Micronectidae

Key to genera and species of Micronectidae View in CoL 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 View FIGURES3–8 ); antennae fused with head capsule ( Fig. 3B View FIGURES3–8 ); mesosternum with distinct carina ( Fig. 3C View FIGURES3–8 ); metaxyphus very long ( Fig. 3C View FIGURES3–8 )..................................................................................................... Synaptogobia heissi Nieser & Chen, 2006 View in CoL

1b. Head, in frontal view, gradually narrowed towards labium ventrally of eyes ( Fig. 4A View FIGURES3–8 ); antennae free, triarticulate ( Fig. 4B View FIGURES3–8 ); mesosternum without carina ( Fig. 4C View FIGURES3–8 ); metaxyphus short ( Fig. 4D View FIGURES3–8 ) ( Tenagobia Bergroth, 1899 View in CoL )...................... 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 View FIGURES3–8 )........................................................... Tenagobia (Fuscagobia) selecta ( White, 1879) View in CoL

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 View FIGURES3–8 ); meso and hindlegs yellowish, with distinct brown bands and blotches; metatrochanter knobby ( Fig. 6B View FIGURES3–8 ) ( Tenagobia (Romanogobia) Nieser, 1977 View in CoL )...................... 4

3b. Ocular index 0.7–1.6; profemur with 3–9 spines in ventral row ( Figs. 7A, 8A View FIGURES3–8 ); meso and hindlegs unicoloured; metatrochanter not knobby ( Fig. 4E View FIGURES3–8 ).................................................................................. 5

4a (3a) Left paramere without apical projections ( Fig. 6C View FIGURES3–8 )................ Tenagobia (Romanogobia) pseudoromani Nieser, 1975 View in CoL

4b. Left paramere with short apical projections ( Fig. 6D View FIGURES3–8 )................ Tenagobia (Romanogobia) romani Lundblad, 1929 View in CoL

5a (3b) Body longer than 3.0 mm, castaneous; male profemur without ventral papilla and peg ( Fig. 7A View FIGURES3–8 ); 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 View FIGURES3–8 )........................................................... Tenagobia (Schadeogobia) schadei Lundblad, 1929 View in CoL

5b. Body at most 3.0 mm long, light greyish-brown; male profemur with a ventral papilla bearing a small peg ( Fig. 8A View FIGURES3–8 ); 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 View FIGURES3–8 ) ( Tenagobia (Incertagobia) Nieser, 1977 View in CoL )............................................ 6

6a (5b). Receptaculum seminis dumb-bell shaped ( Fig. 8C View FIGURES3–8 ); left paramere apically broadly expanded, with pronounced toe ( Figs. 8D–F View FIGURES3–8 )........................................................ Tenagobia (Incertagobia) sociali s ( White, 1879)

6b. Receptaculum seminis broad ( Fig. 8G View FIGURES3–8 ); left paramere with a short dorsal expansion, apicoventral edge not or hardly produced ( Figs. 8H–L View FIGURES3–8 )................................................. Tenagobia (Incertagobia) incerta Lundblad, 1929 View in CoL