Ancyronyx tobada 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 tobada Freitag & Kodada, 2017

( Figs 2 C; 4A, C, E)

Material examined. 3LL ( CKB, CFM [FR114]): “ 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)”; 6LL ( CKB [SEM], NMW, CFM [FR 119]): “ INDONESIA: C Sulawesi, Rd. Tentena-Pendola, 9km E Tentena , secondary forest; submerged wood, c. 860m asl ., c. 01°46′31′′ S 120°43′05′′ E 0 3 Jan.1998 leg. Freitag (Sul 10f)”; 4LL ( CFM [FR121]): “ INDONESIA: S Sulawesi, Rd. Km 56 Tentena-Gintu ; black-water river; submerged wood, c. 1190m asl ., c. 01°49′28′′ S 120°21′43′′E 0 4 Jan.1998 leg. Freitag (Sul16f)”.

Differential diagnosis (based on presumably sixth instar, HW: 0.32 mm). Generally similar to Ancyronyx schoedli except for the following characters: pronotum yellowish in anterior third, yellowish lateral portions of head extending posteriad along the frontal suture; posterior margins of thoracic and abdominal terga slightly paler, somewhat dark yellow-brown; terminal abdominal segment dark along anterior 0.1, yellow-brown along anterior 0.1–0.6, dark brown along posterior 0.6–0.9 and pale yellow-brown at the tip. Entire ventral side pale yellowish, only abdominal segment IX occasionally slightly darker, but still somewhat pale. Dorsal tubercles moderately elevated ( Figs 4 A, C). Head ( Figs 2 C, 4A) slightly tapering anteriad, widest at posterior 0.2; antennae overreaching anterior margin of labrum. Abdominal segments gently elevated near entire posterior portion; dorsum with scattered short setae ( Figs 4 C, E); lateral protuberances with tubercles almost as large as spiracles; segment IX ( Figs 2 C, 4E) very long, ca. 2.4 times as long as wide; basomedian portion glabrous, without tubercles; apex deeply 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.