Sindosium lamingtoni, Maté Nankervis, 2020

Maté Nankervis, Jason F., 2020, Description of two new species of Sindosium Johnson, 2007 from Australia (Coleoptera, Ptiliidae), Zootaxa 4895 (4), pp. 528-540 : 533-537

Sindosium lamingtoni sp. n.

( Fig. 3–5 )

Type material. Holotype: (³) AUSTRALIA: QUEENSLAND: 28°13S 153°07E LAMINGTON NP Non Gap 6 November 2001 A. C. Creagh lg

Paratypes (7 exx.): 1 ex. (1³), QUEENSLAND: 28°13S 153°07E LAMINGTON NP Non Gap 6 November 2001 A.C. Creagh lg ; 1 ex. (³), QUEENSLAND: O'Reillys Guesthouse Lamington Nat. Pk. , 19.iii.1982 J. Gallon // Q.M. Berlesate No. 387, Rainforest Sieved Litter ; 1 ex. (³), QUEENSLAND: ME: Brandy Ck Rd, Conway SF 23 April 1979 G. Monteith // QM Berlesate No. 57, 20.20°S 148.42°E Rainforest 60m Sieved litter ; 1 ex. (♀), QUEENSLAND: ME: Brandy Ck Rd, Conway SF 23 April 1979 G. Monteith // QM Berlesate No. 57, 20.20°S 148.42°E Rainforest 60m Sieved litter ; 1 ex., QUEENSLAND: SE: Mt Glorious; 20 September 1979; G.B.Monteith; QM BERLESATE NO.198, 21.17°S 152.45°E; Rainforest Sieved litter ; 1 ex. (³), QUEENSLAND: SE: Bunya Mountains 2 Oct 1979 G. Monteith // QM Berlesate No. 199, 2.651°S 151.34°E Rainforest Stick brushing ; 1 ex. (♀), QUEENSLAND: ex Kroombit Tops , 65 Km SW Gladstone, 22–26 FEB 1982; G.B. Monteith & G. Thomson; Q.M. Berlesate No. 384; Rainforest 1100m Stick brushing

Description. BODY ( Fig. 3A ): Length (TL) 1.15mm (HT), range 1.04–1.27mm (average 1.14mm, n=6). Body ovoid, regularly convex, colour reddish brown, densely pubescent with long and semidecumbent light yellow hairs.

HEAD: Eyes large (EyL= 80 µm [HT], range 73-82 µm, n=4), widely separated (IoD= 217 µm [HT], range 215- 228 µm, n=4), notched posteriorly. Head thinly margined, with only a few shallow, setigerous punctures on the vertex and around the disc of the frons. Antennae long (AnL= 470µm, [HT]), segments 3-7 parallel-sided and elongate, 8 th basally ovoid; 9-10 clubbed, 9 th angulately moniliform basally, 10 th regularly moniliform basally and 11 th oval.

THORAX: Pronotum wide (PW= 0.50 mm [HT], range 0.46–0.53mm, n=6), unicolorous, transverse (1.60–1.73 PW:PL) widest behind middle, regularly convex, lateral margins explanate and slightly elevated, edges strongly serrated and ciliated with backwardly arranged hairs, edge evenly curved til basal quarter, then angled medially to basal corners, base sinuate and narrowly impressed throughout, hind corners lateral edge straight, neither sinuate nor projected. Pronotal surface shiny, microsculture absent, without any trace of medial impression or fovea, narrowed basally, puncturation clearly impressed, punctures 4–5µm wide and spaced 3–5x their diameter, regularly distributed, setigerous, each with a long, semidecumbent hair. Elytra wide (EW= 0.60mm [HT], range 0.60–0.72mm, n=6), convex, oval, base bordered, humerus not denticulate although the serrated elytral edge may give the appearance of a denticle. Surface shiny, microsculpture absent, strongly punctured throughout, punctures setigerous, with semidecumbent yellow hairs densely arranged and of similar length on elytral disc and sides (length [HT] 50–70µm), puncturation densest at base and disc, becoming gradually sparser towards the apex and sides. Lateral edge of elytra expanded from humerus and gradually becoming narrower towards apex, serrated in basal quarter. Scutellum triangular, with a few shallow setigerous punctures.

Alae of usual Sindosium type.

Proventrum ( Fig. 3A ) narrowed longitudinally in front of procoxae, with a single c-shaped fovea on the anterolateral corner of each coxa, as long as the coxal length and deeply impressed. Combined coxal width half that of the anterior prothoracic aperture. Anterior and posterior margins of the proventrite with a row of elongate foveae, anterior row well impressed, posterior one mostly efaced.

Mesoventrum, with well impressed collar which does not clearly slope backwards but ends sharply on to the lateral margins. Latter without distinct humeri, collar with posterior projection elongate and apically rounded. Disc of mesoventrum with a non-carinate projection (keel) that rises abruptly and almost touches the much smaller posterior projection of the collar, posteriorly with a pair of deep and densely pubescent depressions. Mesocoxae close, separated by 1/6–1/8 of their width.

Metaventrum with scattered, long pubescence, dense laterally and absent on disc, anterior edge raised and slightly projected between mesocoxa, posterior edge with falcate, bifid projection ( Fig. 4B ) between metacoxae. Metaepisternal posterior suture ( Fig. 3B ) less divergent from anterior one, partially subparallel.

ABDOMEN ( Fig. 4C ): Each ventrite with a basal row of very fine setae on disc, each seta emerging from a small, fine pore. Setation similar in strength and density on all abdominal segments.

Aedaegus ( Fig. 4E ) typical of Sindosium with well developed parameres, strongly narrowed in the middle and sporting a pair of pores, apices parallel, at apex with three unequal setae, the apical one longest and facing forward, and the two shorter setae set clearly apart from the apical one, aproximate and pointing medially. Median lobe narrower than previous species, with apex converging to a sinuate point, the endophallic pore situated in the apical 4 th and with a very simplified and reduced internal structure that is level with paramere apices. Spermatheca ( Fig. 4D ) bulbous, almost symmetrical, with neck wider than base, regularly converging and aligned with neck.

Etymology: named after Lamington National Park (Queensland, Australia), locality where the majority of the specimens of this new species have been collected.

Diagnosis: see comparative diagnosis under S. queenslandicum n.sp.

Distribution: restricted to South-East Queensland with one isolated record from MEQ. The paucity of records in such a well collected area suggests that the species is either rare or has highly restricted habitat needs which are limited to the higher reaches of mountains peaks in SEQ such as the Scenic Rim and the Bunya Mountains ( Fig. 5 , see discussion). Similar habitats occur in the New South Wales North Coast (NSWNC), so additional populations are expected in this area.

Figures

FIGURE 3. A. Dorsal habitus of holotype of Sindosium lamingtoni sp. nov.; B. Metaventral metepisternum showing the divergent posterior suture (paratype from Lamington N.P.). Scale bar: 0.1mm.

FIGURE 4. A. Ventral view of transparent preparation of Sindosium lamingtoni sp. nov.; B. Posterior end of metaventrite showing bifid projection; C. Abdomen; D. Spermatheca; E. Aedaegus. All material from the Lamington National Park type locality.

FIGURE 5. Distribution map for all known locations of Sindosium in Australia: S. queenslandicum (●): S. lamingtoni (∆). Scale in kilometers.