Micronectidae

Key to genera and species of Micronectidae from Pará (adapted from Nieser 1977; Nieser & Melo 1997; Nieser & Chen 2006) 1a. Head, in frontal view, abruptly narrowed towards labium ventrally of eyes (Fig. 3A); antennae fused with head capsule (Fig. 3B); mesosternum with distinct carina (Fig. 3C); metaxyphus very long (Fig. 3C)..................................................................................................... Synaptogobia heissi Nieser & Chen, 2006 1b. Head, in frontal view, gradually narrowed towards labium ventrally of eyes (Fig. 4A); antennae free, triarticulate (Fig. 4B); mesosternum without carina (Fig. 4C); metaxyphus short (Fig. 4D) (Tenagobia Bergroth, 1899)...................... 2 2a (1b). Body longer than 4.0 mm; left side of male abdominal tergum VIII with a long finger-like projection at apex of dorsal lobe (Fig. 5A)........................................................... Tenagobia (Fuscagobia) selecta (White, 1879) 2b. Body shorter than 4.0 mm; male without long finger-like projection at dorsal lobe of abdominal tergum VIII............ 3 3a (2b). Ocular index 0.5–0.8; male profemur with 2 spines in ventral row (Fig. 6A); meso and hindlegs yellowish, with distinct brown bands and blotches; metatrochanter knobby (Fig. 6B) (Tenagobia (Romanogobia) Nieser, 1977)...................... 4 3b. Ocular index 0.7–1.6; profemur with 3–9 spines in ventral row (Figs. 7A, 8A); meso and hindlegs unicoloured; metatrochanter not knobby (Fig. 4E).................................................................................. 5 4a (3a) Left paramere without apical projections (Fig. 6C)................ Tenagobia (Romanogobia) pseudoromani Nieser, 1975 4b. Left paramere with short apical projections (Fig. 6D)................ Tenagobia (Romanogobia) romani Lundblad, 1929 5a (3b) Body longer than 3.0 mm, castaneous; male profemur without ventral papilla and peg (Fig. 7A); ratio length of pruinose area of embolium: length of hemelytra 0.4–0.6; margins of male abdominal segment VIII with 2 spines and 2 long bristles (Fig. 7B)........................................................... Tenagobia (Schadeogobia) schadei Lundblad, 1929 5b. Body at most 3.0 mm long, light greyish-brown; male profemur with a ventral papilla bearing a small peg (Fig. 8A); ratio length of pruinose area of embolium: length of hemelytron 0.2–0.3; margins of male abdominal segment VIII with 4 spines: 3 long and one normal bristle (Fig. 8B) (Tenagobia (Incertagobia) Nieser, 1977)............................................ 6 6a (5b). Receptaculum seminis dumb-bell shaped (Fig. 8C); left paramere apically broadly expanded, with pronounced toe (Figs. 8D–F)........................................................ Tenagobia (Incertagobia) sociali s (White, 1879) 6b. Receptaculum seminis broad (Fig. 8G); left paramere with a short dorsal expansion, apicoventral edge not or hardly produced (Figs. 8H–L)................................................. Tenagobia (Incertagobia) incerta Lundblad, 1929