Austrolimnius Carter & Zack

Arce-Pérez, Roberto & Reynoso-Velasco, Daniel, 2025, A new species of Austrolimnius Carter & Zeck from east-central Mexico and new state records for species of the genus in the country (Coleoptera: Elmidae), Zootaxa 5633 (3), pp. 541-552 : 551-552

Key to the species in the genus Austrolimnius Carter & Zack from Mexico and Central America.

1 – Pronotum with a medial longitudinal sulcus ( Fig. 1A ) ( Telmatelmis )............................................. 2

1' – Pronotum smooth, without a medial longitudinal sulcus................................... A. (Helonoma) eris Hinton

2 – Elytron with a carina at base of third interval ( Figs. 1A, 1C )................................................... 3

2' – Elytron without a carina at base of third interval.............................................. A. formosus (Sharp)

3 – Pronotum with median sulcus about 3/4 as wide at apex as at base; males with tuff of golden setae on prosternum, behind base of prosternal process, and tuff on side of metasternal disk, behind middle coxa....................... A. halffteri Hinton

3' – Pronotum with median sulcus almost as wide at apex as at base ( Fig 1A ) or almost twice as wide at apex as at base; males without tuffs of setae on prosternum and on side of metasternal disk (e.g., Fig. 1B )................................. 4

4 – Pronotum with median sulcus almost twice as wide at apex as at base; elytron with long carina at base of third interval, reaching almost 1/4 of elytron length............................................................... A. curtulus (Sharp)

4' – Pronotum with sulcus almost as wide at apex as at base ( Fig. 1A ); elytron with short carina at base of third interval, reaching only 1/8–1/10 of elytron length (e.g., Figs. 1A, 1C ).......................................................... 5

5 – Male hind trochanter with row of teeth on posterior margin; hind tibiae with preapical denticle on internal margin and without oval concavity on dorsal margin.......................................................... A. sulcicollis (Sharp)

5' – Male hind trochanter without row of teeth on posterior margin ( Fig. 1A ); hind tibiae without preapical denticle on internal margin and with oval concavity on dorsal margin ( Fig. 1A , encircled detail)....... A. hintoni Arce-Pérez & Reynoso sp. nov.

Figures

FIGURE 1. Structures of male of Austrolimnius (Telmatelmis) hintoni Arce-Pérez & Reynoso sp. nov. (central inset shows electron micrograph of head in frontal view). (A) dorsal habitus (yellow arrow indicates short carina, white arrows indicate sublateral carinae, black arrow indicates fringe of long setae, electron micrographs show details on hind leg), (B) ventral habitus, (C) lateral habitus (yellow arrow indicates short carina, white arrows indicate sublateral carinae, encircled detail shows comb row of spine-like setae). tr = trochanter. Scale bar = 0.5 mm and applies only to A (not electron micrograph) and B.