Canthysellus

Baca, Stephen M. & Toledo, Mario, 2015, CanthysellusBaca and Toledo (Coleoptera: Noteridae: Noterini), a New Genus of Burrowing Water Beetle from South America, The Coleopterists Bulletin 69 (3), pp. 477-488 : 487

KEY TO THE SPECIES OF CANTHYSELLUS

1. Metatibia and metatarsomere I with inner margin as in Fig. 7 , densely setose; setae slender, hair-like; aedeagus as in Fig. 11a–e . ............................. C. peruanus , new species

1′. Metatibia and metatarsomere I with inner margin as in Fig. 6 , with single line of ca. 8–10 evenly spaced, stiff setae..............2

2. Size smaller, 2.40–2.95 mm from elytral apices to anterior margin of pronotum; base of head usually only weakly infuscate ( Fig. 1 ); Aedeagus as in Fig. 8a–e , left lateral lobe broad with setae extending well beyond lobe margin ( Fig. 8d ); median lobe with apex pointed, but not elongate in lateral aspect ( Fig. 8a, c ).......... C. buqueti ( Laporte, 1835)

2′. Size larger, 2.95 mm – 3.30 mm from elytral apices to anterior margin of the pronotum; base of head usually strongly infuscate, nearly black ( Fig. 2 ); Aedeagus as in Fig. 9a–e , left lateral lobe very broad with setae extending just to or only slightly past lobe margin ( Fig. 9d ); median lobe with apex elongate in lateral aspect ( Fig. 9a, c ). ............. C. sipaliwini , new species

Figures

Figs. 6–7. Canthysellus species,hind legs.6) C.buqueti, male, a = setae of inner margin of metatibia, b = posterior metatibial spur, serration is diagnostic of the genus; 7) C. peruanus, paratype, male, a = setae of inner margin of metatibia. Scale bars = 0.25 mm

Fig. 11. Canthysellus buqueti, female genitalia. Scale bar = 0.25 mm.

Figs. 1–3. Canthysellus species, dorsal and lateral habitus. 1) C. buqueti, male; 2) C. sipaliwini, holotype, male;

Figs. 8–10. Canthysellus species, aedeagi. 8) C. buqueti, Suriname; 9) C. sipaliwini, holotype, Suriname; 10) C. peruanus, paratype, Peru. a = median lobe, left lateral aspect, b = median lobe, dorsal aspect, c = median lobe, right lateral aspect, d = left lateral lobe, e = right lateral lobe. Scale bars = 0.25 mm.