Thinophilus spinatus, 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 : 27-29

Thinophilus spinatus sp. nov.

urn:lsid:zoobank.org:act:14EBE5D8-334A-4838-9510-8EBB664BC0BD

Figs 30–35

Diagnosis

A medium-sized, slender-legged species with yellow legs, but fore coxa black except for apical third. The femora are spindle-shaped and the fore femur in male as well as in female bear long, brown spinelike bristles.

Etymology

The specific epithet refers to the ventral bristles on the fore femur that are present in both male and female.

Type material

Holotype

THAILAND: ♂, Phang Nga Province, Muang, Bang Phat , 8°21 ′ 48.8 ″ N, 98°34 ′ 38.8 ″ E, Malaise trap, 13 Feb. 2015, A. Samoh leg. ( NHM-PSU ).

Paratypes

THAILAND: 1 ♂, 1 ♀, same collection data as for holotype.

Additional material

SINGAPORE: 1 ♀, Sarimbun (SR3), mangrove, 21 May 2014, J (leg. J. Puniamoorthy; Lee Kong Chian Natural History Museum, Singapore).

Description

Male ( Fig. 30 )

LENGTH. Body 4.3 mm; wing 3.75 mm.

HEAD. Frons and face with shiny dark metallic green ground colour. Face half as wide as length of postpedicel. Clypeus about one third of epistoma, hardly protruding. A pair of long divergent black ocellars. No postocellars. A pair of tiny proclinate verticals at level of front ocellars. Postcranium dark metallic green. Postverticals not differentiated from upper postoculars. Upper and lower postoculars uniseriate, short, black, with a few white bristles behind mouth. Antenna pale brownish. Arista dorsal, 2.5–3 times as long as antenna, brown, not pubescent. Basal article short, brown; rest of arista paler. Palpus yellow, with few black 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; 7 rather short dc, gradually growing longer toward scutellum, ending in a very long prescutellar. Scutellum with 2 long marginals with a tiny hair at outside. Two short black propleural bristles.

LEGS. Yellow but sometimes pale brownish; apical tarsomere 2 of all legs brownish. Fore coxa black, but apical third yellowish brown; mid and hind coxae entirely black. Coxa anteriorly with a short bristle near base and a long bristle at apical third. Fore femur club shaped, thickened in basal half, apical half thin. Ventrally with 4 long black bristles; longest bristle twice as long as femur is wide. Fore tibia about as long as femur, without ventral bristling; tarsomere 1 much longer than following tarsomeres together. Mid coxa with a tiny black exterior bristle near middle; anterior bristles very short, black. Mid femur ventrally without bristles; no preapical av. Mid tibia as long as mid femur; with a crown of short apical bristles; 2 distinct ad. Mid tarsomere 1 twice as long as following tarsomeres together. Hind coxa with a very short black exterior bristle. Hind femur without ventral bristles; no preapical anterodorsal bristles. Hind tibia with 2 very short ad and a crown of apical bristles. Hind tarsomere 1 as long as tarsomere 2.

WINGS. Uniformly brownish tinged, without spots. Tp straight, apical part of M 3+4 almost twice as long as Tp. Anal vein not reaching wing margin.

ABDOMEN. Shining dark metallic green. Hairs and hind-marginal bristles on tergites short, black. Sternites without bristles, except sternite 4 with a tuft of short black bristles in apical half.

TERMINALIA ( Figs 32–35 ). Phallus long, strap-shaped ( Fig. 34 phallus folded). Cerci pale brownish with pale hairs, dorsally fused ( Fig. 33 ).

Female ( Fig. 31 )

LENGTH. Body 3.5 mm long, wing 3.1 mm long.

BODY. Similar to male except for following characters: clypeus ⅓ length of face, bulging; fore femur with 5 strong black ventral bristles up to 3 times as long as femur is wide.

Distribution

Southern Thailand (Andaman Sea) and Singapore.

Remarks

The femora are spindle-shaped and the fore femur in male as well as in female bears long, brown stiff bristles as in T. spinatoides sp. nov. The main difference is that the fore femur in males of T. spinatoides sp. nov. is much more inflated than in T. spinatus sp. nov. For further differences, see under Remarks in T. spinatoides sp. nov.

Figures

Fig. 30. Thinophilus spinatus sp. nov., ♂, habitus.

Fig. 31. Thinophilus spinatus sp. nov., ♀, habitus.

Figs 32–35. Thinophilus spinatus sp. nov., ♂, terminalia. 32. Genital capsule, lateral view. 33. Cerci, dorsal view. 34. Detail of tip of surstyli, ventral view. 35. Detail of surstylus and cercus, lateral view.