FIGURES 21–31 in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes

FIGURES 21–31. SEM of Grimaldina brazzai, population from Silvituc, Mexico. 21) Lateral view; 22) Head shield, dorso­anterior view; 23) Ventral margin of valve, anterior side; 24) Ventral margin of valve, posterior side; 25) Distal side of postabdomen with claws, lateral view; 26) Proximal side of postabdomen, lateral view; 27) Detail of marginal spines on proximal side of postabdomen; 28) Postabdominal claws, dorsal view; 29) Tip of A1; 30) A1, antero­vental view; 31) A2, endopod and exopod.