Boletina sasakawai Salmela & Kolcsar

Salmela, Jukka & Kolcsar, Levente-Peter, 2017, New and poorly known Palaearctic fungus gnats (Diptera, Sciaroidea), Biodiversity Data Journal 5, pp. 11760-11760 : 11760

Boletina sasakawai Salmela & Kolcsar sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: M. Sasakawa; individualCount: 1; sex: male; preparations: pinned specimen, glued to a card; Location: country: Japan; stateProvince: Honsu; verbatimLocality: Yoshino, Nara; verbatimLatitude: 34.68; verbatimLongitude: 135.83; verbatimCoordinateSystem: decimal degrees; verbatimSRS: WGS84; Identification: identifiedBy: J. Salmela; Event: eventDate: 1960-10-29; Record Level: institutionCode: OSAKA

Description

Male. Head black, vertex covered by pale setae, frons glabrous and face with scattered apical setae; face basally, close to scape, yellowish. Ocelli in a shallow triangle, median ocellus smallest. Clypeus with microtrichosity (pruinosity), elongated (about 1.7 times longer than basally wide). Scape yellowish and brownish, pedicel yellow and first flagellomere basally yellowish. Length ratio of pedicel:first flagellomere 0.24. Flagellomeres dark, palpus yellow.

Thorax dark-brown with pale setosity. Scutum shining, pleural sclerites with weak microtrichosity. Antepronotum yellow. Halter yellow. Femora yellow, bearing pale setae. Trochanters infuscated. Femora yellow, but mid and hind femora ventrobasally infuscated. Legs gradually darkening toward tarsi. Tibial spurs brownish. Length ratio of femur to tibia for fore, mid and hind legs: 0.77, 0.66, 0.66. Length ratio of tibia to basitarsus for fore, mid and hind legs: 1.06, 1.68, 1.68.

Apex of wing slightly infuscated. Bases of M1 and M2, M1+2, r-m, bM1+2, Rs, A1 and Sc bare, other veins setose. C exceeding tip of R5 36 % of the distance between R5 and M1. Sc ending in C at the level of Rs. Length ratio of M1+2:r-m = 1.19. Cu forking slightly beyond M end of r-m. Wing length 5.0 mm.

Abdomen dark-brown, tergites 2-4 laterodistally yellowish. 9th tergite elongated; cerci bearing two rows of combs, that are about equally wide, having ca. 45 stout setae (Fig. 8b). Ventral lobes of gonocoxites laterally rugose, basally with pale setosity, apices bare (Fig. 8a). Dorsal lobe of gonostylus with dense setosity, apical beak pointed, with minute setulae (Fig. 8c). Ventral lobe of gonostylus with no stout setae, sinuous (Fig. 8c). Apices of parameres horned (Fig. 8d, e).

Diagnosis

A large species with a vaguely infuscated wing apex, abdominal tergites 2-4 laterally yellowish and relatively long first flagellar segment (about 4-times the length of the pedicel). The ventral lobe of gonostylus bare, sinuous; in the closely related B. curta it is curved and bearing two stout setae. The apices of parameres with a conspicuous pair of horn-like outgrowths.

Etymology

The new species is named after Dr. Mitsuhiro Sasakawa, Japanese entomologist and the collector of the holotype. The name is a genitive.

Distribution

Known only from the type locality (Yoshino in Japan). The holotype male was collected at the end of October.

Taxon discussion

See above Boletina curta .