Ancyronyx konjo, Freitag & Kodada, 2017

Freitag, Hendrik & Kodada, Ján, 2017, A taxonomic review of the genus Ancyronyx Erichson, 1847 from Sulawesi (Insecta: Coleoptera: Elmidae), Journal of Natural History (J. Nat. Hist.) 51 (9 - 10), pp. 561-606 : 588-591

Ancyronyx konjo sp. nov.

( Figures 2 (c); 12(a–d); 18)

Type locality

Small mountain river, 3–5 m wide, Kanre Apia, east of Malino, 1400 m a .s .l ., southwestern Sulawesi, Indonesia .

Type material

Holotype ♂ ( NMW): 'S – SULAWESI 1992 Kanre Apia E Malino 1400 m (28) leg. Schödl 30. IV.’, terminal parts of abdomen and aedeagus glued separately . Paratypes: 3♂♂, 18♀♀ ( NMW, CFM) with same data as holotype . 20 ♂♂, 14 ♀♀ ( NMW, CKB): ‘S – SULAWESI 1992 Kanre Apia E Malino 1400 m (28) leg . Jäch 30 .IV.’; 1♂ ( NMW): ‘S – SULAWESI 1992 Malino-Manipi 1400 m (30) leg . Jäch 1 .V.’.

Diagnostic description

Body 1.55–1.68 mm long, 2.0–2.1 times as long as wide ( BL / EW); EW: 0.75–0.80 mm.

Colouration Figure 2 (c). Elytra with anterior and posterior pair of patches usually present, patches rather faint and brownish in all specimens examined.

Head. HW: 0.40–0.43 mm; ID: 0.23–0.26 mm; labrum glabrous, with moderately dense pubescence and small punctures; clypeus laterally with raised longitudinal granules. Antennae as long as or slightly longer than head width. Gular sutures separate.

Thorax. Pronotum wider than long, widest at about posterior 0.4; PL: 0.49–0.55 mm, MW 0.56–0.60 mm. Metascutellum subtriangular, granulouse. Elytra elongate; EL: 1.12– 1.28 mm, EW: 0.75–0.80 mm, 1.5–1.6 times as long as wide; apices almost conjointly rounded; punctures rather large and deeply impressed, arranged in slightly impressed striae. Mesoventrite anteriorly microreticulate/microstriate. Metaventrite about as long as combined length of pro- and mesoventrite.

Legs approximately as long as body; middle tooth of claw quite large, however still smaller than distal one.

Abdomen. Ventrite 1–4 without glabrous areas; setiferous granules more prominent at anterior and lateral portions, more or less evenly distributed. Male sternite IX ( Figure 12 (a)) 480 μm long; apical margin emarginate; apical edges with fewer than 10 moderately short setae; paraprocts moderately long, one of them almost reaching apical margin; anterior strut long and narrow.

Aedeagus ( Figure 12 (b,c)) broad, elongate, 530 µm long. Median lobe long and broad (117 µm), entirely slightly bent ventrad, comparably slim in lateral view, almost parallelsided in basal two-thirds, arcuate in apical third; apex abruptly narrowed, round; ventral sac weakly sclerotized, slim, plicate, reaching apical 0.07; fibula moderately sclerotized, tapering basad; corona inconspicuous. Phallobase strongly sclerotized, asymmetrical, with basal margin oblique, broadly stout, reaching 0.25 length of aedeagus (lateral view). Parameres moderately long, slender; dorsal and ventral margins almost straight; apical half with c.20 moderately long setae near ventral margin.

Ovipositor ( Figure 12 (d)) total length 660 µm. Stylus long, subcylindrincal; apex with peg-like and spine-like setae. Coxite long and slender; setae dimorphic, spine-like at laterobasal portion, all others setae more or less elongate peg-like; mesal margin inconspicuously pubescent; basal portion about half as long as distal portion. Valvifer about 1.1 times as long as coxite.

Distribution

The species is so far known from two localities on southwestern Sulawesi ( Figure 18 ).

Etymology

The species is named after the ethnic group of the Konjo Pegunungan in whose ancestral homeland (Tinggi Moncong, Gowa Regency, South Sulawesi) this species was discovered by Manfred Jäch and Stefan Schödl, two excellent coleopterologists from Vienna. Konjo is used as noun in apposition.

Comments

The species is generally most similar to Ancyronyx toraja and A. longiparamerus , from which it differs most conspicuously by its deeply impressed elytral punctures and by its parameres that are straight and subparallel-sided from basal 0.35 to apical 0.15.

Ancyronyx konjo was collected at altitudes of 1400 m a.s.l. The microhabitat is unknown.

Figures

Figure 2. Habitus of Ancyronyx species from Sulawesi, (a) Ancyronyx longiparamerus (total length 1.80 mm), (b) Ancyronyx toraja (total length 1.75 mm), (c) Ancyronyx konjo (total length 1.95 mm), (d) Ancyronyx breviparamerus (total length 1.80 mm).

Figure 12. Ancyronyx konjo from Tinggi Moncong; (a) male sternite IX, ventral; (b) aedeagus, lateral; (c) aedeagus, ventral; (d) ovipositor, ventral; (Scale bars = 0.1 mm).

Figure 18. Map of Sulawesi with collecting site of Ancyronyx species based on their label data.