Tinaroo agostii Yin and Li, 2016

Yin, Zi-Wei & Li, Li-Zhen, 2016, First species of Tinaroo Chandler from outside Australia (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4085 (1), pp. 147-150 : 147-150

Tinaroo agostii Yin and Li , new species

( Figs 1 , 2 )

Type material. Holotype: INDONESIA: male, ‘ INDON: Sulawesi Barat, Penanang (W of Mamasa ), 13.iv.1991, 1600 m, montane prim. forest, leaf litter, #19, leg. D. Agosti, F91756 / HOLOTYPE (red) ♂, Tinaroo agostii sp. n., det. Yin & Li, 2016’ ( MHNG; the holotype is preserved in Euparal, with right elytron, hind legs, and abdominal segments V–VII missing) . Paratypes: INDONESIA: 2 females, with same collecting data as the holotype, each specimen with a yellow type label similar to that of the holotype except ‘ PARATYPE ♀ ’ ( MHNG) .

Diagnosis. Head, pronotum, elytra and abdomen each with a few macrosetae in addition to normal pubescence. Pronotal disc strongly convex, with setose lateral longitudinal sulci. Each elytron with shallow discal striae; marginal striae present in basal half of elytral flank. Male with posterior part of vertex, pronotal disc, and mesotibiae modified.

Description. Male ( Fig. 1A ). Length 1.76 mm. Body uniformly light reddish-brown, mouth parts, tibiae and tarsi lighter in color.

Head ( Fig. 2A, 2B ) rectangular, slightly wider than long, HL 0.33 mm, HW 0.36 mm, finely punctate; lacking frontal rostrum, antennal tubercles distinctly raised; vertex glabrous, convex, with two nude foveae connected by reversed U-shaped sulcus, sulcus becoming faint in anterior half; short median carina extending from level of anterior margin of vertexal foveae to near posterior margin of head; posterior part of vertex with two tufts of dense setae; clypeus covered with long pubescence, with rounded anterior margin. Each eye with about 22 facets, ocular-mandibular carinae extending to anterior eye margins; post-ocular margins roundly narrowing posteriorly, almost as long as eye length. Venter with single median fovea, lacking carina nor sulcus, with long pubescence directed ventrally. Total length of antenna 1.01 mm, length of each antennomere: I 0.11 mm, II 0.08 mm, III 0.07 mm, IV 0.06 mm, V 0.07 mm, VI 0.07 mm, VII 0.09 mm, VIII 0.07 mm, IX 0.11 mm, X 0.11 mm, XI 0.17 mm; scape broadest at basal third, following antennomeres each longer than wide; antennal clubs loosely formed by apical three antennomeres. Maxillary palpomere I minute, II slender and elongate, pedunculate in basal half, III elongate, apex slightly broader than base, IV largest, fusiform, expanded laterally, with small palpal cone at apex.

Pronotum ( Fig. 2A, 2B ) wider than head, as long as wide, PL 0.43 mm, PW 0.43 mm; disc strongly convex, finely punctate, with recumbent pubescence directed anteriorly, with two macrosetae mesal to lateral sulci, disc in lateral view distinctly higher than level of vertex, apicomedian part of disc strongly protrude anteriorly; median antebasal fovea distinct, areas between median and lateral antebasal foveae lacking spines, lateral antebasal foveae covered by densely setose lateral longitudinal sulci, areas lateral to sulci broadly and shallowly concave, each cavity with elongate, oval patch of short, dense setae; inner and outer pair of basolateral foveae distinct. Paranotal carinae and small lateral procoxal foveae present.

Elytra convex dorsally, slightly wider than long, EL 0.50 mm, EW 0.54 mm, strongly narrowed toward base; each elytron with two distinct basal foveae, with complete sutural stria; discal stria shallow and short; lacking subbasal and subhumeral foveae; marginal stria present in posterior half of elytral flank. Each elytron with several macrosetae. Metathoracic wings absent. Mesoventrite densely setose at middle; with setose lateral foveae not forked, situated posterior to median foveae that are widely separated, opening into shared setose transverse impression; with setose lateral mesocoxal foveae. Metaventrite with setose lateral foveae, posterior margin with deep, thin slit. Mesotibia with large, sharp apical spur ( Fig. 2D ).

Abdomen with five exposed tergites, gradually narrowing from base toward apex, AL 0.50 mm, AW 0.53 mm. Tergite IV (first visible tergite) largest, longer than half of entire abdominal length, with a few macrosetae, mediobasal foveae at lateral ends of setose basal sulcus, with pair of setose basolateral foveae; tergites V and VI of similar length; VII as long as V and VI combined. Sternite IV (second visible sternite) with mediobasal foveae at short basal sulcus, with two pairs of basolateral foveae, sternites V and VI short at middle, VII long.

Aedeagus ( Fig. 2E, 2F ) 0.29 mm long, with large basal capsule and foramen, with ventral membrane (omitted in the figures); median lobe slender and simple; dorsal lobe elongate, with additional thin, long projections at middle and apex.

Female ( Fig. 1B ). Similar to male in general habitus, elytra and legs distinctly shorter, posterior part of vertex and apical part pronotal disc not modified, metatibiae lacking spur. Each eye composed of about 15 facets. Width of genital complex ( Fig. 2G ) 0.20 mm. Measurements: BL 1.74–1.76 mm, HL 0.36–0.37 mm, HW 0.36–0.37 mm, PL 0.40–0.41 mm, PW 0.39–0.40 mm, EL 0.46–0.48 mm, EW 0.55–0.56 mm, AL 0.50–0.52 mm, AW 0.53–0.54 mm; total length of antenna 0.89–0.93 mm, length of each antennomere: I 0.10–0.11 mm, II 0.08 mm, III 0.06–0.07 mm, IV 0.05 mm, V 0.07 mm, VI 0.06 mm, VII 0.07 mm, VIII 0.05–0.06 mm, IX 0.09 mm, X 0.09–0.10 mm, XI 0.17 mm.

Comparative notes. Tinaroo agostii is relatively small, slender, and is the only species of the genus that bears setose pronotal lateral sulci; when combined with the male setose vertex, form of the modified anterior part of the pronotal disc in the male, and distribution, the new species can be readily separated from all its Australian congeners. Discovery of an additional Tinaroo species in Sulawesi indicates that the endemic Australian batrisine genera probably have a wider distributional range than it is currently known, as supposed by Chandler (2001: 255).

Habitat. The new species was collected from leaf litter samples of a primary forest in the montane area of western Sulawesi.

Distribution. Indonesia: Sulawesi.

Etymology. The specific epithet is dedicated to the Swiss myrmecologist Donat Agosti, who collected all the type specimens.

Figures

FIGURE 1. Dorsal habitus of Tinaroo agostii. A. Male. B. Female. Scales: 0.5 mm.

FIGURE 2. Diagnostic features of Tinaroo agostii (A, B, D, E, F. male; C, G. female). A. Head and pronotum, in lateral view. B, C. Same, in dorsal view. D. Mesotibia. E. Aedeagus, in lateral view. F. Same, in ventral view. G. Genital complex. Scales: A – C = 0.2 mm; D = 0.1 mm; E – G = 0.05 mm.