Anabarhynchus halmaturinus Ferguson & Glatz, 2019

Ferguson, D. J., Glatz, R. V. & Yeates, D. K., 2019, New stiletto flies in the genus Anabarhynchus Macquart (Diptera: Therevidae) from Kangaroo Island, South Australia, Zootaxa 4646 (2), pp. 331-345 : 337-340

Anabarhynchus halmaturinus Ferguson & Glatz sp. nov.

( Figures 5–7 )

http://zoobank.org/NomenclaturalActs/ AC28793B-0F3F-4957-A7DF-54E9234C9001

Type material. Holotype: Male. AUSTRALIA: South Australia: Kangaroo Island (south east), Boobook Hill Sanctuary ; sweep net; 14 September 2008. R.V. Glatz; ( SAMA _29:004693) ( SAMA).

Paratypes: 3 Females. AUSTRALIA : South Australia: 1♀ Boobook Hill Reserve , SE Kangaroo Is., sweep net; 6 October 2008; 35°50.643’S 137°56.813’E; R.V. Glatz; ( RGC _9916)( RGC) ; 1♀ Boobook Hill Reserve , SE Kangaroo Is., sweep net; 6 October 2008; 35°50.736’S 137°56.741’E; R.V. Glatz; ( ANIC _29:029328)( ANIC) ; 1♀ S. Aust; Boobook Hill Reserve, SE Kangaroo Is. , sweep net; 4–Oct–2010 R.V. Glatz , 35°50.669’S 137°57.021’E; ( RGC _13302)( RGC) .

Diagnosis. Frons bulging; male frons 4.9 x anterior ocellus width; with black frontal pile erect broadly distributed and longer than scape; scutum with indistinct grey vitta on brownish grey pubescence; ventral surface of katepisternum with broad, dense patch of pile; prosternal furrow with pile. Femoral setae: fore femur, 2–3 pd, 5–6 p v strong admixed with weak, 3 av; middle femur, 1 pd, 7–8 pv; hind femur 1–2 av. All femora yellow-brown with variable amounts of adpressed black hair-like setae on apical dorsal surfaces

Description. Body length ( Fig. 5 ): 10 mm. Wing length: 9.5 mm. Head. Frons ( Fig. 6 ) bulging; frons width 4.9 x the anterior ocellus; frons brownish grey, area lateral of antenna and along the parafacial pale yellowish grey; area lateral of antenna with conspicuous, irregular shaped, dark grey velvet pubescent mark; frontal pile erect, black, broadly distributed and longer than scape. Scape and pedicel grey, scape 2.7 x pedicel length, surface of flagellum velvet blackish grey. Occiput convex, with grey pubescence and 53–55 black macrosetae on each side. Palpus basal half grey, apical half yellowish with white pile distributed along length; labellum dark grey; prementum with black setae. Thorax. Scutal chaetotaxy black (pairs): np, 4–5; sa, 2; pa, 1; dc, 2; sc, 2. Scutum medially with thin dark brown vitta, lateral surfaces with dark grey vittae. Ventral surface of katepisternum with broad, dense patch of pile; prosternal furrow with pile; pleura grey; coxae grey with long white pile admixed with strong black macrosetae. Wing. Hyaline with grey tinge; veins dark brown; stigma pale brown; costal setae beyond humeral cross-vein arranged in 3–4 rows. Haltere. Pedicel: yellow-brown; dorsal surface of knob basally yellow-brown, apically velvet dark grey. Legs. Femoral setae: fore femur, 2–3 pd, 5–6 p v strong admixed with weak, 3 av; middle femur, 1 pd, 7–8 pv; hind femur 1–2 av. Femora yellow-brown with variable amounts of adpressed black hair-like setae on apical dorsal surface. Tibiae: yellow-brown. Abdomen. Anterior bands on tergites 2–4 black, extending to posterior margin, lateral areas yellow-brown; tergites 5–7 posterior margin yellow-brown, progressively widening posteriorly; lateral edge with thin grey pubescence, and sparse erect white hair; sternites orange-brown, 2–4 with sparse white pile, sternites 5–7 white admixed with sparse, erect, black setae. Terminalia . Holotype type ( SAMA _29:004693): epandrium ( Fig. 7A ). 2.5 x wider than length measured along the mid-line; darkly sclerotised with the lateral margin strongly projecting ventrally and curved inwardly; posterior surface distributed with strong elongated, black setae. Gonocoxite ( Fig. 7B ), anteriorly connected by darkly sclerotised hypandrium and longitudinally by a thin membrane; gonocoxite appear round when viewed ventrally and with strong, black, elongate setae distributed on the posterior surface, weakening medially. The apices of the gonocoxal apodeme are darkly sclerotised, extending to the anterior margin. Inner gonocoxal process robust and with stretched claw-like appearance, of equal length as the gonostylus, the inner subapical surface with a few robust, weakly sclerotised, inwardly directed setae. Gonostylus long and robust, slightly narrowing, with clump of weak setae medially on the dorsal surface, and a clump of longer setae on the ventral inner surface directed inwardly, the apical margin relatively broad, rounded and reflexed dorsally. Ventral lobe posteriorly directed with a narrowly tapered apex. Aedeagus ( Fig. 7C, D ), distiphallus tapered and curved ventrally; dorsal apodeme of parameral sheath broadly triangular, the lateral margins reflexed dorsally; ventral apodeme anteriorly broad and flat with the apical margins broadly flared and apical margin slightly concave; lateral ejaculatory apodeme broad, band-like; ejaculatory apodeme with long lateral lobes.

