Cestrotus obtusus, 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 : 62-66

publication ID	https://doi.org/ 10.5281/zenodo.185763
DOI	https://doi.org/10.5281/zenodo.6214047
persistent identifier	https://treatment.plazi.org/id/245E87ED-1778-015B-58C1-FB64FE57FB2F
treatment provided by	Plazi
scientific name	Cestrotus obtusus
status	sp. nov.

Treatment

Cestrotus obtusus View in CoL sp.nov.

( Figs. 8 View FIGURES 2 – 8 , 15 View FIGURES 9 – 15 , 22 View FIGURES 16 – 22 , 53–57; Map 2)

Diagnosis. Face with a complex pattern consisting of irregular blackish brown spots, including a median longitudinal stripe; subantennal spots confluent with median stripe. Antennal 1st flagellomere yellow basally, blackish brown distally; arista pubescent. Brown triangular orbito-antennal spot present. Palpus black. Scutellum with paired elongate dark marks, separated basally from mark on mesoscutum. All femora black, grayish white pollinose except distally; all tibiae with a subbasal and apical black 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 with distinct pale brown marginal spots at tips of cells r2+3 and r4+5; with hyaline area surrounding crossvein m-cu. Abdomen blackish brown, with grayish white pollinosity.

Description. MALE. Body length 3.7–4.0 mm, wing length 3.4–3.7 mm. FEMALE. Body length 3.8–4.2 mm, wing length 3.4–3.8 mm.

Head ( Fig. 8 View FIGURES 2 – 8 ) yellow with dark markings. Face yellow, with a complex pattern consisting of irregular blackish brown markings, including a median brown longitudinal stripe confluent with dark transverse subantennal markings, and lower half of face with upside down Ω-shaped mark, with confluent transverse line ventrally. Frons yellow, slightly wider than long and parallel-sided, with pair of black velvety rectangular spots in upper part; ocellar triangle grayish black. oc strong and longer than anterior or; anterior or reclinate, shorter than posterior one. Occiput yellow, with brownish median stripe extending to ocellar triangle. Gena FIGURES 53–57. Cestrotus obtusus sp. nov., ɗ terminalia. 53. protandrium and epandrial complex, lateral view; 54. protandrium, anterior view; 55. epandrial complex, posterior view; 56. aedeagal complex, ventral view; 57. aedeagal complex, lateral view.

MAPS 1–2. Distributions of Cestrotus species. 1. C. acuticurvus sp. nov. [square], C. apicalis (Hendel) [circle]; C. heteropterus sp. nov. [triangle]. 2. C. liui sp. nov. [square], C. longinudus sp. nov. [triangle], C. obtusus sp. nov. [circle].

yellow, with a brown reniform spot; gena + subgena about 1/2 height of eye. Antenna yellow, except scape black and 1st flagellomere blackish brown on apical 1/3–1/2; 1st flagellomere 1.7 times longer than high; arista brown, pubescent, with longest rays shorter than 1/2 height of 1st flagellomere. Orbito-antennal spot present, brown, triangular. Proboscis blackish brown, with yellow and dark hairs; palpus black, with black setulae.

Thorax ( Fig. 15 View FIGURES 9 – 15 ) grayish white to yellow pollinose over blackish ground color. Mesoscutum with pair of brownish median spots and pair of undulated stripes on anterior margin, pair of brown elliptical spots on transverse suture, pair of brown lateral spots behind suture, and a large central black trapeziform spot on posterior 1/3 with anterior margin bifurcated; 0+3 dc, acr in 3 rows (6 rows total), each with brownish basal spot; prsc shorter than anterior most dc. 1 anepst, 1 kepst. Scutellum with ground color yellow distally and darker mediobasally, grayish white pollinose, with pair of brown round subbasal spots separated from trapeziform spot on mesoscutum. Legs yellow; femora grayish white pollinose except black at tip; tibiae each with a subbasal and apical black ring; tarsomeres 3–5 brown. Fore femur with 3 pv and 6 pd, ctenidium with 17 short bristles; fore tibia with 1 preapical ad and a short apv. Mid femur with 6 a; mid tibia with 1 preapical ad and 2 strong apv. Hind femur with a preapical ad; hind tibia with 1 preapical ad and 1 short apv. Wing ( Fig. 22 View FIGURES 16 – 22 ) 2.5 times longer than high; predominantly brown, with extensive irregular hyaline markings; distal brown marginal spots at tips of cells r2+3 and r4+5; with brown +-shaped marking surrounding hyaline margins of crossvein r-m. 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 1.6: 0.7: 0.4; crossvein r-m beyond middle of discal cell; ultimate and penultimate sections of M1+ 2 in proportion of 1.2: 1.9; ultimate section of CuA1 about 1/9 of penultimate. Halter yellow.

