Notionotus

Jia, Fenglong & Short, Andrew Edward Z., 2011, Notionotus attenuatus sp. n. from southern China with a key to the Old World species of the genus (Coleoptera: Hydrophilidae), Zootaxa 2830, pp. 55-58 : 57-58

Key to the Old World species of Notionotus

Modified from Hebauer (2001).

1 Elytra without sutural stria. Antennae 8-segmented..................................................................................................... 2

- Elytra with sutural stria. Antennae 9-segmented ......................................................................................... N. suturalis

2 Ground punctation on the elytra distinct....................................................................................................................... 4

- Ground punctation on the elytra absent or appearing absent, giving the elytra an entirely smooth appearance.......... 3

3 Slightly larger species (1.8–2.0 mm). Dorsum uniformly medium to light yellow in color ...................... N. ochreatus

- Slightly smaller species (1.6–1.8 mm). Elytral disc dark, brown to dark brown, with two light yellow patches mediobasally; elytral margins pale ( Fig. 1 A) ............................................................................................ N. fenestratus

4 Pronotum yellow or pale in color with central third distinctly darkened (e.g. Fig. 1 D, E). Elytra with broadly pale

margins posteriorly ....................................................................................................................................................... 5 - Pronotum generally unicolorous, at most with slightly paler margins; discal region never differentially colored. Elytra without or with only narrow pale margins ......................................................................................................... 6 5 Size smaller (<2.0 mm). Dorsal ground punctation not detectable on pronotum and very faint on elytra. ................... .......................................................................................................................................................... N. attenuatus sp.n.

- Size larger (>2.0 mm). Dorsal ground punctation faint but detectable on pronotum, and very distinct on elytra ......... ............................................................................................................................................................... N. notaticollis .

6 Dorsal color dark brown, with narrow pale margins. Elytral ground punctation present but faint; not subseriate........ .................................................................................................................................................................... N. mazzoldii

- Dorsal color yellow to light brown, without distinctly pale margins. Elytral ground punctation distinct, subseriate ... ......................................................................................................................................................................... N. siklisi .

Figures

FIGURE 1. Habitus photographs of Old World Notionotus spp. A) N. fenestratus (specimen from China; SEMC); B) N. mazzoldii (paratype from Taiwan; SEMC); C) N. siklisi (specimen from Nepal; SEMC); D) N. attenuatus (paratype; SEMC); E) N. notaticollis (paratype from Laos; SEMC). Scale bar = 0.5 mm.