Thinophilus boonrotpongi, 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 : 4-7

Thinophilus boonrotpongi sp. nov.

urn:lsid:zoobank.org:act:21C6EEB3-B179-432F-8D83-A863422A249D

Figs 1–5

Diagnosis

A medium-sized species with black fore coxa bearing long white bristles. Apical half of fore tibia pale, almost white with black tip. Tip of all apical tarsomeres black.

Etymology

This species is dedicated to Dr Singtoe Boonrotpong, promoter of the PhD thesis of the first author, in recognition of his help and support during the current project.

Type material

Holotype

THAILAND: ♂, Sai Thai, Muang , Krabi Province, 8°03 ′ 23.5 ″ N, 98°53 ′ 38.2 ″ E, sweep netting, 27 Feb. 2015, A. Samoh leg. ( NHM-PSU ).

Paratypes

THAILAND: 7 ♂♂, 10 ♀♀, same collection dat os for holotype; 1 ♂, 7 ♀♀, Khlong Phon, Khlong Thom, Krabi Province, 7°48 ′ 11.2 ″ N, 99°10 ′ 11.9 ″ E, sweep netting, 13 Jun. 2015, A. Samoh leg.; 1 ♂, 1 ♀, Ban Bakan Tohtid, Langu, Satun Province, 6°47 ′ 29.8 ″ N, 99°48 ′ 53.5 ″ E, sweep netting, 3 Jun. 2015, A. Samoh leg.; 1 ♂ (with yellow femora), Ban Bakan Tohtid, Langu, Satun Province, 6°47 ′ 29.8 ″ N, 99°48 ′ 53.5 ″ E, sweep netting, 4 Jun. 2015, A. Samoh leg. ( RBINS); 3 ♂♂, 2 ♀♀, Bo Sane, Thappud, Phang Nga Province, 8°27 ′ 29.7 ″ N, 98°36 ′ 17.8 ″ E, sweep netting, 13 Feb. 2015, A. Samoh leg.

Description

Male ( Fig. 1 )

LENGTH. Body 3.5 mm; wing 2.8 mm.

HEAD. Frons and face with shiny dark metallic green ground colour. Face as wide as length of postpedicel. Clypeus about one-third of epistoma, protruding. A pair of long divergent black ocellars. Two very short postocellars. A pair of convergent proclinate 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, white and becoming multi-seriate below. Antenna brownish at tip and above, yellowish below. Arista dorsal, twice as long as antenna, brown, bare. Basal article short. Palpus yellowish to brown, with 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; 4 equally long dc in one row, preceded by a short bristle and a longer prescutellar outside the row. Scutellum with 2 marginals, without lateral hairs. Two short white upper propleural bristles and 2 longer lower propleural bristles.

LEGS. Brownish, but tibiae and tarsi pale. Fore coxa completely black; mid and hind coxae entirely black. All femora generally black. All tibiae with basal half brownish, becoming whitish towards tip. Fore tibia with black spot on tip ventrally. All tarsomeres whitish, but tip of terminal tarsomere black. Coxa anteriorly with long white bristles in apical half. Trochanter with long white bristles. Fore femur thickened in basal two-thirds. Ventrally at base with 2 rows of white bristles, longer than femur is wide, apical two-thirds with few short black bristles; with 3 strong equally long posterior preapical bristles. Fore tibia shorter than femur, ventral bristles short; posteroventral bristles of tibia on basal third longer than following bristles. Tarsomere 1 densely set with spine-like bristles. Mid coxa: exterior bristles white and longer than coxa; anterior bristles long and white. Mid femur thinner than fore femur; with row of black ventral bristles, longer at base. Mid tibia with a long anterodorsal at apical quarter; 2 dorsal and 2 pd; crown of apicals, ventral bristles longest. Hind coxa with short white exterior bristles. Hind femur a little thicker than mid femur; a long dorsal and anterodorsal bristle at apical third; row of black ventral bristles about as long as femur is wide. Hind tibia with 2 anterodorsal and 2 shorter dorsal bristles and a crown of long apicals. Hind tarsomere 1 long but shorter than tarsomere 2.

WINGS. Uniformly brownish tinged, without spots. Tp straight, apical part of M 3+4 1.5 times 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 with short white bristles.

TERMINALIA ( Figs 3–5 ). Phallus long, strap-shaped. Cerci pale brownish, with pale hairs; epandrium black. Cerci not fused ( Fig. 5 ).

Female ( Fig. 2 )

LENGTH. Body 3.6 mm long; wing 3 mm long. Larger than male.

BODY. Similar to male except following characters: clypeus ¼ length of face, bulging; fore coxa with short white bristles only, fore femur with minute bristles, mid and hind femora also with minute ventral bristles; sternites with short white bristling.

Distribution

Southern Thailand, only known from Andaman Sea coast.

Remarks

Thinophilus boonrotpongi sp. nov. is quite unique in having a black fore coxa bearing long white bristles, combined with the apical half of the fore tibia almost white with a black apex. All apical tarsomeres are also darkened. Only T. nitens Grootaert & Meuffels, 2001 has white bristles on the fore coxa, with a single black bristle among them, but the fore coxa itself is yellow. Among the material examined

was one male specimen with all femora and tibiae yellow that we attribute to T. boonrotpongi sp. nov. The tarsi are yellowish and not whitish (cf. Fig. 1 ). Other characters, such as the fore femur with long white soft bristles at the base, the general bristling of the legs and the male genitalia, also suggest that it represents T. boonrotpongi sp. nov. A future molecular analysis should ascertain if there is a genetic difference.

Figures

Figs 1–2. Thinophilus boonrotpongi sp. nov. 1. ♂, habitus. 2. ♀, habitus.

Figs 3–5. Thinophilus boonrotpongi sp. nov., ♂, terminalia. 3. Genital capsule, lateral view. 4. Apex of surstylus, dorsal view. 5. Cerci, dorsal view.