Neozavrelia samarga, Orel, 2021

Orel, Oksana V., 2021, Revision of the genus Neozavrelia Goetghebuer, Thienemann, 1941 (Diptera Chironomidae) from Eastern Siberia and the Russian Far East, with the description of new species, Zootaxa 4938 (3), pp. 251-297 : 284-285

Neozavrelia samarga sp. nov.

( Figs 100–109 )

http://zoobank.org/NomenclaturalActs/1227201e-95b8-47c0-886b-e9d1fa0887d5

Type material. Holotype, male: RUSSIA, PRIMORSKY TERRITORY, Terney District, Samarga River 2.5 km above the mouth of the Kuksi stream, 03.viii.2016, leg. O. Orel.

Derivatio nominis. From the type locality Samarga River.

Diagnosis. Wing 1.04 mm long. Frontal tubercles reduced. AR 0.5 (13 flagellomeres). The length of the 3rd and 4th maxillary palpomeres is shorter than the 2 nd. The anal point triangular rounded apically, with 5 strong and short spinulae and covered with microtrichia. Superior volsella broad, elongated oval-shaped, with 3 median setae, two of which are located on a tubercle (ventral seta absent). Digitus extends beyond the medial edge of the superior volsella.

Description. Adult male (n=1). Wing length 1.04 mm.

Colouration. Ground colour of thorax, scutellum, maxillary palpomeres and abdomen pale brown; halters yellowish; antenna, scutal stripes, median band on distal half of mesonotum and postnotum dark brown; abdomen and legs yellowish brown.

Head ( Figs 104–105 ). Frontal tubercles reduced the remaining traces of the frontal tubercles 3.4 μm in diameter, situated on swellings of frontal lobes. Temporal setae 9. Clypeus with 6 setae. Antenna with 13 flagellomeres, 975 μm long; ultimate flagellomere 325 μm. AR 0.5. Maxillary palpomeres 2–4 combined 260 μm long, their individual lengths (in μm): 40: 85: 65: 70. Antenna length/palp length 3.75.

Thorax. Acrostichals 9, dorsocentrals 5, prealars 1. Scutellum with 2 setae.

Wing ( Figs 106–107 ). R with 9–10, R 1 without setae, R 4+5 with 2 apical, M 1+2 with 19–22, M 3+4 with 3 setae. Wing crumpled and veins Cu 1 and An not visible. Cell r 2+3, r 4+5 with setae, m 1+2 with several setae. Brachiolum with 1 seta.

Legs (see Table 14). Apical curved tibial spur of fore leg 18 μm long. Combs of mid and hind tibiae separated; each comb bears straight or slightly curved spur, 14 μm (mid tibia) to 26 μm long (hind tibia). Basitarsus of mid leg without sensilla chaetica.

Hypopygium ( Figs 100–104, 108–109 ). Anal tergite with H-shaped bands which reach base of the anal point, with 3 lateral setae on each side, free-microtrichia areas present on the sides of anal tergite bands. The anal point in apical half truncated-conical (20 μm long and 16 μm wide in the base and 10 μm wide on the apex), medially with 5 dark strong spinulae (4–6 μm long) and covered with microtrichia, bearing 2 lateral setae on each side of the anal point. Gonocoxite 90 μm long, along the inner margin with 3 setae. The width of the transverse sternapodema 42 µm. Phallopodema 90 μm long. Superior volsella broad, elongated oval-shaped (40 μm long, 26–30 μm wide), bearing 3 median setae, two of which are located on a tubercle (ventral seta absent), and 6 fine dorsal setae, microtrichia absent ( Figs 13–14 ). Digitus 18–20 μm long, extends beyond the medial edge of the superior volsella. Stem of the median volsella straight 26 μm long, bearing slender lamelliform setae; total length of the median volsella 40 μm. Inferior volsella curved and rounded apically, 60 μm long, with 10 setae. Gonostylus straight, 80 μm long and expanded at about proximal 1/3 (20 μm wide). HR 1.13.

Female, pupa and larva unknown.

Remarks. The male of Neozavrelia samarga sp. nov. is more similar to the West Europea species— N. bernensis Reiss, 1968 and N. cuneipennis (Edwards, 1929) , but differs from the latter by the truncated-conical shape of the anal point with 5 dark strong spinulae and the ratio of the lengths of the segments of the maxillary palp (the 2nd segment is longer than the 3rd and 4th segments) (See Table 15).

Distribution. Russian Far East—Samarga River (Primorsky Territory).

Figures

FIGURES 100–103. Details of the structure of hypopygium the male of Neozavrelia samarga sp. nov. 100—total view of hypopygium, dorsal view; 101—tergite IX and anal point, dorsal view; 102, 103—superior volsella, dorsal view. Scale bar 50 μm.

FIGURES 104–109. The male of Neozavrelia samarga sp. nov. 104—head and maxillary palps; 105—antenna; 106–107— wing; 108, 109—hypopygium. Scale bar 50 μm.

FIGURES 9–22. Details of the structure of the male of Neozavrelia kedrovaya sp. nov. 9—maxilar palp; 10—total view of hypopygium; 11, 12—anal point; 13—superior volsella; 16–18—gonostylus and inferior volsella; 19–21—tergite IX, lateral view; 22—thoracic horn. Scale bar 50 μm.