การสำรวจและการศึกษาคาริโอไทป์ของคางคกสกุล Bufo ในประเทศไทย / พรณรงค์ สิริปิยะสิงห์ = Exploration and karyotypic study of toad genus Bufo in Thailand / Pornarong Siripiyasing
The amphibians are grouping in to the phylum of Chordata, division Amphibians. It can be divided in to three orders; Gymnophiona such as caecilians; Caudata such as salamander and Anura such as frog, treefrog and toad. From observation studies of order Bufo in Thailand have been revealed that the genus Bufo can be divided in 4 types; Bufo melanostictus Schneider, Bufo asper Garvenhost, Bufo macrotis Boulenger and Bufo parvus Boulenger. In this studied were observation and karyotyping of order in each part of Thailand. The observation showed that all 4 types of Bufo have the same chromosome number (2n = 22) and very closely in shape and sized especially metacentric and submetacentric chromosome. The karyotypic formula of all 4 Bufo can be summarized as following; Bufo melanostictus Schneider: 2n = 22 ; ; Lm 10 + Sm8 + Ssm4 Bufo asper Garvenhost er: 2n = 22 ; Lm8 + Lsm2 + Sm8 + Ssm4, Bufo macrotis Boulenger: 2n = 22 ; Lm10 + Mm2 + Sm8 + Ssm2, Bufo parvus Boulenger: 2n = 22 ; Lm8 + Lsm2 + Mm2 + Ssm8 + Ssm2. In the past, the chromosome study of Bufo have been reported just only 2 types the one was Bufo melanostictus Schneider: 2n = 22 ; Lm8 + Lsm2 + Mm2 + Sm8 + Ssm2 which difference from this study and the other was the Bufo parvus Boulenge (2n = 22) but, not yet reported in karyotypic formula. Therefore, the rest 2 types of this study were first reported.
