Eurynome Leach, 1814

Forges, Bertrand Richer De, Lee, Bee Yan & Ng, Peter K. L., 2021, The taxonomy of spider crabs of the genera Eurynome, Choniognathus, Seiitaiodes and Kasagia (Crustacea: Brachyura: Majidae) from southwest Indian Ocean, Zootaxa 5048 (3), pp. 301-333 : 302

Key to genera allied to Eurynome Leach, 1814

1 Carapace longitudinally ovate; pseudorostral spines short; dorsal carapace surface covered with spines, granules or simple tubercles, never boletiform or forming plates............................................................... 2

- Carapace distinctly pyriform; pseudorostral spines long; carapace covered with spines or simple tubercles, some of which are boletiform, sometimes forming large plates on gastric, cardiac and branchial regions............................... 4

2 Hepatic lobe with 2 or 3 distinct spines; lateral branchial margin with 3 or 4 distinct spines.................... Majella

- Hepatic lobe with lobiform process or tubercles, never spines; lateral branchial margin with rounded granules or short spines ................................................................................................... 3

3 Pseudorostral spines short; hepatic region with low tubercles and granules; lateral margin with tubercles and granules; ischium and merus of third maxilliped may be fused; adult male cheliped short or medium-length; G1 straight, slender................................................................................................... Choniognathus

- Pseudorostral spines distinctly elongate; hepatic region with auriculiform lobe; lateral margin with short spines, some of which may be boletiform; ischium and merus of third maxilliped always free; adult male cheliped very long; G1 sinuous, relatively stout......................................................................................... Kasagia

4 Carapace with small plates on gastric, cardiac and branchial regions; hepatic region with large auriculiform lobe; anterior margin of sternopleonal cavity with large plate on each side; G1 with a subterminal projection, hook-like....... Eurynome

- Carapace with large plates on gastric, cardiac and branchial regions; hepatic region with sharp tooth and low boletiform tubercle; auriculiform lobe; anterior margin of male sternopleonal cavity with spines on each side; G1 slender, straight or sinuous............................................................................................... Seiitaoides