Phthinia kurilensis, Zaitzev, Alexander, 2017

Zaitzev, Alexander, 2017, Two new species of fungus gnats (Diptera: Mycetophilidae) from Kunashir Island, Kuril Islands, Zootaxa 4250 (3), pp. 296-300 : 298

Phthinia kurilensis sp.n.

Figures 5–6

Type material. Holotype male. RUSSIA, E Kunashir I., Filatovka River , 30–31.VII.2014, Y. Sundukov leg. ( ZMUM).

Description. Male. Body length 6.6 mm. General colouration dark brownish-gray.

Head. Dark brown. Palpi brown. Antennae brown, scape yellowish. First flagellomere approximately 1.2 times as long as second flagellomere. Sixth flagellomere 6 times as long as wide.

Thorax. Mesonotum brown. Scutellum with two long bristles. Mediotergite haired. Laterotergite bare.

Wings. Hyaline, light grayish. Wing length 3.8 mm. Membrane with macrotrichia and microtrichia present. Costa extending about ¼ of the distance between R5 and M1. Sc ending opposite of Rs. Crossvein rm about 1.7 times as long as stem of median fork. Basal part of M1 faint. A1 running quite divergent from stem of CuA.

Legs. Yellowish-brown. Hind femora with dark apex. Fore basitarsus about 2.1 times as long as fore tibia. Middle tibia with 9 minute anterior setae, 5 short dorsal setae, hind tibia with 13 minute anterior setae and 38 short dorsal setae.

Abdomen. Entirely brown, long and slender.

Terminalia. Light brownish. Gonocoxites with group of very long bristles on ventral side. Posteroventral lobe of gonocoxite with two stout spines (fig. 5). Gonostylus with two lobes (fig. 6). Dorsal lobe rounded apically, bears long broad bristle. Ventral lobe apically acute with spine-like bristle.

Female. Unknown.

Biology. Unknown.

Etymology. The name refers to the occurrence of the species in the Kuril Islands (Kunashir I.).

Comments. The new species is most closely related to P. spinosa Sasakawa, 1961 , P. ostroverchovae Zaitzev, 1984 and P. dallai Zaitzev, 2001 but differs distinctly in the bilobate gonostylus (fig. 6) and by the presence of two very stout spines on the appendage of gonocoxite (fig. 5).

Figures

FIGURES 5 – 6. Phthinia kurilensis sp. n., male terminalia (5 — ventral view, 6 — dorsal view). Abbreviations: lbg — long bristles on ventral side of gonocoxites, plg — posteroventral lobe of gonocoxite, dlg — dorsal lobe of gonostylus, vlg — ventral lobe of gonostylus.