Sciacharoides thompsoni (Franz)

Jałoszyński, Paweł, 2014, ' The curse of Horaeomorphus ': taxonomy of misplaced Australian Cyrtoscydmini (Coleoptera: Staphylinidae: Scydmaeninae), Zootaxa 3828 (1), pp. 1-76: 56-57

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Sciacharoides thompsoni (Franz)

comb. n.

Sciacharoides thompsoni (Franz)  comb. n.

( Figs. 129–140View FIGURES 129 – 133View FIGURES 134 – 136View FIGURES 137 – 140, 160, 164View FIGURES 160 – 167, 168– 170View FIGURES 168 – 173, 197View FIGURES 193 – 198 a)

Horaeomorphus thompsoni Franz, 1975: 145  , Fig. 122View FIGURES 121 – 128 a, b.

Type material studied. Holotype: AUSTRALIA: ♂: six labels ( Fig. 164View FIGURES 160 – 167): "Umg. [i.e., env.] Maipoton [sic!] / Queensld., Austr. / lg. H. Franz 1970 " [white, printed], " Horaeomorphus  / thompsoni  / m / det. H. Franz" [white, handwritten and printed], " Typus " [red, handwritten], " SAMAAbout SAMA Database / No. 25 -037021" [white, printed], " SAMAAbout SAMA Digital Image / 20. 8. 2013 " [green, printed and handwritten], " SCIACHAROIDES  / thompsoni ( Franz, 1975)  / det. P. Jałoszyński, 2014 " [white, printed] ( SAMAbout SAM).

Additional material (7 exx.). 2 ♀♀, New South Wales, Wild Cattle Creek State Forest, "in moss on fallen tree", 30.v. 1993, leg. T. Gush; 1 ♂, New South Wales, Pines Creek State Forest, "in upright dead tree stump", 31.v. 1993, leg. T. Gush; 1 ♂, New South Wales, Chichester State Forest, "in debris on log", 1992, leg. T. Gush; 1 ♀, New South Wales, Wang Wauk State Forest, "in moss on fallen tree and stump", 26.iv. 1993, leg. T. Gush; 1 ♂, Queensland, Mt. Glorious, leaf and log litter with fungi (Berlesate), 21.xii. 1990, leg. J. Lawrence; 1 ♂, Queensland, Mt. Glorious, 800 m, bark and log litter, 1978, leg. S. & J. Peck (specimens in ANICAbout ANIC and cPJ).

Revised diagnosis. Male: BL 1.68–1.80 mm; pronotum with antebasal transverse groove interrupted in middle and with distinct internal pair of pits; mesanepisterna without setal brushes; subtriangular apical region of aedeagus in ventral view distinctly demarcated from basal capsule by lateral constriction. Females are unremarkable and may not be possible to identify if not collected together with males.

Redescription. Body of male ( Fig. 160View FIGURES 160 – 167) strongly convex, elongate but relatively stout, with long appendages, BL 1.68–1.80 mm (mean 1.74 mm); cuticle glossy, body uniformly light brown with slightly lighter appendages, vestiture yellowish.

Head ( Fig. 129View FIGURES 129 – 133, 160View FIGURES 160 – 167) in dorsal view rounded, broadest at eyes, HL 0.30–0.33 mm (mean 0.31 mm), HW 0.33–0.38 mm (mean 0.34 mm); tempora slightly longer than eyes, strongly curved posteromesally; vertex weakly convex; frons subtrapezoidal. Eyes moderately large and moderately projecting laterally from the head silhouette, finely faceted. Punctures on head dorsum fine and sparse, inconspicuous; setae short, on frons and anterior part of vertex sparse and suberect, tempora and posterior margin of vertex with dense bristles directed posteriorly and slightly posterolaterally. Antennae slender ( Fig. 160View FIGURES 160 – 167), with five terminal antennomeres forming indistinct club, AnL 0.83–0.90 mm (mean 0.86 mm); antennomeres I–VI elongate (but only II strongly), VII–VIII about as long as broad or barely discernibly longer than broad; IX–X slightly transverse; XI only slightly longer than X, 1.4 x as long as broad, with blunt apex.

Pronotum ( Fig. 160View FIGURES 160 – 167) indistinctly elongate, broadest between middle and anterior third, PL 0.40–0.45 mm (mean 0.44 mm), PW 0.38–0.40 mm (mean 0.39 mm); anterior and lateral margins rounded; posterior margin shallowly bisinuate; base of pronotum with shallow and narrow transverse groove interrupted in middle and with two pairs of pits: larger internal pair and smaller external pair. Punctures on pronotal disc fine and inconspicuous; setae sparse, thin, short and suberect, sides of pronotum with moderately dense bristles.

Elytra ( Fig. 160View FIGURES 160 – 167) oval, broadest distinctly anterior to middle, EL 0.98–1.03 mm (mean 0.99 mm), EW 0.70–0.80 mm (mean 0.75 mm), EI 1.28–1.39 (mean 1.33); basal impressions short but distinct; elytral apices separately rounded. Punctures on elytral disc much more distinct than those on pronotum, in anterior median area separated by spaces comparable to diameters of punctures, on sides and posteriorly punctures reducing in diameter and depth; setae much longer than those on head and pronotum, moderately dense, curved and erect. Hind wings well developed, about twice as long as elytra.

Legs ( Fig. 160View FIGURES 160 – 167) long and slender, without modifications.

Aedeagus ( Figs. 168–170View FIGURES 168 – 173) relatively stout, AeL 0.33 mm, in ventral view drop-shaped with demarcated and strongly narrowing subtriangular apical region; internal armature composed of H-shaped subapical structure proximally connected to two lateral bunches of thin hair-like sclerites and with a similar bunch of shorter sclerites in middle; H-shaped structure in erected aedeagus ( Figs. 169–170View FIGURES 168 – 173) protruding distally and hair-like sclerites projecting outwards from the surface of endophallus; parameres slender, each with three apical setae.

Female. Similar to male, externally indistinguishable; BL 1.55–1.73 mm (mean 1.67 mm); HL 0.28–0.30 mm (mean 0.28 mm), HW 0.30–0.33 mm (mean 0.31 mm), AnL 0.78–0.80 mm (mean 0.79 mm); PL 0.38–0.43 mm (mean 0.41 mm), PW 0.35–0.38 mm (mean 0.36 mm); EL 0.90–1.03 mm (mean 0.98 mm), EW 0.70–0.75 mm (mean 0.73 mm), EI 1.29–1.37 (mean 1.33).

Distribution ( Fig. 197View FIGURES 193 – 198 a). South-eastern Australia: Queensland and New South Wales.

Remarks. The name "Maipoton" on the locality label is misspelled Mapleton. This species highly resembles Sciacharoides eucalypti  comb. n., but is clearly larger. Small differences in the shape of the aedeagus and its internal structures and in proportions of antennomeres may fall within an interindividual variability of a single species. However, a small available sample is insufficient to decide whether Sciacharoides thompsoni  and Sciacharoides eucalypti  are synonymous names; this problem is pending further study.


South Australia Museum


South African Museum


Australian National Insect Collection














Sciacharoides thompsoni (Franz)

Jałoszyński, Paweł 2014


Horaeomorphus thompsoni

Franz 1975: 145