Cestrotus longinudus, Li, Shi, Yang, Ding & Gaimari, Stephen D., 2009

Li, Shi, Yang, Ding & Gaimari, Stephen D., 2009, Species of the genus Cestrotus Loew from China (Diptera: Lauxaniidae), Zootaxa 2009, pp. 41-68 : 60-62

Cestrotus longinudus sp.nov.

( Figs. 7 , 14 , 21 , 48–52; Map 2)

Diagnosis. Face with lower half with central U-shaped mark with lateral extensions dorsally; lacking a median stripe. Antennal 1st flagellomere yellow; arista short-plumose. Palpus yellow to yellowish brown. Scutellum with paired dark spots basally. All femora brown on basal 2/3; all tibiae with subbasal and apical ring. Wing with complex pattern of brown markings and hyaline areas, including dark +-shaped mark surrounding hyaline margins of crossvein r-m, with hyaline area continuous from anterior to posterior margins surrounding this dark +-shaped mark; distal margin hyaline; hyaline margin surrounding crossvein m-cu. Abdomen blackish brown, with grayish white pollinosity; female tergites 4–5 each with brownish yellow anterior margin.

Description. MALE. Body length 4.7 mm, wing length 4.6 mm. FEMALE. Body length 4.6 mm, wing length 4.5 mm.

Head ( Fig. 7 ) yellow with dark markings. Face yellow, with pair of small brownish triangular subantennal spots and lower half of face with central U-shaped mark with lateral extensions dorsally. Frons yellow, as long as wide and parallel-sided, with pair of black velvety triangular spots in upper part; ocellar triangle grayish black, with 2 rows of short setulae between ocellar triangle and vertex. oc strong and longer than anterior or; anterior or reclinate, almost as long as posterior one. Occiput yellow, with brownish median stripe extending to ocellar triangle. Gena yellow, with a brownish reniform spot; gena + subgena slightly higher than 1/2 height of eye. Antenna yellow except scape blackish brown; 1st flagellomere nearly 1.4 times longer than high; arista brown, short-plumose, with longest rays almost as long as 1/2 height of 1st flagellomere. Proboscis blackish brown, with yellow and dark hairs; palpus yellow to yellowish brown, with black setulae.

Thorax ( Fig. 14 ) grayish yellow pollinose over brownish ground color. Mesoscutum with wide brown U–shaped band along margin, pair of wide brown ensiform spots on transverse suture, pair of brown lateral elongate spots behind suture, and a large central black trapeziform spot on posterior 1/3 with anterior margin deeply bifurcated; 0+3 dc, acr in 3 somewhat irregular rows (6 rows total); prsc longer than anterior dc. 1 anepst, 1 kepst. Scutellum with ground color yellow distally and darker mediobasally, grayish yellow pollinose, with pair of small brown basal spots extended from trapeziform spot on mesoscutum. Legs yellow; femora brown on basal 2/3; tibiae each with a subbasal and apical ring; tarsomeres 3–5 brown. Fore femur with 2 pv and 3 pd, ctenidium with 18 short bristles; fore tibia with 1 preapical ad and 1 short apv. Mid femur with 6 a; mid tibia with 1 preapical ad and 2 strong apv. Hind femur with preapical ad, Hind tibia with 1 preapical ad and 1 short apv. Wing ( Fig. 21 ) 2.5 times longer than high; hyaline, with wide brown band through apical 1/2 of cell r1 confluent with subapical band through cells r2+3 and r4+5, forming an undulated stripe and extending to posterior margin; hyaline margin of crossvein r-m surrounded by dark +-shaped mark; hyaline margin of crossvein m-cu surrounded by 2 brown marks. Costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1+2) sections in proportion of 1.9: 0.8: 0.4; crossvein r-m beyond middle of discal cell; ultimate and penultimate sections of M1+ 2 in proportion of 1.5: 2.0; ultimate section of CuA1 about 1/10 of penultimate. Halter yellow.

