, Khasi Hills, India, ZFMK; 6. Male, N. Vietnam, CKY; 7. Male, Tokyo, Japan, CRS / NIAES; 8. Female, Niigata, Japan, CRS / NIAES; 9. E. ellipsoidea, untypical pattern, female, Sichuan, China, ZFMK; 10–13. E. languidata incrassata Xiang & Han, stat. nov., Hainan Is., China: 10. The holotype of E. incrassata Xiang & Han, male, IZCAS; 11. Non-type, male, upperside, CRICATAS; 12. Ditto, underside; 13. Non-type, female, CRICATAS; 14, 15. E. supercostata sp. nov., holotype, male, Hainan, China, IZCAS: 14. Upperside; 15. Underside; 16, 17. E. yakushimensis Inoue, stat. nov., Yakushima Is., Japan: 16. The holotype of E. languidata yakushimensis Inoue, male, NHMUK; 17. Non-type, female, CRS / NIAES; 18. E. ellipsoidea, paratype, female, Sichuan, China, ZFMK; 19. E. xuei sp. nov., paratype, male, Fansipan, Vietnam, ZFMK. Scale bar: 10 mm.

Figures 44–49. Male genitalia of Euryobeidia species. 44. E. supercostata sp. nov., holotype, Hainan, China, IOZ-CAS slide no. Geom- 4140; 45. E. xuei sp. nov., holotype, male, Fansipan, Vietnam, gen. prep. no. 2458 - DS; 46, 47. E. tigratoides sp. nov., paratypes, Hainan Is., China, gen. prep. nos. CRICATAS 00247, CRICATAS 00243; 48, 49. E. tigratoides leopardiformis subsp. nov.: 48. Holotype, Sichuan, China, IOZ-CAS slide no. Geom- 04555: 49. Paratype, W. Hubei, China, gen. prep. no. 2449 - DS. Scale bars: 1 mm.