Scydmaenilla (Scydmaenilla) brisbanensis Franz
Creators: name: Jałoszyński, Paweł
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Scydmaenilla
Scydmaenilla brisbanensis

description: Scydmaenilla (Scydmaenilla) brisbanensis Franz
(Figs. 96, 102, 108, 113)
Stenichnus (Scydmaenilla) brisbanensis Franz, 1975: 137.
Type material studied. Holotype: Ƥ: four labels (Fig. 108): "Umg. Brisbane / Queensld., Austr. / lg.H.Franz 1970" and "Pa 75" on the reverse side [white, printed, reverse handwritten in blue],"Ƥ" [white with black magins, printed], " Stenichnus / (Scydmaenilla) / brisbanensis m. / det.H.Franz" [white, printed and handwritten in blue], " Typus " [red, handwritten in blue] (SAM).
Diagnosis. Body length about 1.50 mm; elytra stout, EI 1.38; antennal club symmetrical; metatibiae with subapical setal brushes; lateral metaventral carinae present; short median longitudinal groove on posterior pronotal collar present; lateral marginal pronotal carinae barely discernible.
Redescription. Body of female (Figs. 96, 102) strongly convex, elongate and slender, with long appendages, BL 1.51 mm; glossy, uniformly light brown with slightly lighter legs and maxillary palps; vestiture yellowishbrown.
Head (Fig. 96) approximately subtriangular, broadest at eyes, HL 0.25 mm, HW 0.30 mm; tempora distinctly shorter than eyes; vertex distinctly transverse and weakly, evenly convex, anteriorly confluent with convex frons; supraantennal tubercles weakly marked; eyes large and convex, distinctly bean-shaped and oblique in relation to the long axis of the head. Punctures on head dorsum fine and sparse, inconspicuous; setae short, sparse, suberect. Antennae (Fig. 96) moderately long, with distinct but slender and symmetrical club composed of antennomeres IX–XI, AnL 0.60 mm; antennomeres I–VII elongate, VIII about as long as broad, IX–X slightly transverse; XI 1.5 × as long as broad.
Pronotum (Fig. 96) in dorsal view with large and oval discal part broadest near anterior fourth of PL and short posterior collar demarcated by shallow lateral constriction, PL 0.44 mm, PW 0.35 mm; anterior and lateral margins of discal part confluent and rounded; posterior margin weakly arcuate; hind pronotal corners indistinctly marked, blunt and obtuse; posterior collar dorsally distinctly demarcated by sharply marked, narrow and arcuate transverse groove connecting a pair of small lateral ante-basal foveae; additionally in middle ante-basal groove connected to short longitudinal groove extending caudad but not reaching posterior pronotal margin; lateral marginal carinae barely discernible. Punctures on pronotal disc very fine and inconspicuous, those on posterior collar distinct, but shallow and sparse; setae long, sparse and suberect to erect.
Elytra (Fig. 96) oval and more convex than pronotum, broadest between middle and anterior third, EL 0.83 mm, EW 0.60 mm, EI 1.38; humeral calli moderately distinct, developed as elongate protuberances; elytral apices separately rounded. Punctures on elytral disc only slightly more distinct than those on pronotum, shallow, sparse and inconspicuous; setae moderately long, sparse and suberect. Hind wings well-developed, twice as long as elytra.
Legs (Fig. 96) long and slender; all tibiae straight or nearly straight, each metatibia with short and slender subapical setal brush.
Spermatheca (Fig. 113) nearly spherical, diameter 0.055 mm, slightly projected at insertion site of thin ductus spermathecae; accessory gland not found.
Male. Unknown.
Distribution. Eastern Australia: southeastern Queensland.
Remarks. Scydmaenilla brisbanensis is most similar to S. sydneyana. Both species share a similar body shape and proportions of body parts, and are unique within the genus in having the lateral metaventral carinae (Figs. 102, 103; lmtc). They differ in the pronotal structures: S. brisbanensis has very indistinct lateral marginal carinae of pronotum (distinct and well-visible in posterior half in S. sydneyana), small and nearly round lateral ante-basal pronotal foveae (large and developed as subtriangular impressions in S. sydneyana), and the ante-basal transverse groove connected in middle to very short but distinct median longitudinal groove extending caudad, but not reaching posterior pronotal margin (longitudinal groove absent in S. sydneyana).
description: Published as part of Jałoszyński, Paweł, 2013, Revision of subgenera of Stenichnus Thomson, with review of Australo-Pacific species (Coleoptera, Staphylinidae, Scydmaeninae), pp. 39-79 in Zootaxa 3630 (1) on pages 75-76, DOI: 10.11646/zootaxa.3630.1.2, http://zenodo.org/record/283467