Persian brook salamander
species of amphibian

The Persian brook salamander or Persian mountain salamander (Paradactylodon persicus) is an endemic amphibian species of salamander in the family Hynobiidae found in Iran and possibly Azerbaijan.
Description
Adults have 4 fingers and toes, are darkly colored with scattered yellow spots and have rectangular heads and rounded tails oftentimes longer than the rest of their body. Larvae have large rounded triangular heads with short fin-like tails roughly shorter than the rest of their body and are generally light yellow without any distinct spots. The juveniles complexion darkens and develops mottled yellow spots while their head become more rectangular, and their tails become longer and more rounded. Larvae and juveniles sizes are roughly the same ranging from 4-10 cm while the larger adults commonly range from 15-20 cm. The total length of the longest specimen was 26.85cm. Larvae have external gills that suit their solely aquatic habitats while adults replace these with lungs as they mature.
Taxonomy
Phylogenetic analysis has indicated that populations of the former Paradactylodon gorganensis are contained within this species.
Distribution & habitat
The only known populations of this species inhabit the temperate rainforest region along the southwestern tip of the Caspian Sea in Iran. This species is also believed to inhabit parts of Azerbaijan where the temperate rainforest that these salamanders are known to inhabit reaches north however no definitive sightings have been verified.
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