Motonerus

Ek, Martin Fiká Č & Short, Andrew Edward Z., 2006, A revision of the Neotropical genus Motonerus Hansen (Coleoptera: Hydrophilidae: Sphaeridiinae), Zootaxa 1268, pp. 1-38 : 35

Motonerus sp. A

( Figs. 31 , 40 , 51 )

Material Examined. BOLIVIA: “ BOLIVIA: La Paz, Coroico / Cerro Uchumachi, 2550 m / 16°12.71'S 67°42.82'W / 26.1.2001, R. Anderson / cloud forest litter, 2001­012F”, 3ΨΨ ( CNMC).

Differential Diagnosis. Body larger (length: 2.0 mm); general coloration brown; elytra evenly but not very highly convex, strongly lowered posteriorly in lateral view; elytral intervals evenly elevate throughout; denticulation of lateral margins of elytra very fine, slightly denser on elytral base, reaching elytral apex; anteromedian prosternal excision shallow and wide; preepisternum very narrow, nearly lamellar; metaventrite without median depression; abdominal ventrite 1 with submedian longitudinal ridges.

Easily distinguishable from all Motonerus species with narrow preepisternal elevation of mesothorax lacking median concave area by evenly convex and posteriorly strongly lowered elytra in lateral view, submedian longitudinal ridges present only on abdominal ventrite 1, and elytral margins with fine denticulation nearly reaching elytral apex.

Figures

FIGURES 21 – 31. Lateral habitus of Motonerus. 21: M. apterus sp. n.; 22: M. oosternoides sp. n.; 23: M. depressus sp. n.; 24: M. nublado sp. n.; 25: M. andersoni sp. n.; 26: M. hanseni sp. n.; 27: M. problematicus sp. n.; 28: M. obscurus Hansen (El Salvador); 29: M. obscurus Hansen (Oaxaca prov., Mexico); 30: M. sp. B; 31: M. sp. A. Scale bar = 1 mm.

FIGURES 32 – 40. Preepisternal elevation of mesothorax and median part of metaventrite of Motonerus. 32: M. apterus sp. n.; 33: M. oosternoides sp. n.; 34: M. depressus sp. n.; 35: M. andersoni sp. n.; 36: M. hanseni sp. n.; 37: M. nublado sp. n.; 38: M. obscurus Hansen; 39: M. problematicus sp. n.; 40: M. sp. A. Scale bar = 0.2 mm.

FIGURES 41 – 53. Details of of Motonerus. 41, 49: M. sp. B; 42, 52: M. andersoni sp. n.; 43, 53: M. apterus sp. n.; 44: M. depressus sp. n.; 45: M. hanseni sp. n.; 46: M. oosternoides sp. n.; 47: M. nublado sp. n.; 48: M. obscurus Hansen; 50: M. problematicus sp. n.; 51: M. sp. A. 41 — preepisternal elevation of mesothorax and median part of metaventrite (scale bar = 0.2 mm); 42 – 51 — median part of prosternum; 52 – 53 — sternite 9 of male.