Gymnanthelius

Perkins, Philip D., 2004, A revision of the Australian endemic water beetle genus Gymnanthelius Perkins (Coleoptera: Hydraenidae), Zootaxa 585, pp. 1-39 : 6-7

Key to Species of Gymnanthelius

1 Elytral discal punctures non­serial ( Fig. 8 ) ................................................................... 2

­ Elytral discal punctures serial ( Fig. 5 ) .......................................................................... 4

2 Elytral punctures entirely random, except one row along explanate margin; elytra weakly tumid over posterior declivity; punctures large and deep ( Fig. 9 )...................... ........................................................................................................ maxipunctus n. sp.

­ Elytra punctures random on disc, becoming serially arranged over posterior declivity; elytra not tumid over posterior declivity ....................................................................... 3

3 Elytral disc scabrous, surface very uneven between large random punctures; "series" 5 and 6 random; size larger, ca. 2.08 mm long ( Fig. 8 )............................... tunicus n. sp.

­ Elytral disc non­scabrous, punctures smaller and interstices shining; series 5 and 6 serial or subserial; size smaller, ca. 1.75 mm long ( Fig. 7 )..... hieroglyphicus (Deane)

4 Dorsum black or piceus with some faint metallic reflections; reliefs of head, pronotum and elytra shining; metasternum entirely hydrofuge pubesent ( Figs. 1 , 5 ) porchi n. sp.

­ Dorsum brownish with cupreus and/or aureus metallic reflections; pronotal reliefs dull or very weakly shining, microreticulate or effacedly microreticulate; metasternum with or without glabrous area........................................................................................ 5

5 Elytral punctures each with four minute shining granules, two each at anterior and posterior margins; metasternum with small, shining, non­pubescent area basomedially ( Fig. 2 ) ............................................................................................. clypeatus (Deane)

­ Elytral punctures without granules ( Fig. 6 ); metasternum with or without glabrous area ....................................................................................................................................... 6

6 Pronotal median groove widest near base, tapering anteriorly to point; metasternum with glabrous area basomedially ( Fig. 4 ) ................................... lamingtonensis n. sp.

­ Pronotal median groove widest anteriorly ( Fig. 6 ); metasternum entirely hydrofuge pubescent.......................................................................................................................7

7 Head, pronotum and elytra dull, effacedly microreticulate; elytral serial punctures smaller, interval margins not irregular; size smaller, ca. 1.50 mm long ( Fig. 3 ) ........... ............................................................................................................ cupreus (Deane)

­ Head and especially pronotum dull, microreticulate, markedly contrasting with shining elytral reliefs; elytral punctures large, margins of intervals irregular; size larger, ca. 1.95 mm long ( Fig. 6 ) ......................................................................... opacicollis n. sp.

Figures

FIGURE 1. Gymnanthelius porchi holotype. Dorsal structures and sculpture.

FIGURE 2. Gymnanthelius clypeatus holotype. Dorsal and lateral habitus.

FIGURE 3. Gymnanthelius cupreus holotype. Dorsal and lateral habitus.

FIGURE 4. Gymnanthelius lamingtonensis holotype. Dorsal and lateral habitus.

FIGURE 5. Gymnanthelius porchi holotype. Dorsal and lateral habitus.

FIGURE 6. Gymnanthelius opacicollis holotype. Dorsal and lateral habitus.

FIGURE 7. Gymnanthelius hieroglyphicus holotype. Dorsal and lateral habitus.

FIGURE 8. Gymnanthelius tunicus holotype. Dorsal and lateral habitus.

FIGURE 9. Gymnanthelius maxipunctus holotype. Dorsal and lateral habitus.