Thinophilus parvulus, Samoh & Satasook & Grootaert, 2017

Samoh, Abdulloh, Satasook, Chutamas & Grootaert, Patrick, 2017, Eight new species of marine dolichopodid flies of Thinophilus Wahlberg, 1844 (Diptera: Dolichopodidae) from peninsular Thailand, European Journal of Taxonomy 329, pp. 1-40 : 20-23

Thinophilus parvulus sp. nov.

urn:lsid:zoobank.org:act:96F9E2AB-6AC4-43FF-99DE-CB949D3DAE00

Figs 21–24

Diagnosis

A small species with fore tibia bearing 1 short and 1 long black posterodorsal bristle near base.

Etymology

The species name is derived from the Latin ‘ parvulus ’, referring to the very small size of the species.

Type material

Holotype

THAILAND: ♂, Muang, Pattani Province, Prince of Songkhla University , Pattani campus, 6°53 ′ 04.9 ″ N, 101°14 ′ 10.1 ″ E, Malaise Trap, 11 Apr. 2015, A. Samoh leg. ( NHM-PSU ).

Description

Male ( Fig. 21 )

LENGTH. Body 1.8 mm; wing 1.7 mm.

HEAD. Frons and face with shiny dark metallic green ground colour. Face at narrowest point wider than postpedicel. Clypeus about a quarter as long as face. A pair of long divergent black ocellars. No postocellars. A pair of convergent verticals, a little shorter than ocellars. Postcranium dark metallic green. Two converging postverticals, stronger and longer than, and not in row with upper postoculars. Postoculars uniseriate, black above and white below. Antenna brownish. Arista dorsal, 3 times as long as antenna, brown, bare. Basal article short. Palpus yellow, with pale bristly hairs. Proboscis dark brown.

THORAX. Thorax and scutellum shiny dark metallic green, with coppery and purple reflections. No dull black spots. Bristles on thorax black. Acr lacking; 4 dc, anterior 3 dc equally long, prescutellar twice as long. Scutellum with 2 marginals, without lateral hairs. Two very short lower white propleurals.

LEGS. Yellow, tarsomeres 4 and 5 brown. Fore coxa yellowish white, mid and hind coxa entirely brown, extreme tips yellowish. Fore coxa anteriorly with short white bristles. Trochanter bare. Fore femur a little thickened in basal half. Anteroventrally with a row of whitish to pale brownish, long, hair-like bristles, up to three times as long as femur is wide; a little coiled at tip and with a posteroventral row of white bristly hairs, also 3 times as long as femur wide. Fore tibia as long as femur, with 2 remarkable posteroventral bristles in basal half. Mid coxa without exterior bristle. Mid femur thickened in basal ⅔, a little thicker than fore femur; with a row of 4 brownish ventral bristles in basal third, half as long as femur is wide, anteriorly with row of 4 tiny preapicals; a stronger preapical pv. Mid tibia with a short ad and pd. Hind coxa without exterior bristle. Hind femur thickened in basal half, a little thicker than mid femur; double row of pale ventral bristles in apical half, as long as femur is wide, dorsally near base with a few erect bristles, anteriorly with 2 fine preapical bristles, posteriorly with 1 preapical bristle. Hind tibia with a row of ventral bristles, near middle as long as tibia is wide.

WINGS. Without spots. Tp straight, apical part of M 3+4 2 times as long as Tp. Anal vein not reaching wing margin.

ABDOMEN. Shining dark metallic green. Hairs and hind-marginal bristles on tergites short and pale. Sternites with brownish, inconspicuous bristles.

TERMINALIA ( Figs 22–24 ). Phallus long, strap-shaped. Cerci yellowish, not fused and with long apical bristles ( Figs 23–24 ).

Female

Unknown.

Distribution

Southern Thailand (Gulf of Thailand).

Remarks

Thinophilus parvulus sp. nov. is a very small species characterized by the yellowish white fore coxa and the 2 long posteroventral bristles near the base of the fore tibia.

Figures

Fig. 21. Thinophilus parvulus sp. nov., ♂, habitus.

Figs 22–24. Thinophilus parvulus sp. nov., ♂, terminalia. 22. Genital capsule, ventral view. 23. Genital capsule, lateral view. 24. Genital capsule, dorsal view.