Stilbomyella anomala Colless 1998, n.sp.
Creators: name: Colless, D. H.
Publisher: name: Zenodo
Year: 1998
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Calliphoridae
Stilbomyella
Stilbomyella anomala

description: <i>Stilbomyella anomala</i> n.sp. <i>Holotype:</i> female; Palmerston NP, 1200 ft, Queensland, 18 April 1971, D.A. Duckhouse, (light trap). Ex spirit via ethyl acetate. ANIC No. 6143. The type locality is near the Palmerston Highway, between Innisfail and Millaa Millaa, north Queensland. A small dark species, body length 7.0 mm. Female. <i>Head.</i> Interfrons dark brown; parafrontals, parafacials, genae, and postorbits golden pollinose; hairs of genae pale golden. In facial view inner surface of facial ridge dark, continuing as a black line through vibrissa and ventrally along subcranial margin. Frons relatively narrow, 0.2 of head width. Vertical bristles strong, inner verticals decussate, parafrontal with 2 strong proclinate frontoorbitals and 1 exclinate (prevertical); ocellar bristles not differentiated. Carina in lateral view quite strongly protruding, curved; in facial view, more or less parallelsided on ventral two-thirds, tapering dorsally; separated from epistome by a distinct but rounded notch. Antenna completely dark; segment 3 a little shorter than carina and than arista. Palps dark. Gena 0.4 of eye height. <i>Thorax.</i> Scutum and scutellum metallic green, the former (in glancing light) with trace of silvery frosting on humeri and notopleura, and (in some lights) an ill-defined median dark vitta. Scutellum with preapical bristles rather erect (but not "spiny", as typical of <i>Silbomyia).</i> Pleura metallic green with large silver-pollinose area over anepisternite and stemopleuron. Propleuron bare. <i>Legs.</i> Fore tibia with 1 <i>pv,</i> no <i>pd.</i> Mid femur with usual group of 3 strong <i>a</i> bristles near centre; mid tibia with 2 strong <i>ad</i> and 1 <i>pv.</i> Hind coxa bare on posterodorsal surface. <i>Wing.</i> Costa setulose ventrally between Sc and RI' as in <i>Silbomyia,</i> but not apical to RI' Membrane strongly infuscated anterobasally, as far back as R 4+s, and along M2 and M4. M-bend index 0.7. Lower calypter dark on apical half. <i>Abdomen.</i> T 1+2 dark, other tergites metallic green with apical dark bands in some lights; T 3 and T 5 with lateral silver-pollinose spots ventrally. T 3 with single strong median bristle (presumably an aberration). Stemites dark, with sparse, coarse bristles. Male unknown. Notes. Despite the setulose ventral surface of the costa (a "key-character" for <i>Silbomyia), anomala</i> seems best accommodated in <i>Stilbomyella</i> by virtue of the attributes given in the key, especially the unusual lack of differentiated ocellar bristles. As shown in Part 3 (Figs 18-22), it clusters closely with that genus phenetically.
description: Published as part of <i>Colless, D. H., 1998, Morphometrics in the genus Amenia and revisionary notes on the Australian Ameniinae (Diptera: Calliphoridae), with the description of eight new species, pp. 85-123 in Records of the Australian Museum 50 (1)</i> on page 98, DOI: 10.3853/j.0067-1975.50.1998.1275, http://zenodo.org/record/4652889