Ptychoptera cordata, Zhang & Kang, 2021

Zhang, Xiao & Kang, Zehui, 2021, Two new species of the genus Ptychoptera Meigen, 1803 (Diptera, Ptychopteridae) from Yunnan, China with remarks on the distribution of Chinese species, ZooKeys 1070, pp. 73-86 : 73

Ptychoptera cordata sp. nov.

Figs 1 , 2

Material examined.

China • 1♂, holotype Yunnan Province, Menghai District, Mengbang Reservoir ; 21°54'50"N, 100°17'36"E; 1272 m; 6 Jun. 2019; Z. Kang leg.; QAU • 1♂, paratype same collection data as for preceding; QAU .

Diagnosis.

Postnotum dark brown, mediotergite with a cordiform yellow spot; wing marked with two brown bands; apical process of paramere semilunar, apex expanding outward; lateral extension of terminal division of hypandrium triangular with a pair of semicircular lobes medially, terminal division of hypandrium umbelliform.

Description.

Male. Body length 7.5-8.0 mm, wing length 7.0-7.5 mm.

Vertex and frons brown; face and clypeus yellow with light brown hairs; gena yellow with a black elliptical spot medially, hairs on gena brown; occiput yellow. Compound eyes black without pubescence. Scape, pedicel and basal 2/3 of 1st flagellomere yellow, remaining flagellomeres brown, setae dark brown. Proboscis light yellow with light brown hairs. Palpus yellow with last segment gradually darked apically, hairs brown.

Thorax (Fig. 1a, b ). Pronotum and propleuron light yellow. Prescutum, scutum and paratergite uniformly black. Scutellum mostly dark brown, middle area yellow with a patch of dense brown hairs. Mediotergite of postnotum dark brown, middle area with a cordiform yellow spot. Laterotergite half brown, outer half yellow with dense dark brown hairs, in dorsal view. Mesopleuron and metapleuron uniformly yellow. Coxae and trochanters yellow; femora yellow with brown ring apically; tibiae yellow with brown ring apically; 1st tarsomere of fore and hind legs yellow brown with brown ring apically. Hairs on legs brown. Wing (Fig. 1c ) 3.7 times as long as wide, subhyaline, marked with two brown bands as follows: median band extending from basa of Rs to middle section of CuA2; subapical band extending from tip of R1, covering pterostigma and extending to tip of M2. Veins brown; Sc ending in C at level of basal 1/3 of R2+3; Rs straight, slightly shorter than r-m; r-m arise from R4+5. Halter and prehaltere pale yellow with brown hairs.

Abdomen (Fig. 1a ). First tergum yellow with caudal 1/5 light brown, 2nd tergum yellow with middle area and caudal 1/6 brown, 3rd and 4th terga yellow with posterior margin brown, 5th tergum yellow with caudal 1/2 brown, 6th and 7th terga brown with posterior margin yellow. Sterna yellow. Hairs on abdomen brown.

Male genitalia (Fig. 2 ) yellow. Epandrium (Fig. 2b ) bilobed, epandrial lobe broad, epandrial clasper tapering and curved ventrally to the middle, slender apically, with brown hairs; epiproct with short hairs. Gonocoxite (Fig. 2c ) long and stout, 3.3 times as long as wide, basal apodeme small; apical process of paramere semilunar, apex expanding outward. Gonostylus (Fig. 2c ): anterior lobe of basal lobe of gonostylus on inner side with dense long hairs; medial lobe of basal lobe of gonostylus tongue-shaped with dense short hairs on posterior margin; secondary lobe of apical stylus of gonostylus finger-shaped with dense short hairs; apical stylus of gonostylus finger-shaped with short hairs. Hypandrium (Fig. 2d ): basal scale of hypandrium dumbbell-shaped basally with several hairs; spathate lobe of hypandrium broad at base with dense long hairs on inner side, hook-shaped apically with short hairs on posterior margin; basal division of hypandrium finger-shaped with dense long hairs on inner side; lateral extension of terminal division of hypandrium triangular with a pair of semicircular lobes medially; terminal division of hypandrium umbelliform. Aedeagus (Fig. 2e, f ): subapical sclerite tongue-shaped, apex of subapical sclerite round; aedeagal sclerites with apex laterally compressed, with dorsal corner extended anterodorsally, straight sided and convergent, base broad; lateral ejaculatory processes with base straight, narrow, extended straight anterolaterally; discoid apodemes with elongate ovoid dorsal extension; sperm sac subspherical; ejaculatory apodeme flag-like, closely associated with aedeagal sclerites, larger than sperm sac, paralleling anterior margin of sperm sac.

Female. Unknown.

Distribution.

China (Yunnan).

Etymology.

Specific name from Latin, Ptychoptera cordata (adjective, feminine, meaning “cordate”), referring to the postnotum with a cordiform spot.

Remarks.

This new species is similar to P. formosensis from China and Japan but can be separated from the latter by the postnotum dark brown with a cordiform yellow spot, the apical stylus of the gonostylus finger-shaped, and the apical process of paramere semilunar with apex expanding outward. In P. formosensis , the postnotum is uniformly black, the apical stylus of the gonostylus is flat tongue-like, and the apical process of the paramere is bilobed ( Nakamura and Saigusa 2009). This new species is also similar to P. annandalei Brunetti, 1918 from Burma, but can be separated from the latter by the apical process of paramere semilunar with apex expanding outward, the apical stylus of the gonostylus and the secondary lobe of the apical stylus of the gonostylus finger-shaped, not crossing. In P. annandalei , the apical lobes of the paramere are dorsoventrally flattened and semicircular with the spine curved anteriorly, apices of the apical stylus and secondary lobe of the gonostylus are crossing ( Fasbender 2014). This new species is also similar to P. perbona Alexander, 1946 from Burma, but can be separated from the latter by the mediotergite with a cordiform yellow spot, the apical stylus of the gonostylus finger-shaped, the apex of the terminal division of the hypandrium with an umbelliform lobe. In P. perbona , the mediotergite is uniformly black, the apical stylus of the gonostylus is stylate, the apex of the terminal division of the hypandrium has a pair of needle-like lateral lobes ( Alexander 1946; Fasbender 2014).

Figures

Figure 1. Ptychoptera cordata sp. nov. a habitus of male, lateral view b thorax, dorsal view, c wing. Scale bars: 2.0 mm (a); 0.5 mm (b); 1.0 mm (c).

Figure 2. Ptychoptera cordata sp. nov. a male genitalia, lateral view b epandrium, dorsal view c gonocoxite and gonostylus, dorsal view d hypandrium, ventral view e aedeagus, anterior view f aedeagus, lateral view. Scale bars = 0.2 mm. (AEA = Ejaculatory Apodeme, AES = Aedeagal Sclerite, ALP = Lateral Ejaculatory Process, AS = Sperm Sac, ASA = Subapical Sclerite of Aedeagus, ECP = Epandrial Clasper, EL = Epandrial Lobe, EPI = Epiproct, GAS = Apical stylus of gonostylus, GBA = Anterior lobe of basal lobe of gonostylus, GBM = Medial lobe of basal lobe of gonostylus, GCT = Gonocoxite, GSL = Secondary lobe of Apical Stylus of Gonostylus, GST = Gonostylus, HBD = Basal Division of Hypandrium, HBS = Basal scale of Hypandrium, HSL = Spathate Lobe of Hypandrium, HTD = Terminal Division of Hypandrium, HTE = Lateral Extension of Terminal Division, hypd = hypandrium, PMB = Paramere Base, PPA = Apical Process of Paramere).