Key to Metadynomene species

1a. Anterolateral margin unarmed, without teeth; with low lobe behind end of branchial groove, at junction between antero- and posterolateral margins .................. Metadynomene devaneyi (Takeda, 1977) [Hawaii, French Polynesia]

1b. Anterolateral carapace margin with 3 or 4 teeth........................................................................................................... 2

2a. Anterolateral margin with 4 small subacute spine-like teeth; small tubercle behind end of branchial groove, at junction between antero- and posterolateral margins; suborbital margin not prominently projecting anteriorly, barely visible from dorsal view ................................................................. Metadynomene crosnieri McLay, 1999 [Seychelles]

2b. Anterolateral margin with 3 distinct teeth; distinct tooth behind end of branchial groove, at junction between antero- and posterolateral margins; suborbital margin projecting anteriorly, clearly visible from dorsal view ....................... 3

3a. Carapace ovoid; third anterolateral tooth small; lobes on the outer margin of the carpus of the cheliped prominent; P2-P4 relatively stouter, lateral cristae of merus and carpus well developed................................................................. ................................................................................................... Metadynomene tuamotu sp. nov. [French Polynesia]

3b. Carapace quadrate; third anterolateral tooth large; lobes on the outer margin of the carpus of the cheliped low; P2-P4 relatively more slender, lateral cristae of merus and carpus low .................................................................................... .......................................................................................... Metadynomene tanensis (Yokoya, 1933) [western Pacific]