Thliptoceras bisulciforme Zhang

Zhang, Dandan, Xu, Jiawen & Li, Jinwei, 2014, Review of the genus Thliptoceras Warren, 1890 (Lepidoptera: Crambidae: Pyraustinae) from the Oriental region of China, Zootaxa 3796 (2), pp. 265-286 : 272

Thliptoceras bisulciforme Zhang , sp. nov.

Figs. 21, 22 , 34 , 42

DIagnosIs. Thliptoceras bisulciforme is similar to T. fulvimargo with smoky fuscous wings with their pattern obscured in male, but it can be distinguished by the larger wing expanse (28–30 mm), a differently modified antennal base in the male, a much wider valva with a rounded trapezoidal process on its costa near the apex, followed by a semicircular excavation, an editum curved rather than bent dorsad, a sacculus process reaching to base of costa, an anellus with two parallel, connected, trough-shaped sclerotizations, and an aedeagus with spineshaped cornuti arranged in a single group.

DescrIptIon. Male. Head. Frons fuscous and vertex pale yellowish fuscous. Labial palpus exceeding head by less than length of head, yellowish fuscous, contrastingly creamy white at base ventrally. Maxillary palpus yellowish brown. Basal scaling of proboscis white or pale yellow. Antenna fuscous; scape dorsally compressed, basal segment of flagellum enlarged with a shallow transverse groove lined with small scales followed and partly covered by a long, oblique, appressed scale-tuft extending inwardly, with the following few segments compressed, and moderately expanded, forming a curved sinus. Thorax. Tegula fuscous. Thorax fuscous dorsally and paler ventrally. Legs grey fuscous dorsally, paler ventrally; male hind tibia with inner mid-spur longer than other inner spurs and outer mid-spur minute, other outer spurs about 1/2 length of inner. Wing expanse 28–30 mm. Wings fuscous, markings deep fuscous, antemedial and postmedial lines obscure; reniform stigma ring-shaped, obscure. Fringe fuscous, with pale yellow base line. Abdomen. Fuscous dorsally and paler ventrally. Male genitalia. Uncus very narrowly triangular, setose dorsolaterally except apex. Valva broad, slightly curved, costa roughly parallel to ventral margin, with a large trapezoidal process near apex, followed by a semicircular excavation and a curved, tapering apex with a spine; editum curved dorsad, apex little inflated and sparsely setose; sacculus with medial process a roundish lobe, reaching to base of costa. Juxta long plate-shaped, constricted at ventral 1/3; anellus fused with juxta, comprised of two parallel, connected, trough-shaped sclerotizations. Aedeagus slender, with a group of spine-shaped cornuti.

Female in general paler than male. Wings pale fuscous, straw yellow beyond postmedial line; fringe pale fuscous, with pale yellow base line, pale yellow at hindwing tornal area. Female genitalia. Ovipositor lobes flat, crescentic, densely setose. Apophyses anteriores curved in middle, almost twice length of apophyses posteriores. Antrum strongly sclerotised, funnel-shaped, gradually broadening towards ostium, narrowest at 1/4 from anterior end, posterior end with collar-shaped extension ventrally. Ductus seminalis originating from close to anterior end of antrum. Ductus bursae irregularly spiraled, length about 5 times diameter of corpus bursae, posterior part inflated and sclerotized. Corpus bursae globular, signum very small (less than 1/4 diameter of corpus bursae), angles bearing carina nearly right-angled and the other two blunt; accessory bursae arising laterally from corpus bursae.

MaterIal examIned. Holotype: ♂, CHINA, Guangxi: Mt. Maoershan (25°53'N, 110°25'E), Xing’an County, 26.V.2010, coll. Wu Hongsheng, Zhao Shuang and Tong Bo, genitalia slide No. ZDD10077; Paratypes: Guangxi: 1 ♂, 2♀, Mt. Maoershan (25°53'N, 110°25'E), Xing’an County, 26.V.2010, coll. Wu Hongsheng, Zhao Shuang and Tong Bo, genitalia slide No. ZDD12011.

DIstrIbutIon. China (Guangxi).

Etymology. The specific name is derived from the Latin bi - = two and sulciformis = trough-shaped, referring to the anellus looking like two parallel, trough-shaped sclerites.

Figures

FIGURES 15 – 22. Adults of Thliptoceras spp. 15 – 16. T. artatalis. 15, ♂, Mt. Tianmushan; 16, ♀, Mt. Danxiashan. 17 – 18. T. gladialis. 17, ♂, Yingde; 18, ♀, Yingde. 19. T. bicuspidatum sp. nov. ♂, holotype. 20. T. semicirculare sp. nov. ♂, holotype. 21 – 22. T. bisulciforme sp. nov. 21, ♂, paratype, Xing’an; 22, ♀, paratype, Xing’an.

FIGURES 33 – 35. Male genitalia of Thliptoceras spp., with enlarged detail of base part of valva (top right). 33. T. semicirculare sp. nov. paratype, genitalia slide no. ZDD 12005 (image reversed). 34. T. bisulciforme sp. nov. holotype, genitalia slide no. ZDD 10077. 35. T. fulvimargo. genitalia no. ZDD 12010 (image reversed).

FIGURES 42 – 43. Female genitalia of Thliptoceras spp. 42. T. bisulciforme sp. nov. paratype, genitalia slide no. ZDD 12011. 43. T. sinense. genitalia slide no. ZDD 10070. (Scale bars = 1.0 mm)