Variation. Body length in female: 10–11 mm. Wing length in female: 9.5–10 mm. Frons width in female 5.1– 5.3 x anterior ocellus width. Femoral setae: fore femur with 1–3 pd, 1–6 p v weak, 1–3 av macrosetae; middle femur with 1 pd, 2–6 pv, 0–3 av; hind femur 1–2 pv macrosetae. Tergites 4–5 anterior band may have narrow yellow-brown posterior margin. Paratype female ( RGC _9916): Sternite 8 ( Fig.7F ), roundish; anterior medal edge concavely indented; weakly sclerotised with lateral margins darkly sclerotised; medially with a relatively small depressed area, on the anterior margins are conspicuous ‘stump-like’ ventrally directed processes with clusters of robust black setae on the apical and lateral surfaces; posterior and anterolateral margins also with clusters of robust black setae; posterior to this the sclerotised surface abruptly weakens becoming transparent; a ridge of denser sclerites lies along the mid-line that broadened anteriorly supporting a cluster of strong anteriorly directed black setae; the anterior apex with a pair of lobes that support setae of varied strength; flanked either side are densely sclerotised, infolding flaps that lie parallel with the sternites dorsal surface. Furca ( Fig. 7E ), broadly ‘U’ shaped with slender frame; mid-frame with pair of elongate, anteriorly-directed internal struts; anterior beam slender, arched anteriorly with enlarged ‘earlike’ anterolateral processes; anteroventral lobe lateral extensions narrow and elongate, extending beyond the lateral frame.

Etymology. Refers to Kangaroo Island where this species was discovered; the specific epithet ‘ halmaturinus ’ is used for numerous species and subspecies from Kangaroo Island.

Comments. Known from four specimens, one male and three females collected in September and October. Anabarhynchus halmaturinus sp. nov. key to couplet 30 in Lyneborg (2001) and is readily separated from A. spinosus Lyneborg by the broad, dense patch of pile on the ventral surface of the katepisternum, and hind femur with 1–2 av macrosetae at the subapical position. Anabarhynchus spinosus does not have pile on the katepisternum, and the hind femur has 3–4 av macrosetae distributed along the apical half.

Lyneborg (2001) defines montanus species-group as having a depressed area medially on sternite 8, and the furca has well-developed anterior lobes. Anabarhynchus halmaturinus has these characters and is placed in the montanus species-group. Anabarhynchus halmaturinus is closely related to A. abdominalis Kröber , both have yellow-brown legs with tibia darkened apically, the lateral margins of the tergites are orange-brown, and sternite 8 is roundish in shape, thinly sclerotised and on the anterolateral margins of the depressed area are a pair of elevated processes that support clusters of setae, though these in comparison are inconspicuous, only slightly elevated.

Anabarhynchus halmaturinus has thus far only been collected on one property several kilometers inland from the south coast of the Dudley Peninsula (eastern end of KI), although it is very likely more widespread on the island. The habitat where A. halmaturinus was collected is subcoastal mallee woodland on limestone and calcareous sand.

Figures

FIGURE 5. Anabarhynchus halmaturinus sp. nov. Holotype male (SAMA_29:004693), lateral view. Scale line=1.0 mm. [C. Lemann].

FIGURE 6. Anabarhynchus halmaturinus sp. nov. Holotype male (SAMA_29:004693), frontal view. Scale line=0.5 mm. [C. Lemann].

FIGURE 7. Anabarhynchus halmaturinus sp. nov. Holotype (SAMA_29:004693). Terminalia: A, epandrium; (left) dorsal view, (right) ventral view. B, (left) gonocoxite dorsal view, (right) ventral view. C, aedeagus dorsal view. D, aedeagus lateral view. Paratype female (SAMA_29:004688), E, furca. F, sternite 8 ventral view. G, profile of sternite 8. Scale line=0.25 mm. [D. Ferguson].