Ancyronyx henningi 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 : 129

Ancyronyx henningi Freitag & Kodada, 2017

( Fig. 2 F)

Material examined. 2 LL ( NMW, CFM [FR131]): “ INDONESIA: C Sulawesi, Rd. Km 32 Tentena-Gintu ; mountain creek, grass-land; submerged wood, c. 1600m asl., c. 01°48′10′′ S 120°28′10′′E 0 4 Jan.1998 leg. Freitag (Sul 13f)”.

Differential diagnosis (based on presumably fifth instar, HW: 0.33 mm). In most characters very similar to Ancyronyx tobada except for: dominantly pale brown dorsal side, dark brown areas limited to dorsal portion of head and subapical portion of terminal abdominal segment ( Fig. 2 F). Anterior half of pronotum yellowish, remaining thoracic and abdominal segments pale brown with darker posteromedian brown patches (most distinct at pronotum) and darker sublateral areas; abdominal apex yellowish ( Fig. 2 F). Entire ventral side more or less pale. Dorsal tubercles moderately elevated, lateral protuberances distinctly protruding. Head slightly tapering anteriad, widest at posterior 0.3. Abdominal segments moderately elevated at posterior portions, with few indistinct scattered short erected setae; posterolateral protuberances with prominent tubercles and two distinct, long setae; terminal segment IX long, ca. 2.3 times as long as wide; basomedian portion almost glabrous, only with few small tubercles; apex distinctly notched.

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).