Polietina ponti, De Carvalho & Haseyama, 2018

De Carvalho, Claudio J. B. & Haseyama, Kirstern Lica F., 2018, A new species of Polietina (Diptera: Muscidae) from South America, with an updated phylogeny of the genus and a review of species’ identity in GenBank, Zootaxa 4407 (3), pp. 415-426 : 417-419

Polietina ponti sp. nov.

( Figs. 1–8 )

Description. Body length: 6.8 – 7.0 mm. General coloration ( Fig. 1 ). Male: thorax dark-brown with silver pruinosity, dorsum of scutum darker with two longitudinal stripes; humeral callus mostly yellowish; legs darkbrown, usually forelegs lighter; abdomen dark-brown with yellowish translucid areas on tergites 1+2 and 3. Head. Holoptic ( Fig. 2 ). Frontal row with six setae. Eye short and sparsely ciliated. Antenna long, with first flagellomere approximately 3 times longer than pedicel. Arista plumose; length of cilia twice longer than width of first flagellomere. Palpus slightly spatulate at apex. Thorax. Chaetotaxy: acr 2+1; dc 2+3, presutural seta strong; 2 humeral setae; posthumeral seta developed; 2 postsutural intra-alar setae; 2 supra-alar setae; 2 postalar setae, prealar strong; 3 notopleural setae, median seta shorter than posterior notopleural. Anepimeron ciliated on inferior and superior margins. Postalar wall with set of setulae on median region; supra-squamal ridge setulose on anterior portion; prosternum setulose; katepisternal setae 1:2. Posterior spiracle setulose on hind margin. Metakatepisternum ciliated below spiracle and above hind coxa. Lower calypter glossiform with yellow-whitish border. Wing with conspicuous maculae on apex of R1, on apex of R2+3 and on r-m and dm-cu, slight macula on apex of R4+5; apex of M straight and parallel to R4+5 (Fig. 3). Subcostal sclerite with ventral setulae; R1 entirely setulose on dorsal surface; apical portion of stem-vein dorsally and ventrally with setulae; R4+5 setulose dorsally from node almost until apex and ventrally on node; M setulose ventrally from r-m until dm-cu. Legs. Mid tibia with 4 P setae, and one strong V submedian seta. Hind coxa bare on P surface. Hind tibia with series of 7 (paratype) or 8 (holotype) AD setae and with 4 AV setae; strong seta (calcar) on apical third and shorter seta at basal third on PD surface. Abdomen. First abdominal sternite setulose. Male: fifth sternite longer than wide ( Fig. 8 ); cercal plate wider than long in dorsal view ( Fig. 4 ); two median spiny processes on ventral surface with 4–5 short spines and two marginal spiny processes downwardly oriented, bearing 3 spines, visible on dorsal view ( Figs. 4–5 ); surstylus reniform with strong median groove ( Fig. 6 ). Distiphallus membranous, pregonite tapered, small with a long setulae; postgonite larger anteriorly with three setula, a little smaller than epiphallus ( Fig. 7 ).

Differential diagnosis. Polietina ponti sp. nov. is similar to Polietina flavithorax , differing by the number of AD and AV setae and the absence of a series of PV setae on the hind tibia; the shape of the cercal plate dorsally and ventrally – ventral surface with a pair of marginal downwardly oriented spiny processes bearing spines ( Figs. 4–5 ) and surstylus reniform with strong median groove ( Fig. 6 ) differs between the two species (cf. Couri & Pamplona 1997: figs. 8 and 10, as P. stellata ).

Etymology. Name in apposition. The specific epithet is in homage to Adrian Charles Pont, senior researcher on the systematics of world Muscidae and other Calyptratae families. He constructed the taxonomic base of the previous classification of all regional Muscidae catalogues based on morphological evidence.

Distribution. Peru.

Material examined. Holotype male, PERU: Madre de Dios, Rio Tambopata, Sachavacayoc / centre: 12°50′59.6″S 69°22′07.7″W, 164 m asl . , 23.vii.–6.viii.2009, J.T. Smit, Malaise trap ( DZUP, voucher ID: 342115).— Paratype male, PERU: Madre de Dios, Rio Tambopata, Sachavacayoc / centre: 12°50′58.2″S 69°22′10.3″W, 162 m asl ., 10–15.x.2009, J.T. Smit, Malaise trap (DZUP, voucher ID: 342116).

FIGURE 3. Wing of Polietina ponti sp. nov. (male paratype).—Abbreviations of wing veins: A1+CuA2, first branch of anal vein plus second branch of cubital vein; bm-cu, basal medial-cubital crossvein; C, costal; CuA1, first branch of cubital vein; CuA2, second branch of cubital vein; dm-cu, discal medial-cubital crossvein; M1, media; R1, anterior branch of radius; R2+3, second and third branches of radius; R4+5, fourth and fifth branches of radius; r-m, radial-medial crossvein; Sc, subcosta.

Remarks. The holotype male is in good condition and was not dissected. It was removed from alcohol, pinned and deposited in the dry Diptera collection (DZUP). The paratype male was dissected, the terminalia figured (figs. 4–8), and is in the alcohol collection (DZUP). The paratype specimen was identified as “ Polietina sp.” in Kutty et al. (2014).

Figures

FIGURES 1–2. Male habitus of Polietina ponti sp. nov. (holotype). 1: habitus,lateral view; 2: head, anteriorview.

FIGURES 4–8. Male terminalia of Polietina ponti sp. nov. (paratype). 4: cercal plate, dorsal view, marginal spined processes visible; 5: cercal plate, ventral view, marginal spined processes omitted; 6: right surstylus, lateral view; 7: phallus and associated appendages, lateral view; and 8: fifth sternite, dorsal view.(Scale bar: 0.2mm)