Typically, aquatic salamanders still have a very strong body and flat tail which it can use to propel itself through the water. If the animal you are referring to is an axolotl, it only needs to move through the water in order to filter the oxygen from it with its gills and to acquire food. They can swim very much like a fish when they have to move quickly.
If you simply have an animal that only has front legs, but still has gills protruding from its head, then it is a very young salamander and all of the limbs will develop in time.
Cetaceans are large aquatic carnivorous mammals with fin-like forelimbs, and no hind limbs, like: whales, dolphins, porpoises, and narwhals!
The hind limbs are longer than the forelimbs.
Forelimbs
Salamander is a common name of approximately 500 species of amphibians. Uniquely among vertebrates, they are capable of regenerating lost limbs, as well as other body parts. Some salamander species are fully aquatic throughout life, some take to the water intermittently, and some are entirely terrestrial as adults.
bro I have no idea
Depends on the species, but ... 1) hind limbs tend to be sturdier, longer, stronger. 2) the hind limbs are more firmly attached to the spine (via the pelvis) than are the forelimbs.
salamander/newt
It might not be a salamander. It might be a caecilian
Mammals have forelimbs, hind limbs and tails. Even ears can be considered appendages.
a starfish
Their forelimbs are paddle-like flippers that aid in swimming. Also, their necks and limbs are nonretractile.
It includes the pectoral girdle , the pelvic girdle , forelimbs, and the hind limbs.