Abstract
The study of the populations of the mexicanus group has been abandoned for the last 60 years, and there are few records of its species. This study updated the records of the populations of the mexicanus and pilosimanus groups present in the state of Tabasco. The crayfish were collected with otter trawls and traps in the Grijalva and Usumacinta sub-basins throughout an annual cycle, during the seasons of minimum (MII) and maximum (MAI) flooding. The specimens were identified following the conventional taxonomic criteria, and they were measured and sexed as male (MFI), at rest (MFII) and female (H). A total of 386 specimens were collected: 44 specimens of Procambarus (Austrocambarus) acanthophorus Villalobos, 1948; 40 specimens of P. (A.) zapoapensis Villalobos, 1954; 8 P. (A.) veracruzanus Villalobos, 1954; 5 P. (A.) ruthveni Pearse, 1911, and 289 specimens of P. (A.) llamasi Villalobos, 1954. Procambarus (Austrocambarus) llamasi was distributed exclusively in the subregion Ríos, in wetland habitats subject to seasonal flooding, and the other species were found in the subregion Sierra in agricultural and hilly areas. New records and extended distribution ranges of cambarids of the state of Tabasco are presented.
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