Cymo

Brösing, Andreas, Al-Aidaroos, Ali M. & Türkay, Michael, 2014, The Red Sea species of Cymo de Haan, 1833 (Decapoda, Brachyura, Xanthidae), associates of scleractinian corals, Zootaxa 3779 (2), pp. 195-214 : 212

Key to Red Sea species of Cymo

1. Frontal margin lined with coarse, blunt granules of irregular sizes; dorsal surface of carapace, cheliped carpus and palm with similarly shaped granules usually in clusters; front appears quadrilobed ( Fig.14 D)..................... C. quadrilobatus

- Frontal margin and chelipeds with pointed spines, front bilobed................................................. 2

2. Carapace of nearly circular shape, frontal margin with bifurcated spines, fingers of cheliped of white or black colour...... 3

- Carapace slightly longer than wide, frontal margin with relatively longer frontal spines than in the other three species ( Fig. 14 B); fingers of chelipeds of gray or pale colour.................................................. C. deplanatus

3. Frontal margin with two bifurcated spines on each lobe ( Fig. 14 A), entire chelipeds..................... C. andreossyi

- Frontal margin with one bifurcated spine on each lobe ( Fig.14 C), fingers of larger cheliped black but distally white, black col- ouration on pollex extending onto male palm................................................. C. melanodactylus

Figures

FIGURE 14. Views of antero-dorsal margin of carapace. A, Cymo andreossyi (Yemen, SMF 41727); B, C. deplanatus (South China Sea, ZMG 1216); C, C. melanodactylus (Indian Archipelago, ZMG 1218); D, C. quadrilobatus (Red Sea, SMF 41752). Scale bars: A, C, D = 300 µm; B, 200 µm.