Corynoptera perpusilla Winnertz, 1867

Babytskiy, A. I., Zuieva, O. A., Bezsmertna, O. O. & Dudiak, I. D., 2019, The First Records Of Corynoptera Species (Diptera, Sciaridae) From Ukraine, Vestnik Zoologii 53 (3), pp. 227-236 : 228-230

Corynoptera perpusilla Winnertz, 1867 ( figs 1–8 )

M a t e r i a l e x a m i n e d. Ukraine, Ivano-Frankivsk Region, between Nezvysko and Luka villages, left bank of Dniester River : 48.78383 N 025.25209 E, altitude ca. 170 m, meadow near forest, sweeping, 10.08.2016, 1 Ơ, leg. A. Babytskiy (No 91, UkrBIN-795807) ; Ukraine, Ternopil Region, Mykulyntsi settlement: 49.40126 N 25.60140 E, altitude ca. 295 m, vegetable garden in the yard near the house, Malaise trap, 19– 21.06.2016, 2 Ơ, leg. A. Babytskiy (No 117, UkrBIN-795829; No 120, UkrBIN-795830) ; Ukraine, Ternopil Region, outskirts of Pachorna village, left bank of Dniester River , NNP “Dnistrovskyi kanion”: 48.66650 N 025.67790 E, altitude ca. 140 m, coastal willow overgrowth, sweeping, 31.07.2017, 1 Ơ, leg. A. Babytskiy (No 253, UkrBIN-795946) .

D i s t r i b u t i o n: Austria, Azores Is., Balearic Is., Belgium, Britain Is., Bulgaria, Canary Is., Czech Republic, Danish mainland, French mainland, Germany, Greek mainland, Ireland, Italian mainland, Madeira Is., Poland, Romania, Russia (Moscow, Altay, Primorsk regions and Adygeya Republic), Slovenia, Spanish mainland, Sweden, Switzerland, The Netherlands ( Komarova, 2003; Hippa et al., 2010; Komarov, 2011; Menzel & Heller, 2013), Ukraine (first record).

Diagnosis. Male imagoes reach 1.5–2.0 mm in length. Eye bridge consists of 3 rows of ommatidia (facets) ( fig. 6 ). Maxillary palpus is long and slender, white-yellow colored, consists of 3 palpomeres. Basal palpomere is slender, as long as the third one, with unbordered dorsal patch of sensilla and one long setae; palpomere 2 is the shortest, makes ½ of basal one. Flagellomeres are dark and long setosed, the length/width of 4th flagelomere is 3.5 ( fig. 4 ). Thorax with sparse light brown setosity, honey to dark brown colored ( fig. 1 ). Postpronotum is bare. Mesonotum with lateral, central and scutellar light brown setae. Abdomen is concolorous with thorax. Legs are long and slender, concolorous with hypopygium. Front tibial organ t 1 is bordered by barely visible arch-shaped crest with fine vestiture, forming a comb-like row ( fig. 5 ). Spurs of t 2 and t 3 are long, with the same length. Tarsal claws without teeth. Wings are slightly fumose, posterior veins and membrane without macrotrichia, 1.2–1.4 mm in length ( fig. 7 ). stM and the base of M-fork are barely visible; stM is longer than M-fork; x = y, both bare; stCu is short, makes ½ x ( fig. 7 ); r 1 is short, makes ½ r, falls into C far before the basis of M-fork; r 5 falls into C in front of about the M-fork half; c/w = 0.6–0.7 ( fig. 7 ). Helter is fuscous, with 1 or 2 rows of setae. Hypopygium is light yellow-brown, gonocoxa without basal differentiation ( fig. 3 ). Gonostylus is slender, its length/width = 2.5, with dark apical tooth and 3 light hyaline megasetae which do not reach the end of the tooth ( fig. 2 ) ( Menzel & Mohrig, 2000).

Corynoptera perpusilla belongs to the large C. subtilis -Group contains 31 species which differ from the other Corynoptera by presence of distinct long and strong or short and rudimentary apical tooth on gonostylus ( Menzel & Mohrig, 2000). Corynoptera perpusilla is greatly similar to C. dubitata Tuomikoski, 1960 , C. alneti Hippa, Vilkamaa & Heller, 2010 , C. ninae Antonova, 1977 , C. praevia (Mohrig & Menzel, 1992) , C. dilligenta Rudzinski, 2008 , C. perornata Mohrig & Röschmann, 1993 (F. Menzel and W. Mohrig (2000) consider this species in Cratyna Winnertz, 1867 genus), C. montana (Winnertz, 1869) and C. sphenoptera Tuomikoski, 1960 ( Hippa et al., 2010). Corynoptera perpusilla is distinguishes from: C. dubitata by more gradual narrowing of gonostylus while gonostylus of C. dubitata are looking like obliquely cut apically; C. alneti by a narrower and more perpendicular apical tooth of the gonostylus; C. ninae by a less curved apical part of the gonostylus and shorter, stouter and less parallel gonostylar megasetae; C. praevia by less curved apical part of the gonostylus and three-segmented maxillary palpus instead of two-segmented in C. praevia ; C. diligenta and C. perornata by a shorter gonostylus with a relatively shorter apical tooth, also from C. diligenta it differs by normal, not unusually elongated necks on the antennal flagellomeres; C. montana by smaller size ( C. montana wing length is 1.8–2.3 mm) and less setose gonostylus and gonocoxa; C. sphenoptera by three megasetae instead 2 in C. sphenoptera and by absence of finger-like process dorsally on the tegmen ( Hippa et al., 2010).

Note. In some specimens of C. perpusilla from Ukraine (No 120 and 253) on r 1 1 proximal macrotrichia is present ( fig. 8 ), other specimens (No 91 and 117) shown r 1 with up to 5 macrotrichia along all vein ( fig. 7 ). Biometric indexes of studied specimens: wing length — 1.20–1.31 mm, wing width — 0.44–0.51 mm; width/length of wing = 0.35–0.40; stM/M-fork = 1.01–1.15; r 1 /r = 0.47–0.73; x/y = 0.74–1.17; stCu/x = 0.20–0.70; c/w = 0.54– 0.66. Length of spur/width of tibia: leg 1 = 1.13–1.52, leg 2 = 1.35–1.69; leg 3 = 1.10–1.48. Length of metatarsus/length of tibia: leg 1 = 0.48–0.51, leg 2 = 0.43–0.46, leg 3 = 0.43–0.48. Length of tibia 3/length of thorax 1.25–1.43.

Figures

Figs 1–8. Corynoptera perpusilla, males: 1 — thorax; 2 — ventral view of gonostyles; 3 — general view of hypopygium ventral; 4 — the fourth flagellomere; 5 — front tibial (t1) organ; 6 — eye bridge; 7 — wing; 8 — r1 vein of specimen No 253 (black arrow shows only 1 proximal macrotrichia on r1). Scale bars: 1, 3, 7 — 0.20 mm; 2, 4, 5, 6 — 0.05 mm.