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GEOGRAPHICAL DISTRIBUTION:
Ambystoma is found in North America from Southern Alaska to Mexico. Neotenic forms occur in mountain regions, especially in Mexico.
CHARACTERS:
i) Ambystoma Tigrinum is commonly known as tiger-sala-mander.
ii) Body is an elongated lizard – about 12 cm in length.
iii) The colour of the body is black with yellow patches.
iv) Skin is poisonous.
v) Limbs are well developed. Fore limbs bear 4 fingers and hind limbs have 5 toes.
vi) Tail fin and external gills are absent in the adult stage.
vii) Vertebrates are amphicoelous.
viii) Sexes are separate fertilization is internal
ECONOMIC IMPORTANCE:
– It is used for embryological study.
