Criotettix longispinus Deng, 2019

Deng, Wei-An, Chen, Dan-Ni, Sheng, Qin, Zhao, Cong-Lin & Wu, Fei-Peng, 2019, An annotated catalogue of the pygmy grasshoppers of the genus Criotettix Bolívar 1887 (Orthoptera: Tetrigidae) with two new Criotettix species from China, Zootaxa 4629 (4), pp. 498-518 : 503-507

15. Criotettix longispinus Deng , sp. nov.

( Figs. 1–3 )

Description. Female (holotype). Body moderate-sized, elongated and slender. Head not exserted above pronotal surface. anterior margin of vertex straight in dorsal view and not protruding beyond eyes, 1.2 times wider than width of one eye; lateral margins turned backward; median carina reaching the middle of vertex. Vertex and frontal ridge forming an obtuse round shape in profile, frontal ridge protruding archly between antennae, width of longitudinal furrow distinctly narrower than width of first antennal segment. Antenna filiform, 15-segmented; length of a segment in middle of antenna about 5–6 times longer than its width, inserted between lower margins of eyes. Eyes globose. Lateral ocelli placed in middle of anterior margins of eyes.

Disc of pronotum with sparse and coarse tubercles; in dorsal view, anterior margin of pronotum truncate, median carina of pronotum completed except median carina between prozona invisible, in profile anterior half of upper margin of pronotum undulated and posterior half straight. Lateral carinae of prozona constricted backwards, humeral angle nearly arched, abbreviated carinae between shoulders inconspicuous or absent, caudal end of pronotum narrow, long cone-shaped, apex slightly surpassing apex of hind tibia, length of hind process which surpassing behind apex of hind tibia about 2 mm. Lateral lobes of pronotum turning outwardly, posterior angles directed distinctly transversely, apex of posterior angles with long spines, length of spine longer than width of vertex, posterior margin of each lateral lobe of pronotum with two concavities. Tegmina long, ovate, apex rounded. Hind wings reaching apex of posterior process of pronotum. Lower margins of fore femora and midfemora almost straight and gentle serrated; width of middle femora distinct narrower than width of visible part of tegmina. Hind femur 3.7 times as long as wide, upper margin finely serrated and with a slightly large tooth before antegenicular (some individuals not obvious), lower margin smooth, antegenicular acute and genicular denticles right angled. Outer side of hind tibia with eight to nine spines, inner side with six to seven spines. Length of first segment of posterior tarsus longer than third, three pulvilli equal in length, apices of three pulvilli obtuse. Ovipositor narrow and long, length of upper valvulae 3.2 times its width, upper and lower valvulae with slender sawlike teeth. Length of subgenital plate nearly equal to its width, middle of posterior margin of subgenital plate with a triangular projecting.

Body dark brown to yellow. Antenna dark brown. Hind wings black. Fore and middle femora dark brown, fore and middle tibia dark brown and with three light rings; hind femur brown to dark brown, hind tibia brown.

Male. Similar to female, but smaller and narrower. Width of vertex equal to or slightly narrower than the width of an eye, hind wings of some individuals slightly surpassing apex of posterior process of pronotum. Subgenital plate cone-shaped.

Measurements (mm). Length of body: ♂ 11.5–12.0 mm, ♀ 14.5–15.0 mm; length of pronotum: ♂ 19.0– 19.5 mm, ♀ 22.0–23.0 mm; length of hind femur: ♂ 7.0– 7.5 mm, ♀ 8.5–9.0 mm.

Type material. Holotype: 1♀, 26 July 2017, collected by Wei-An DENG, EMHU . Paratypes. 10♂ 8♀, same data, type locality, EMHU .

Type locality. China, Hainan prov., Wuzhishan ( Wuzhishan National Forest Park) ( Figure 8 ), 18°51.9674ʹ N, 109°40.9319ʹ E, 660m alt .

Diagnosis. New species is similar to Criotettix japonicus ( Haan, 1842) from which it differs in width of vertex 1.2 times wider than width of one eye in female (width of vertex 2.0 times wider than width of one eye in female in C. japonicus ); length of a segment in middle of antenna about 5–6 times longer than its width (length of a segment in middle of antenna about 2 times longer than its width in C. japonicus ); abbreviated carinae between shoulders inconspicuous or absent (with a pair of abbreviated carinae between shoulders); caudal end of pronotum surpassing apex of hind tibia (caudal end of pronotum reaching two-thirds of hind tibia). It appears similar also to Criotettix yunnanensis Zheng & Ou, 2003 , but differs from the latter by lateral carinae of prozona constricted backwards (lateral keels of prozona parallel in C. yunnanensis ); posterior angles of lateral lobes of pronotum with long spines (posterior angles of lateral lobes of pronotum acute and subspiniform in C. yunnanensis ); upper margin of hind femur finely serrated and with a slightly large tooth before antegenicular (upper margin of hind femur smooth in C. yunnanensis ). It appears similar also to Criotettix armigera ( Walker, 1871) , but differs from the latter by head not exserted above pronotal surface (head exserted above pronotal surface in C. armigera ); width of vertex 1.2 times wider than width of one eye in female (width of vertex equal to or narrower than width of one eye in female in C. armigera ); abbreviated carinae between shoulders inconspicuous or absent (with a pair of abbreviated carinae between shoulders in C. armigera ); length of posterior angles spines of lateral lobes of pronotum longer than width of vertex (length of posterior angles spines of lateral lobes of pronotum shorter than width of vertex in C. armigera ).

Etymology. The specific epithet is derived from “ long ” and “ spinus ”, meaning posterior angles of lateral lobes of pronotum with long spines.

Distribution. P. R. CHINA: Hainan.

Figures

FIGURE 1. Criotettix longispinus Deng, sp. nov., female, holotype:A—body in dorsal view; B—body in lateral view; C—head in dorsal view; D—head and pronotum in dorsal view. (scale bar = 1 mm).

FIGURE 2. Criotettix longispinus Deng, sp. nov., female, holotype:A—head in lateral view; B—head in frontal view; C—left fore femur in lateral view; D—left mid femur in lateral view; E—left hind femur in lateral view; F—left hind tibia in dorsal view; G—left posterior tarsi in lateral view; H—Ovipositor in lateral view; I—subgenital plate of female in ventral view. (scale bar = 1 mm).

FIGURE 3. Criotettix longispinus Deng, sp. nov., male, paratype: A—body in dorsal view; B—body in lateral view; C—subgenital plate of in lateral view. (scale bar = 1 mm).

FIGURE 8. Collection localities of Criotettix longispinus sp. nov. and Criotettix undatifemurus sp. nov.