Amaurodera bulbosa Pace 2008
Creators: name: Assing, Volker
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Amaurodera
Amaurodera bulbosa

description: Amaurodera bulbosa PACE, 2008
(Figs 164–165)
Amaurodera bulbosa PACE, 2008a: 119 f.
Amaurodera discoidea PACE, 2008a: 121 f., partim.
Type material examined: A. bulbosa: Holotype ♀: “♀ / SABAH: Poring Hot Springs, 500 m, 11.V.1987, Burckhardt - Löbl / Holotypus Amaurodera bulbosa mihi, det. R. Pace 2000 / Amaurodera bulbosa n. sp., det. R. Pace 2000” (MHNG). Paratype ♀: same data as holotype (MHNG).
A. discoidea: Paratypes: 2 ♂♂: “♂ / SABAH: Poring Hot Springs, 500 m, 13.V.1987, Burckhardt - Löbl / Paratypus Amaurodera disoidea mihi, det. R. Pace 2000 / Amaurodera discoidea n. sp., det. R. Pace 2000 / Amaurodera bulbosa Pace, det. V. Assing 2016” (MHNG, cAss); 1 ♂: same data, but “ 7.V.1987 ” (MHNG).
Comment: The original description of A. bulbosa is based on two females from “ Sabah, Poring Host Springs, 500 m ” (PACE 2008a). The male paratypes of A. discoidea, which were collected in the type locality of A. bulbosa, belong to this species, too.
Redescription: Body length 3.8–4.4 mm; length of forebody 1.9–2.2 mm. Other measurements: head width: 0.54–0.62 mm; length of pronotum: 0.78–0.85 mm; width of pronotum: 0.57–0.63 mm; elytral length at suture: 0.45–0.48 mm; elytral width: 0.80–0.85 mm. Coloration: head and pronotum reddish-brown to blackish-brown; elytra pale-reddish to reddish-brown with the posterolateral portions more or less extensively, diffusely darker; abdomen with segments III–IV, or III–V, and VIII–X and the posterior portion of VII reddish to brown, and the remainder dark-brown to blackish-brown; legs yellowish; antennae pale-brown to brown with the basal three antennomeres yellowish-red and the apical antennomeres more or less extensively dark-yellowish; uniformly yellowish or with all or some of antennomeres IV–VIII darker; maxillary palpi yellowish-red with the terminal palpomere yellowish.
Head 1.08–1.14 times as long as broad; postero-lateral outline between eyes and posterior constriction convex in dorsal view; median dorsal portion not impressed; punctation sparse and vey fine; interstices without microreticulation.Eyes small, one-third to half as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna long and slender, 2.2–2.4 mm long; antennomere IX twice as long as broad and antennomere X more than 1.5 times as long as broad.
Pronotum slender, 1.44–1.48 times as long as broad, probably without sexual dimorphism; dorsal surface with very dense microgranules and opaque; midline with deep and narrow median sulcus reaching neither anterior nor posterior margins; antero-lateral portions with three long and rather stout setae on either side and with scattered very short and fine setae.
Elytra 0.56–0.58 times as long as pronotum; punctation extremely fine (barely noticeable even at high magnification) and moderately dense; microreticulation absent. Hind wings fully developed. Legs including tarsi long and slender; metatarsomere I approximately as long as the combined length of II and III.
Abdomen narrower than elytra; tergites III–V with moderately deep anterior impressions; punctation and pubescence very sparse; tergal surfaces without distinct microsculpture, indistinct shallow traces of microsculpture composed of transverse meshes may be visible only on anterior tergites at high magnification (100 x); posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII weakly convex and serrate.
♂: median lobe of aedeagus (Figs 164–165) small, 0.38– 0.44 mm long; ventral process short and sinuate in lateral view, broad and apically rounded in ventral view.
♀: spermatheca of similar shape as in A. kraepelini, with the proximal portion of the capsule distinctly dilated (see figure 27 in PACE 2008a).
Comparative notes: Amaurodera bulbosa differs from A. discoidea, with which it was confounded by PACE (2008a), by numerous characters, particularly much smaller eyes (A. discoidea: eyes large and strongly bulging, at least as long as postocular region from posterior margin of eye to posterior constriction of head), smaller body size (A. discoidea: body length 5.0 mm; length of forebody 2.4 mm; length of pronotum 0.90 mm), the chaetotaxy of the pronotum (antero-lateral portions with only two long setae on either side, these setae finer and shorter than in A. bulbosa, and with numerous short setae), uniformly yellowish legs (A. discoidea: meso- and metafemora apically infuscate), a less distinctly bicoloured abdomen, the morphology of the aedeagus, and the completely different shape of the spermatheca.
Distribution and natural history: This species is currently known only from the type locality in Sabah (altitude: 500 m). Amaurodera frondium and A. calicitheca were found in the same locality.
description: Published as part of Assing, Volker, 2017, On the Lomechusini fauna of the East Palaearctic and Oriental regions, with a focus on the genera Orphnebius and Amaurodera (Coleoptera: Staphylinidae: Aleocharinae), pp. 63-106 in Beiträge Zur Entomologie = Contributions to Entomology 67 (1) on page 98, DOI: 10.21248/contrib.entomol.67.1.063-106, http://zenodo.org/record/5742262