Abdomen blackish brown, with grayish white pollinosity; female tergites 4–5 each with brownish yellow anterior margin. Male genitalia (Figs. 48–52): protandrium a complete ring, with several setae dorsally, with FIGURES 48–52. Cestrotus longinudus sp. nov., ɗ terminalia. 48. protandrium and epandrial complex, lateral view; 49. protandrium, anterior view; 50. epandrial complex, posterior view; 51. aedeagal complex, ventral view; 52. aedeagal complex, lateral view.

short process extending from ventral corners, thinnest ventrally; epandrium thick, subrectangular in lateral view and U–shaped in posterior view; surstylus with thick outer process, lacking setae except 1 seta basolaterally, and with thinner tapering and incurved inner process; cercus rounded, papillate, setose; hypandrium Y–shaped, bifurcated anteriorly; gonopod and paramere reduced; aedeagus in ventral view with pair of triangular basal processes, parallel sided in basal 1/2 and tapering in distal 1/2, with incision at tip, in lateral view strongly recurved apically; phallapodeme narrow, elongate, Y-shaped distally; ejaculatory apodeme small, simple.

Type material. Holotype ɗ ( CAUC), China, Hainan Province, Baisha, Yinggeling National Nature Reserve, Mohao village (860 m), 30. IV. 2008, Qifei Liu [19°14’N, 109°27’E]. Paratype: CHINA. Hainan Province: 1 Ψ ( CAUC), Ledong, Jianfengling National Nature Reserve, Zhiwuyuan (800 m), 9. V. 2008, Qifei Liu [18°44’N, 109°10’E].

Distribution. (Map 2) China (Hainan).

Remarks. This is the largest of the species of Cestrotus in China, being the only one larger than 4.5 mm. The new species is most similar to Cestrotus liui , sharing the U-shaped facial pattern of the lower half of the face, the palpal color, the general pattern on the mesoscutum and scutellum, the wing pattern, the thick outer surstylar lobe and the short process extending from the ventral corners of the protandrium, but can be easily differentiated by the lack of a median stripe on the face ( C. liui has a median stripe), the considerably larger and more elongate mesoscutal markings, the thicker and bare outer surstylar process (tapering and with setae and setulae in C. liui ), the thicker epandrium, and the aedeagus being parallel sided in the basal 1/2 (tapering evenly in C. liui ). The species Cestrotus flavoscutellatus is similar in the lack of a median stripe on the face, the general pattern of the mesoscutum and scutellum, the wing pattern, and in the thick outer surstylar lobe, but can be easily differentiated by the larger and more elongate mesoscutal trapeziform marking, the short process extending from the ventral corners of the protandrium (lacking in C. flavoscutellatus ), the longer outer surstylar lobe, the thinner aedeagus with the sides parallel in the basal 1/2 (thicker and evenly tapering in C. flavoscutellatus ).

Etymology. Latin, longus, meaning long + nudus, meaning bare; referring to the condition of the outer process of the surstylus; a masculine adjective.

Figures

FIGURES 2 – 8. Head, anterior view. 2. Cestrotus acuticurvus sp. nov.; 3. Cestrotus apicalis (Hendel); 4. Cestrotus flavoscutellatus de Meijiere; 5. Cestrotus heteropterus sp. nov.; 6. Cestrotus liui sp. nov.; 7. Cestrotus longinudus sp. nov.; 8. Cestrotus obtusus sp. nov..

FIGURES 9 – 15. Thorax, dorsal view. 9. Cestrotus acuticurvus sp. nov.; 10. Cestrotus apicalis (Hendel); 11. Cestrotus flavoscutellatus de Meijiere; 12. Cestrotus heteropterus sp. nov.; 13. Cestrotus liui sp. nov.; 14. Cestrotus longinudus sp. nov.; 15. Cestrotus obtusus sp. nov..

FIGURES 16 – 22. Wing. 16. Cestrotus acuticurvus sp. nov.; 17. Cestrotus apicalis (Hendel); 18. Cestrotus flavoscutellatus de Meijiere; 19. Cestrotus heteropterus sp. nov.; 20. Cestrotus liui sp. nov.; 21. Cestrotus longinudus sp. nov.; 22. Cestrotus obtusus sp. nov..