Abstract
Sixteen species of freshwater crabs from Thailand were identified and rearranged in their classification discriminating mostly on the structures of the first gonopod by Bott ( 1970). Freshwater crabs had been studied earlier by Rathbun (1904-1906 ). Alcock (1909,1910) and others. Kemp ( 1923 ) reported only 5 species of river crabs found in Thailand. Recently, Bott (1970) rearranged the classification of freshwater crabs using the structures of the first gonopod as the discriminating taxa and reported 14 species from Thailand in his publication. Observation of freshwater crabs in the collection of the Museum of Fisheries. Kasetsart University. Bangkok, Thailand revealed that the changing from Ranguna ( Ranguna ) siamensis. ( BOTT, 1970 ) to Ranguna ( Demanietta ) siamensis is taxonom-ically logical. A new subspecies of Ranguna {Demanietta) tenasserimensis from Thailand was also described. The sixteen species of freshwater crabs belonging to two families (Para-thelphusidae and Potamidae) were studied and described. Carapace width : carapace length : carapace thickness : front width were measured in mm. All gonopods were from the right hand side and in order to avoid confusion, the following terms were used in this paper for the first gonopod: ( 1 ) Basal = proximal, (2) Channel = a longitudinal groove formed laterally on the distal and predistal segments, (3 ) Distal segment = the last segment at the distal end, (4) Dorsal portion = the surface area on the distal segment inwhich in contact with the sternum of the crab. Smalley (1964) named it as 'cephalic surface". ( 5 ) Predistal segment = the segment between distal segment and basio-podite or the last but one segment at the distal end, and (6 ) Ventral portion = the surface area on the distal segment which could be seen directly when the abdomen was opened. Smalley (1964) named it the 'caudal surface'.
บทคัดย่อSixteen species of freshwater crabs from Thailand were identified and rearranged in their classification discriminating mostly on the structures of the first gonopod by Bott ( 1970). Freshwater crabs had been studied earlier by Rathbun (1904-1906 ). Alcock (1909,1910) and others. Kemp ( 1923 ) reported only 5 species of river crabs found in Thailand. Recently, Bott (1970) rearranged the classification of freshwater crabs using the structures of the first gonopod as the discriminating taxa and reported 14 species from Thailand in his publication. Observation of freshwater crabs in the collection of the Museum of Fisheries. Kasetsart University. Bangkok, Thailand revealed that the changing from Ranguna ( Ranguna ) siamensis. ( BOTT, 1970 ) to Ranguna ( Demanietta ) siamensis is taxonom-ically logical. A new subspecies of Ranguna {Demanietta) tenasserimensis from Thailand was also described. The sixteen species of freshwater crabs belonging to two families (Para-thelphusidae and Potamidae) were studied and described. Carapace width : carapace length : carapace thickness : front width were measured in mm. All gonopods were from the right hand side and in order to avoid confusion, the following terms were used in this paper for the first gonopod: ( 1 ) Basal = proximal, (2) Channel = a longitudinal groove formed laterally on the distal and predistal segments, (3 ) Distal segment = the last segment at the distal end, (4) Dorsal portion = the surface area on the distal segment inwhich in contact with the sternum of the crab. Smalley (1964) named it as 'cephalic surface". ( 5 ) Predistal segment = the segment between distal segment and basio-podite or the last but one segment at the distal end, and (6 ) Ventral portion = the surface area on the distal segment which could be seen directly when the abdomen was opened. Smalley (1964) named it the 'caudal surface'.
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