Megaesthesiinae

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 88

Key to genera of Megaesthesiinae

1. G2 long, exceeding G1 length; basal, distal segments long ( Fig. 82 C, F, M)............................ Megaesthesius

- G2 short, about 2/3 length of G1; basal segment short, distal segment spatuliform with short elongation ( Fig. 83 C)............................................................................................. Alainthesius n. gen.

Figures

FIGURE 82. Gonopods of species of Megaesthesius. A ‒ C, M. sagedae, Singapore: male 2.5 × 3.0 mm (ZRC 1995.885); D ‒ F, M. migmus n. sp., Philippines: holotype male 4.4 × 4.9 mm (NMCR); G ‒ I, M. yokoyai, Japan: male 3.5 × 3.8 mm (after Takeda & Miyake 1969: fig. 4 h, i); J ‒ M, M. westralia, Australia: holotype male 3.4 × 3.8 mm (after Davie 2013: fig. 3 A ‒ D). A, D, G, H, J, K, ventral view of left G 1; B, E, I, K, L, dorsal view of left G 1; C, F, M, left G 2. Scales = 0.1 mm.

FIGURE 83. Gonopods of species of Alainthesius n. gen. A ‒ C, A. signatus n. sp., Madagascar: holotype male 2.5 × 3.3 mm (MNHN-IU- 2013 - 9472) (after Crosnier 1975: fig. 1 f ‒ h); D ‒ H, A. bertrandi n. sp., New Caledonia: holotype male 3.3 × 4.1 mm (MNHN-IU- 2013 - 9073). A, ventral view of right G 1; D, ventral view of left G 1; B, dorsal view of right G 1; E, G, dorsal view of distal part of left G 1; F, ventral view of distal part of left G 1; C, right G 2; H, left G 2. Scales = 0.1 mm.