Eremocosta Roewer 1934

Key to the species of Eremocosta

1 Fondal notch (male) deep and distinct (Figs. 2I, K, S)....................................................... 2

- Fondal notch short and/or indistinct (Figs. 2A, E, O, W)...................................................... 4

2 VDC (male) proximal on ventral edge of fixed finger (Figs. 1C, 2I, J)................................. E. formidabilis

- VDC distal on ventral edge of fixed finger................................................................. 3

3 Male fixed finger dagger-like (Fig. 2K) with distinct MM and distinct tooth-like MD (Fig. 2K, arrow). Female genital operculum as in Fig. 4C with wings tear-drop shaped......................................................... E. gigas

- Fixed finger not dagger-like, MM lacking or greatly reduced and MD present as a ridge (Fig. 2S, arrow). Female genital operculum with straight, parallel, narrow anterior arms broadening into distinct, rounded club-shaped wings, shaped like hockey sticks (Fig. 4E)................................................................................ E. striata

4 Male movable finger with quadrate MD (Fig. 2O, arrow), female genital operculum as in Fig. 4D with recurved anterior arms and recurved posterior margins................................................................. E. gigasella

- Movable finger with no MD, female genital operculum not as above............................................. 5

5 Male fixed finger usually as long as or slightly longer than movable finger. Movable finger usually with two small MSM (sometimes only one) (Fig. 2W). Lower edge of VDC, when viewed from ectal side of chelicera, slightly concave (Fig. 2W). Female genital operculum with long straight anterior arms; posterior wings quadrate as in Fig. 4F. .............. E. titania

- Fixed finger usually slightly shorter than movable finger. Movable finger usually with just one small MSM (Figs. 2A, 2E). Lower edge of VDC, when viewed from ectal side of chelicera, slightly convex (Figs. 2A, 2E). Female genital operculum as in Figs. 4A or B........................................................................................ 6

6 Male movable finger with small but distinct MM (Fig. 2E). Female genital operculum club-shaped with long anterior arms and a posterior knob, posterior wing ovate as in Fig. 4B............................................... E. calexicensis

- Movable finger with barely visible MM (sometimes a tiny ridge) (Fig. 2A). Wings of genital operculum thin and curved as in Fig. 4A..................................................................................... E. bajaensis