Allodia caligata Magnussen

Magnussen, Trude, Soli, Geir E. E. & Kjaerandsen, Jostein, 2019, Allodia Winnertz from the Himalayas, with nine species new to science (Diptera, Mycetophilidae), ZooKeys 820, pp. 119-138 : 122

Allodia caligata Magnussen sp. n. Figs 1, 2A

Diagnosis.

The dorsal lobe of the gonostylus is distinctly boot-shaped, and together with the slightly bifurcated shape of the median lobe, A. caligata can be separated from other described Allodia species. Moreover, the species is small (<2.7 mm) and has a distinctive colouration of scutum, overall dark, but with yellow humeri (Fig. 1).

Type locality.

NEPAL: Province no. 1 (Kosi Zone), Terhathum District, Basantapur, 2300 m a.s.l.

Type specimens.

Holotype: male. 3 printed labels: (E. NEPAL) Basantapur (2300 m) 27°06'N, 87°23'E - 27°08'N, 87°26'E / May 6, 1972 J. Emoto leg. Kyushu Univ. Col. / TSZD-JKJ-104928 (KUEC; pinned with genitalia in separate microvial). Paratypes: NEPAL: Same data as for holotype, TSZD-JKJ-104939, male (KUEC), TSZD-JKJ-104940, male (KUEC); NEPAL: Gandaki Pradesh, Myagdi District, Dobang Kharka, 28°36'N, 083°24'E, 2400 m a.s.l., Malaise trap, 14-15 Oct 1971, leg. A. Nakanishi, TSZD-JKJ-104930, male (TMU); 14 Oct 1971, leg. A. Nakanishi, TSZD-JKJ-104931, male (KUEC); 20 Oct 1971, Leg. A. Nakanishi, TSZD-JKJ-104932, male (KUEC), TSZD-JKJ-104933, male (KUEC); 23 Oct 1971, Leg. A. Nakanishi, TSZD-JKJ-104934, male (KUEC); Malaise trap, 24-28 Oct 1971, Leg. A. Nakanishi, TSZD-JKJ-104935, male (KUEC), TSZD-JKJ-104936, male (KUEC); 28 Oct 1971, Leg. A. Nakanishi, TSZD-JKJ-104937, male (KUEC); 30 Oct 1971, Leg. A. Nakanishi, TSZD-JKJ-104938, male (KUEC); NEPAL: Sankhuwasabha District, Topke Gola along trail to Thurukba, 27°38'N, 087°35'E, 2600-3700 m a.s.l, 12 Jun 1972, Leg. H. Shima, TSZD-JKJ-104941, male (KUEC); 9 Jul 1972, Leg. P. Norbu, TSZD-JKJ-104942, male (KUEC); BHUTAN: Thimpu District, East of Dochhu La, 27°29'16"N, 089°45'44"E, 2800 m a.s.l, 2 Aug 1993, Leg. T. Saigusa, TSZD-JKJ-104929, male (TMU).

Description.

Body length 2.2-2.7 mm; wing length 2.4-2.7 mm. Colouration. Head and clypeus brown. Mouthparts and palpomeres yellow. Antennae brown, with scape, pedicel, and first half of first flagellomere whitish yellow. Scutum brown, with humeri yellow. Antepronotum yellow, other lateral sclerites brown. Wings clear without markings. Halteres whitish yellow. Legs whitish yellow. Abdomen brown, tergites II-IV with lateral area yellow, larger towards posterior margin, in some specimens only barely visible. Terminalia yellow. Head. Three ocelli, median ocellus smaller than laterals; lateral ocelli touching eye margin. Head covered with fine trichia. Antennae almost twice as long as thorax. Scape and pedicel with several setae on distal third. Flagellomeres cylindrical, densely clothed with fine trichia. First flagellomere twice as long as pedicel. Thorax. Antepronotum with four strong setae. Scutum covered with uniform small, pale setae; strong prealar and postalar setae. Discal bristles absent. Scutellum with two strong bristles. Laterotergite with few shorter setae. Other lateral sclerites bare. Legs. All tibiae with short setae arranged in rows. Mid tibia with six long anterodorsal and on distal 3/4 of segment numerous short posterodorsal bristles present. Hind tibia with eight anterodorsal and six posterodorsal bristles. Wings. Sc short, ending in R. Length of rm equal to stem of posterior fork. Base of anterior fork clearly before base of posterior fork. R1 with distal setae, R5 without. Male terminalia. Tergite IX medially divided, each part rounded, covered with minute trichia, with one strong apical bristle and several small setae. Hypandrial lobe heavily sclerotised and elongated. Gonostylus with dorsal lobe boot-shaped, outer surface with numerous strong setae, denser towards basis. Median lobe with strong setae along posterior border, medially with shallow incision, posterodorsal part pointed, posteroventral part more rounded; ventral border with one long seta situated medially. Ventral lobe elongated, club-shaped, with four strong setae at apex. Basal part of gonostylus blunt, with several short setae along edge. Internal part of gonostylus with long, caudally projecting process.

Etymology.

From Latin, caligatus, booted. Named after the shape of the dorsal lobe of the gonostylus.

Remarks.

The boot-shaped dorsal lobe and the bifurcated median lobe of the gonostylus make A. caligata very distinct. It cannot be confused with, any of the other species described here, or to other Allodia species already described or recorded from the Palaearctic.