Ancyronyx longiparamerus Freitag & Kodada, 2017

Freitag, Hendrik & Kodada, Ján, 2017, Larvae of Ancyronyx Erichson, 1847 (Insecta: Coleoptera: Elmidae) from Sulawesi, using DNA sequences for the assignment of the larval stages, Zootaxa 4299 (1), pp. 121-130 : 127-128

Ancyronyx longiparamerus Freitag & Kodada, 2017

( Figs 2 D; 4B, D, F)

Material examined. 2LL ( NMW, CFM): “ INDONESIA: C Sulawesi, Rd. Km 43 Tentena-Gintu ; mountain creek; cloud forest; submerged wood, c. 1680m asl ., c. 01°48′39′′ S 120°23′17′′E 0 4 Jan.1998 leg. Freitag (Sul 14f)”; 2LL ( CFM [FR132], CKB [SEM]): “ INDONESIA: S Sulawesi, 17.5km NNW Rantepao 1570m asl ., small mount. river “Salu Malarak”, pine forest, run/riffle; submerged wood, c. 02°48′51′′ S 119° 51′21′′E 31 Dec.1997 leg. Freitag (Sul7f)”.

Differential diagnosis (based on presumably sixth instar, HW: 0.33 mm).

Very similar to Ancyronyx tobada except for the following characters: generally the colour is somewhat paler brown, surface of pronotum yellowish on extensive oblique anterolateral portion ( Fig. 2 D); yellowish lateral portions of head extending posteriad; entire posterior half of abdominal segments I and VIII indistinctly paler; terminal abdominal segment dark except of paler brownish apex. Entire ventral side pale. Dorsal tubercles prominent and distinctly elevated ( Figs 4 D, F); anterolateral portion of all thoracic and abdominal segments with glabrous signa, most conspicuous at pronotum. Head ( Fig. 4 B) distinctly tapering anteriad, widest at posterior 0.1. Abdominal segments with scattered short erected setae ( Fig. 4 F); posterolateral protuberances with prominent tubercles, which are distinctly smaller than spiracles; terminal segment IX ( Fig. 4 F) moderately short, ca. 1.9 times as long as wide; basomedian portion distinctly and densely tuberculate; apex slightly emarginated.

Figures

FIGURE 2. Habitus of Ancyronyx larvae from Sulawesi, A: A. schoedli (body length 2.90 mm), B: A. skalei (body length 2.65 mm), C: A. tobada (body length 2.95 mm), D: A. longiparamerus (body length 2.95 mm), E: A. toraja (body length 3.30 mm), F: A. henningi (body length 2.35 mm).

FIGURE 4. Ancyronyx larvae, dorsal (SEM photographs), A: head and pronotum of A. tobada; B: head and pronotum of A. longiparamerus; C: details of abdominal segments I – III of A. tobada with tubercles, lateral abdominal projections, and setae; D: same aspect of A. longiparamerus; E: abdominal segments IX of A. tobada; F: abdominal segments IX of A. longiparamerus.