Anaclastoctedon antarai, Plant, 2010

Plant, Adrian R., 2010, Anaclastoctedon (Diptera: Empididae: Hemerodromiinae), A New Genus From Asia And Australia, Raffles Bulletin of Zoology 58 (1), pp. 15-25 : 21

Anaclastoctedon antarai , new species

( Figs. 1 , 6, 8 )

Material examined. – Holotype. Male, THAILAND: Chiang Mai, Doi Inthanon National Park, Checkpoint 2, 18°31.559'N 98°29.941'E, 1,700 m, Malaise trap, coll. Y. Areeluck, 2–10 Nov.2006 ( QSBG, T389 ).

Paratypes. – Same data as holotype, 18°31.554'N, 98°29.940'E, 1 female, 24 Nov. –1 Dec.2006 ( NMWC, T1870 ); pan trap, 1 female, 16–17 Nov.2006 ( QSBG, T1907 ) .

Diagnosis. – A larger species with thorax yellow bearing dark sublateral stripes posteriorly. The head is only slightly dorsoventrally flattened with only a few setae ventrally. Antenna with basal segments yellow and postpedicel blackish in both sexes.

Description. – Length 2.3–2.4 mm. Male. Head moderately dorsoventrally compressed ( Fig. 8 ). Black, somewhat shining; face dusted paler. All setae whitish yellow, only a few setae behind mouth and on lower occiput. Mouthparts yellowish, proboscis as long as head is deep. Antenna with basal segments yellow, postpedicel blackish, stylus 4–5× as long as postpedicel.

Thorax clear yellow with scutellum and mediotergite brownish. Scutum posteriorly with two sublateral brown stripes commencing dorsal to notopleural area, continuing to posterior margin; anteriorly with two narrower brownish stripes inside line of dorsocentrals, very narrowly separated by median yellow area. Anepisternum posteriorly and katepisternum obscurely brownish. All setae yellow, 2 pairs of dorsocentrals, a postpronotal, upper notopleural and supraalar all strong; irregular line of fine setulae between notopleural and postpronotal areas.

Legs yellow; T 1 distally and tarsomeres 1–5 brownish; mid and posterior tarsomeres 5 darkened. All setae yellow except double row of denticles beneath F 1 and single row of denticles beneath T 1. F 1 dorsally with linear series of rather erect fine setae; 4–5 av and 4 pv setae, all stout, basal seta of av series slightly displaced ventrally towards median line; a double row of 19–21 av and 14 pv denticles positioned between the large av and pv setae. T 2 anteroapically with a few long hairs. Front tarsomeres 1–2 with a few short straggling hairs, especially ventrally. Mid tarsomere 1 with line of minute erect setulae ventrally.

Abdomen brownish yellow, paler ventrally, sparsely covered with yellow hairs; tergite 5 with stronger yellow setae. Male genitalia ( Fig. 1 ) yellow, hypandrium posteriorly and cercus apically black. Epandrium and hypandrium bearing longish hairs. Major lobe of cercus petiolate basally, much broadened apically, with fine yellow hairs and stout incurved spine-like setae apically; smaller basal lobe apically narrow with strong black apical spine. Phallus with short loop apically.

Wing ( Fig. 6 ) membrane clear, veins yellow (one wing of the holotype has short isolated section of vein M 2 present at margin but absent in other wing). Halter greyish yellow.

Female. Similar to male but lacking two narrow stripes on scutum anteriorly and with dark markings on pleura fainter. Abdomen short pubescent, yellow; tergites 2–5 brown. Cercus contrastingly dark brown. Mid tarsomere 1 with short decumbent setulae ventrally. F 3 with a few stronger setae dorsally near base. Wing with short isolated section of vein M 2 present at margin. Halter whitish.

Etymology. – The specific epithet antarai (Thai) means dangerous, in reference to the fierce raptorial appearance of the front legs.

Remarks. – Known only from northern Thailand at 1,700 m on the upper slopes of Doi Inthanon, Chiang Mai Province.

Figures

Figs. 1–4. Anaclastoctedon new genus: 1. A. antarai new species, male terminalia. 2–4: A. lek new species. 2. apex of male cercus, internal face; 3. postpedicel and stylus of male; 4. male terminalia. Abbreviations: cer, major lobe of cercus; cip, internal process of cercus; epan, epandrium; hypan, hypandrium; ph, phallus and parameral sheath; sur, surstylus.

Figs. 5–8. Anaclastoctedon new genus: 5. A. lek, new species, wing of male; 6. A. antarai new species, wing of female; 7. A. lek, new species, male habitus; 8. A. antarai female habitus. Abbreviation: M2, apical section of vein M2.