Ancyronyx skalei 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 : 126

Ancyronyx skalei Freitag & Kodada, 2017

( Fig. 2 B)

Material examined. 3LL ( NMW, CKB, CFM [FR126]): “ INDONESIA: Sulawesi, T. Toraja , Salu Toriu River , 810m asl., c. 02°56′38′′ S 119°52′24′′E 0 2 Jan.1998 leg. Freitag (Sul 8 Af)”.

Differential diagnosis (based on presumably fifth instar, HW: 0.32 mm).

Very similar to the previous species, except for the following: anterior quarter of pronotum and posterior quarter of terminal abdominal segment yellowish to pale brown ( Fig. 2 B); lateral portions of the head, entire first abdominal segment and posterior half/entire eight abdominal segment pale; small transverse pale spots might also be present at medioposterior margin of pro-, meso-, and metanotum. Dorsal tubercles slightly elevated. Head more tapering anteriad, widest at posterior 0.2; antennae rather small, approximately reaching anterior margin of labrum. Abdominal segment IX moderately long, ca. 1.9 times as long as wide; basomedian portion slightly tuberculate; apex distinctly 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).