Parapsectra bumasta, Giłka, Wojciech & Jażdżewska, Natalia, 2010

Giłka, Wojciech & Jażdżewska, Natalia, 2010, A systematic review of the genus Parapsectra Reiss (Diptera: Chironomidae: Tanytarsini) with description of a new species from Poland, Zootaxa 2350, pp. 1-21 : 2-4

Parapsectra bumasta sp. n.

( Figures 1 , 8–11 , 32, 33 )

Type material. POLAND. Holotype: adult male, slide mounted in Canada balsam; Chmielonko at Lake Raduñskie Dolne (54º19’N 18º06’E), 3 May 2009, sweep net, NJ. Paratype: 1 male; collection data identical to those of the holotype. Types in DIZUG.

Derivation of the name. The specific name, derived from Latin - large swelling grapes, refers to the shape of the median volsella. The name is a noun in apposition.

Diagnosis. Adult male. Median volsella bearing c. 30 large, spoon-shaped lamellae arranged in regular rows. Inferior volsella bent at base, with distinct transversal protrusion.

Description. Adult male (measurements in Tables 1 and 8).

Colouration. Antennal pedicel, postnotum and sternum brown; scutal stripes orange to brown; head capsule, scutellum, haltere, ground colour of thorax and abdomen including hypopygium green; antennal flagellum and legs olive-brown; wing with greenish undertone, with C, M, and radial veins only slightly darker. Head. Antenna with 13 well-separated flagellomeres. Frontal tubercles absent. Third palpomere shorter than fourth. Wing. Sc, M, R2+3, proximal 1/5 of R4+5, very short proximal section of M1+2 and 1/3 proximal part of Cu bare, remaining veins with dense macrotrichia. FCu very slightly distal of RM. RM relatively long. Membrane covered with dense macrotrichia in almost entire area; macrotrichia below An particularly numerous. Anal lobe of wing relatively well developed ( Fig. 1 ). Legs. Spur of fore tibia straight, c. 10–12 μm long. Combs of mid and hind tibiae slightly separated, each tibia with 25–30 teeth c. 12 μm long (mid leg) and 32–35 teeth c. 16 μm long (hind leg).

fe ti ta1 ta2 ta3 ta4 ta5 p1 845–895 625–675 880 470 340 250 90 p2 800–880 700–765 360–390 215–230 155–170 110–120 90–95 p3 955–1030 880–955 565–615 360–390 280–300 170–175 105–110 Hypopygium. Gonostylus narrowed and bent at base, regularly tapering to slender tip ( Figs 8, 9 ). Anal tergite with relatively short, broadly separated bands of V-type; lateral teeth absent; anal point broad at base, short and apically rounded, bearing long and thin crests; microtrichia-free area surrounding base of anal point small ( Fig. 8 ). Superior volsella triangular, with pointed apex and anteromedian margin slightly convex bearing setal protuberances; digitus well developed, reaching beyond half length of superior volsella; Micropsectra -seta placed on tall tubercle ( Figs 8, 10 ). Median volsella grape-like, with straight and relatively long stem, bearing c. 30 large spoon-shaped lamellae placed in 3 regular rows posteromedially ( Fig. 11 ). Inferior volsella short, strongly bent at base, with distinct transversal protrusion and widely rounded apex ( Figs 8 , 32, 33 ).

Adult female, pupa and larva: unknown.

Discussion. Because of the peculiar structure of the median volsella and the short, strongly bent inferior volsella with distinct transversal protrusion ( Figs 8, 11 , 32, 33 ), Parapsectra bumasta cannot be mistaken for any other species of the genus or the tribe. The species morphologically most similar to P. bumasta , having the long gonostylus, the very short and apically rounded anal point as well as the short inferior volsella are P. nana and P. chionophila . The shape, venation and chaetotaxy of wing in males of P. bumasta and P. nana are also similar ( Figs 1 and 4 ).

Adult males of P. bumasta were collected from a small forest spring pool (limnocrene, c. 0.5 ha) in the closest vicinity of Lake Raduñskie Dolne. Seasonal variability in the species’ distribution is not known in detail. P. bumasta was sampled in early May, but was absent in April and late May as well as in July and August at the same site which was visited twice a month. Thus, it might be evidence of a single generation per year, although the results could have been affected by the non-typical dry weather conditions as a consequence of which, at the time of collection, the lake's water level has been lowered by c. 30 cm and most of the limnocrene area has been desiccated.

Figures

FIGURES 1 – 4. Wing of male. 1: Parapsectra bumasta sp. n., 2: P. chionophila, 3: P. m e n d l i, 4: P. nana.

FIGURES 8 – 11. Parapsectra bumasta sp. n., male. 8: hypopygium, 9: gonostylus (variation), 10: superior volsella and digitus (variation), 11: median volsella (magnified x 2 in comparison with hypopygium).

FIGURES 32 – 41. Hypopygial inferior volsella and inner margin of coxite. 32, 33: Parapsectra bumasta sp. n.; 34, 35: P. chionophila; 36, 37: P. m e n d l i; 38: P. nana; 39: P. styriaca; 40: P. uliginosa; 41: P. wagneri.