Coenosia globuliseta Pont, 1980

Muller, Burgert S. & Miller, Raymond M., 2013, Rediscovering the old from new: two curious species of Coenosia Meigen (Diptera: Muscidae) from South Africa, African Invertebrates 54 (2), pp. 595-595 : 599-601

Coenosia globuliseta Pont, 1980

Figs 1B , 2B, 3B , 6B, 7B, 8B, 9B

Coenosia globuliseta: Pont 1980: 755 [replacement name].

Coenosia longiseta Zielke 1971: 301 [junior homonym of C. longiseta Stein, 1906 ].

Diagnosis: A grey fly with a very striking, apically globular, 1 st pair of orbital setae. The frontal plate and parafrontlia of the head are golden silver-dusted. The trochanters and knees of all the legs are orange.

Redescription:

Male.

Measurements (mm): ♂ length: 4.10, wing: 3.97; ratios (length/width): head 0.9, thorax 1.5, abdomen 1.4.

Head ( Fig. 2B ): Dichoptic. Eyes bare and somewhat reduced, taking up just over ⅔ of head when viewed laterally.Antennal scape with one weakly developed setula, pedicel with one robust setula, one weak setula, and two even weaker lateral setulae. Postpedicel not reaching past bottom third of eye; ca 2× length of pedicel. Arista placed dorsally on postpedicel, bears fine hairs never longer than half the diameter of aristal base, and only present on basal ⅔. Palpus apically dilated, 3× width of palpal base ( Fig. 3B ). Gena wide, with face projecting forwards. Head grey-dusted all over, with the exception of the golden silver-dusted frontal plate and parafrontalia. Two pairs of ocellar setae. Four pairs of frontal setae, the 1 st and 3 rd pairs strongly developed, 2 nd and 4 th pairs weak and shorter. Two pairs of orbital setae, the first proclinate and elevated on separate, raised glossy tubercles; second pair reclinate, ¼ as long as first terminally globular pair. One pair of post-ocellar setae, one pair of paravertical setae. One pair of inner vertical setae, highly differentiated from paraverticals, being equal in size to 1 st pair of frontal setae. No outer verticals (or indistinguishable from postocular setae). One row of postocular setae. Two poorly defined rows of occipital setae. Two pairs of supravibrissal setae. One pair of vibrissae. Five pairs of subvibrissal setae.

Thorax: Grey-dusted throughout except for scutum, which is brown-grey-dusted, with three dark brown vittae running along the dorsocentral and acrostichal setae, clearly converging over scutellum. Six postpronotal setae. Two notopleural setae of equal length. Two postalar setae with one setula, posterior postalar seta twice the length of anterior postalar seta and 4× length of intrapostalar seta. One pair of supra-alar setae. No strongly differentiated intra-alar setae. Dorsocentral setae 1+3; equal in size. Acrostichal setae weakly differentiated, 3.5× shorter than dorsocentral setae. Scutellum: One pair of apical setae, one pair of equally strongly developed subbasal setae. One pair of weakly developed basal setulae. No subapical setae, and discal setal area restricted to five poorly differentiated setulae. Subscutellum bare. Two proepisternal setae. Two proepimeral setae, lower proepimeral setae slightly upcurved. Three strongly developed katepisternal setae of approximately the same length, forming an equilateral triangle (1:1:1) with three weak setulae inside the triangle.Anepimeron, meron and katepimeron bare, katatergite with fine hyaline hairs, anatergite bare. Wing hyaline and bare, with no conspicuous chaetation or suffusions. Haltere yellow.

Legs: Grey, with exception of orange trochanters and knees. Fore femur with three strongly developed posterodorsal setae, median seta being considerably stronger than supramedian and posteromedian setae; three preapical dorsal setae, two median dorsal setae, 10 posteroventral setae evenly spaced on femur, no differentiated posterior setae. Fore tibia with one preapical dorsal seta, one median and one preapical posterior seta. Mid femur with two supramedian anterior setae, one preapical posterodorsal seta, and one median posteroventral seta. Mid tibia with one median posteroventral seta and one apical ventral seta. Hind femur with one dorsal seta basally and two anteroventral setae: one situated postmedially and the other preapically. Seven evenly distributed anterodorsal setae. Hind tibia with one preapical posterodorsal seta, and without median anterodorsal seta.

Abdomen and terminalia: Grey-dusted throughout. Sternite 1 with setulae on lateral edges. Sternite 5 triangular, with setae mainly on lobes ( Fig. 6B ). Sternite 6 with left and right arms forming ring, right arm interrupted before articulation; two pairs of dorsal setae, innermost pair crossing. Cercal plate rectangular in general shape, with clear apical notch and two small dark processes apically ( Fig. 7B ). Surstylus fused with epandrium ( Fig. 8B ). Hypandrium tubular, with two flap-like structures on either side, hypandrial apodeme reduced, forming a shallow ridge.Aedeagus ( Fig. 9B ) with distiphallus angular in profile, sclerotized and unfuscate both dorsally and ventrally. Postgonite claw-shaped.

Holotype: ♂ SOUTH AFRICA: KwaZulu-Natal: Cathedral Peak area [28.9502°S 29.2053°E, max. uncertainty 2.5 km]// Natal Drakensberg // Alt. 7700 ft, 20 Mar. 1955 [20.iii.1955], B. Stuckenberg; [red label] Holotype; Coenosia // longiseta n. sp. // det. E. Zielke 1969; NMSA-Dip. 37487; NMSA type no. 1750. Genitalia dissected, with abdomen in vial under specimen.

Figures

Fig. 1. Lateral habitus: (A) Coenosia macrotriseta sp. n., ♂; (B) C. globuliseta Pont, ♂. Scale bar = 1 mm.

Figs 2, 3. (2) Head in lateral view: (A) C. macrotriseta sp. n., ♂; (B) C. globuliseta Pont, ♂. Scale bar = 0.5mm; (3) palpi: (A) C. macrotriseta sp. n., ♂; (B) C. globuliseta Pont, ♂. Scale bar = 0.2 mm.

Figs 6–9. Coenosia macrotriseta sp.n., ♂ (A) and C.globuliseta Pont, ♂ (B): (6) sternite 5, dorsal view; (7) cercal plate, dorsal view; (8)epandrium,surstylus and cercal plate, lateral view; (9) phallic complex, lateral view. Scale bar = 0.2 mm.