Myaptex, Hull, 1962

Updated key to Myaptex View in CoL group of genera

(only last couplets (8–10) modified from Soares et al. (2025)

8 Mystax composed of few sparse macrosetae mostly restricted to lower facial margin (fig. 16C–D in Soares et al. (2025)); at least one pair of well-developed anterior dorsocentral macrosetae (fig. 16A, D in Soares et al. (2025)); vein R 4 ending at wing apex (fig. 393 in Papavero et al. (2009)); phallus ending in one prong; three coiled spermathecae (figs 398, 402 in Papavero et al. (2009)) ( Chile)................................................................ Rhadinosoma Artigas, 1970

- Mystax composed of abundant and dense macrosetae not restricted to lower facial margin ( Fig. 1C, D View FIGURE 1 ; fig. 1 in Vieira et al. (2014); fig. 17C–E in Soares et al. (2025)); anterior dorsocentral macrosetae absent ( Fig. 1A View FIGURE 1 ; fig. 1 in Vieira et al. (2014); fig. 17A in Soares et al. (2025)); vein R 4 ending before wing apex ( Fig. 1E View FIGURE 1 ; fig. 19 in Vieira et al. (2014); fig. 17B in Soares et al. (2025)); phallus ending in two or three prongs; two or three oval spermathecae (figs 410, 413, 422 in Papavero et al. (2009); fig. 28 in Vieira et al. (2014))............................................................................ 9

9 Frons with parallel edges dorsally in anterior view (fig. 17D, E in Soares et al. (2025)); fore and mid femora with uniform white long macrosetae and setae (fig. 17A in Soares et al. (2025)); phallus with two prongs and female with two oval spermathecae (figs 410, 413 in Papavero et al. (2009)) ( Mexico).................................... Scarbroughia Papavero, 2009

- Frons with convergent edges dorsally in anterior view ( Fig. 1C View FIGURE 1 ); fore and mid femora without uniform white long macrosetae and setae ( Fig. 1A View FIGURE 1 ); phallus with three prongs ( Fig. 1G, H View FIGURE 1 ) and female with three oval spermathecae ( Fig. 3F View FIGURE 3 ; figs 6, 28 in Vieira et al. (2014))........................................................................................ 10

10 Postpedicel lanceolate ( Fig. 1C, D View FIGURE 1 ); posterior margin of sternite 8 simple and straight, without projections ( Figs 2J View FIGURE 2 , 5I View FIGURE 5 , 7I View FIGURE 7 ); epandrium wide in lateral view ( Fig. 2B, D View FIGURE 2 ); gonocoxite mostly subtriangular in lateral view ( Figs 2F View FIGURE 2 , 11F View FIGURE 11 , 14F View FIGURE 14 ); gonostylus more or less straight with base hidden behind gonocoxite in lateral view ( Figs 2E, K View FIGURE 2 , 5E View FIGURE 5 , 11E, J View FIGURE 11 ); phallus unconcealed, ending in three long prongs ( Fig. 2G View FIGURE 2 ); female tergite 8 only 1.5 times length of tergite 7 ( Fig. 3B, C, E View FIGURE 3 ); female sternite 8 with setae basally ( Fig. 3B, D, E View FIGURE 3 ) ( Trinidad and Tobago, Venezuela and Brazil).............................. Merucata gen. nov.

- Postpedicel oval (figs 1, 17, 26, 29 in Vieira et al. (2014)); posterior margin of sternite 8 with projections or strongly bulged and pronounced at posterior margin (figs 24, 36 in Vieira et al. (2014)); epandrium more or less elongate and subrectangular in lateral view (figs 3, 20, 32 in Vieira et al. (2014)); gonocoxite more or less slender, tapering towards a rod-like rounded apex; gonostylus arched and visible from its base in lateral view (figs 4, 25, 34 in Vieira et al. (2014)); phallus concealed ending in three short prongs (figs 6, 23, 35 in Vieira et al. (2014)); female tergite 8 more than 2 times length of tergite 7; female sternite 8 bare (figs 26, 28 in Vieira et al. (2014)); ( Mexico and Costa Rica).......................... Martintella Artigas, 1996