MAP 3. Distribution of Cestrotus flavoscutellatus de Meijere, including Chinese records [circles] and extralimital records by country [stars].

Abdomen blackish brown, with grayish white pollinosity. Male genitalia (Figs. 53–57): protandrium a complete ring, thinnest ventrally; epandrium narrow, elongate U–shaped in posterior view; surstylus with an acutely triangular outer process in lateral view, with several short bristles basally, narrow and blunt in posterior view, and a long and thick curved coniform inner process, longer than outer process; cercus rounded, papillate, setose; hypandrium Y–shaped; gonopod and paramere reduced; aedeagus in ventral view with paired triangular basolateral processes and with deep incision to distal tip, in lateral view abruptly curved apically; phallapodeme narrow, elongate, Y-shaped distally; ejaculatory apodeme small, simple.

Type material. Holotype ɗ ( CAUC), China, Zhejiang Province, Lin’an, Tianmushan National Natural Reserve, Dajinggu (700–800 m), 20. VII. 2007, Yajun Zhu [30°14’N, 119°43’E]. Paratypes: CHINA. Guangxi Province: 4 ɗ, 3 Ψ ( CAUC), 3 ɗ, 2 Ψ ( USNM), Longzhou, Longzhou National Nature Reserve, Nonggang station (400 m), 5. X. 2005, Yinxia Liao [22°21’N, 106°51’E]; 1 ɗ, 2 Ψ ( CAUC), Xing’an, Maoer Mountain, Jinshi (1200–1400 m), 5. VIII. 2005, Yajun Zhu [27°32’N, 111°58’E]. Hunan Province: 1 ɗ, 1 Ψ ( CAUC), Shimen, Hupingshan National Natural Reserve, Zhipeng River (450 m), 6. VI. 2008, Kuiyan Zhang [24°43’N, 108°49’E]; 4 ɗ, 3 Ψ ( CAUC), 3 ɗ, 2 Ψ ( USNM), Shimen, Hupingshan National Natural Reserve, Zhipeng River (450 m), 6. VI. 2008, Li Shi [24°43’N, 108°49’E]. Zhejiang Province: 2 ɗ, 2 Ψ ( CAUC), 1 Ψ ( USNM), Lin’an, Tianmushan National Natural Reserve, Dajinggu (700–800 m), 19–20. VII. 2007, Yajun Zhu [30°14’N, 119°43’E].

Distribution. (Map 2) China (Guangxi, Hunan, Zhejiang).

Remarks. The new species is very similar to Cestrotus acuticurvus in the general facial pattern, the palpal and antennal coloration, the general pattern on the mesoscutum and scutellum, and in the wing pattern, but can be differentiated by the confluence of the median facial stripe with the subantennal markings, the isolated scutellar markings (confluent with mesoscutal mark in C. acuticurvus ), the lack of a rhombic hyaline spot in the brown area of cell r2+3, the strong setae at the base of the outer surstylar process (thin hair-like setulae in C. acuticurvus ), the outer surstylar lobe being blunt in posterior view (sharpened and curved in C. acuticurvus ), the inner surstylar lobe being longer than the outer lobe, and the blunt aedeagus acutely curved distally (evenly curving to sharpened tip in C. acuticurvus ).

Etymology. Latin, obtusus , meaning blunt, dull; referring to the aedeagus being blunt apically in lateral view; a masculine adjective.