Thinophilus parmatoides, 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 : 15-20

Thinophilus parmatoides sp. nov.

urn:lsid:zoobank.org:act:74D863DC-E1F0-4BF9-80FC-8F5339E26D42

Figs 16 , 18–20

Diagnosis

A medium-sized species with a shield-like protuberance on mid tarsomere 2. Mid femur with a cluster of about 10 short spine-like ventral bristles at base.

Etymology

The specific epithet refers to the resemblance with T. parmatus Grootaert & Meuffels, 2001 , also described from southern Thailand.

Type material

Holotype

THAILAND: ♂, Pak Phanang Tawantok , Pak Phanang, Nakhon Sri Thammarat Province, 8°24 ′ 09.4 ″ N, 100°11 ′ 29.9 ″ E, sweep netting, 30 Apr. 2015, A. Samoh leg. ( NHM-PSU ).

Paratypes

THAILAND: 7 ♂♂, 10 ♀♀, same collection data as for holotype (2 ♂♂, 2 ♀♀ at RBINS).

Description

Male ( Fig. 16 )

LENGTH. Body 2.6 mm; wing 2.4 mm.

HEAD. Frons and face with shiny dark metallic green ground colour. Face above as wide as length of postpedicel, near middle half as wide as postpedicel. A pair of long divergent black ocellars. Two very short postocellars. A pair of minute verticals at level of ocellar tubercle. Vertex a little sunken. A pair of minute postverticals. Four black upper postoculars, followed by a row of yellowish uniseriate lower postoculars. Antenna yellowish; only postpedicel dusky above. Arista subdorsal, 3.5 times as long as antenna, brown, with short pubescence. Basal article very short. Palpus yellowish brown, with a few fine black bristles along sides, centrally only minute bristles.

THORAX. Thorax and scutellum shiny dark metallic green, with coppery and purple reflections. No dull black spots. Bristles on thorax black. Acr lacking; 4 short dc of equal length, prescutellar twice as long as preceding dc. Scutellum with 2 long crossing marginals, and a short lateral bristle. No upper propleurals and a few very short lower propleurals.

LEGS. Yellow, but fore coxa completely black, densely set with black bristles; mid and hind coxae brown. Fore and mid trochanters yellow, ventrally brown. Fore femur a little wider than mid femur, especially on basal half; ventrally near base with a few short bristles. Fore tibia longer than femur, with a ventral row of bristles, over entire length, all longer than tibia is wide; bristles near middle longest. Mid coxa with a long, black exterior bristle, half as long as coxa is high; anterior bristles very dense, black. Mid femur with spindle-shaped base; at base a cluster of about 10 black bristles (shorter than femur is wide). Mid tibia much longer than femur; without prominent bristles; ventrally in apical quarter with long hair-like bristles. Mid tarsomere 2 bearing a black shield-like dorsal extension; tarsomere 3 shorter than tarsomere 2, white ( Fig. 16 ). Hind coxa with black exterior bristle. Hind femur a little spindle-shaped at base; ventrally in apical half with only 2 short black bristles. Hind tibia with a short ad near middle.

WINGS. Brownish tinged, without spots. Tp straight, longer than apical part of M 3+4. Anal vein not reaching wing margin.

ABDOMEN. Shining dark metallic green. Hairs and hind-marginal bristles on tergites black. Sternites 2 and 3 with minute hairs; sternite 4 with a few longer black apical bristles.

TERMINALIA ( Figs 18–20 ). Phallus long, strap-shaped. Cerci pale brownish, with pale hairs, dorsally fused ( Fig. 20 ); surstyli and epandrium a little darker than cerci.

Female

LENGTH. Body 2.9 mm long; wing 2.6 mm long.

BODY. Similar to male, except for following characters: mid femur without cluster of ventral bristles at base, mid tarsomere 2 without shield-like protuberance.

Distribution

Southern Thailand (Gulf of Thailand).

Remarks

This species is similar to T. parmatus in having a black shield-like protuberance on tarsomere 2 of the mid leg. There are a few black bristles at the base of the fore femur, a thick tuft of black bristles at the base of the mid femur, long hair-like bristles on the tip of the mid tibia and only short ventral bristles on the hind femur. In T. parmatus , there is a single long bristle at the base of the fore femur, the mid femur has only 4 thin bristles at its base and the hind femur has longer bristles in the apical half. The shield on tarsomere 2 of the mid leg is rounded in T. parmatoides sp. nov., but elongated in T. parmatus ( Fig. 17 ). The shape of the male genitalia is very similar in both species.

Figures

Fig. 16. Thinophilus parmatoides sp. nov., ♂, habitus.

Figs 18–20. Thinophilus parmatoides sp. nov., ♂, terminalia. 18. Genital capsule, ventral view. 19. Genital capsule, lateral view. 20. Cerci, dorsal view.

Fig. 17. Thinophilus parmatus Grootaert & Meuffels, 2001, ♂, habitus.