Axolotl: Cool Cute Aquarium Mexican Salamander

Axolotl: Cool Cute Aquarium Mexican Salamander

Axolotl also known as Mexican salamander
or Mexican walking fish, is a neotenic salamander,
closely related to the tiger salamander.
Although the axolotl is colloquially known as
a "walking fish", it is not a fish, but an amphibian.
The species originates from numerous lakes,
such as Lake Xochimilcounderlying Mexico City.
Axolotls are unusual among amphibians in that they
reach adulthood without undergoing metamorphosis.
Instead of developing lungs and taking to land,
the adults remain aquatic and gilled.

A sexually mature adult axolotl,
at age 18–24 months, ranges in length from 15–45 cm,
although a size close to 23 cm is most common and
greater than 30 cm is rare.

Their heads are wide, and their eyes are lidless.
Their limbs are underdeveloped and possess long,
thin digits. Males are identified by their swollen cloacae
lined with papillae, while females are noticeable for
their wider bodies full of eggs.
Three pairs of external gill stalks originate behind their
heads and are used to move oxygenated water.
The external gill rami are lined with filaments to
increase surface area for gas exchange.
Four gill slits lined with gill rakers are hidden
underneath the external gills.

Axolotls have barely visible vestigial teeth,
which would have developed during metamorphosis.
The primary method of feeding is by suction,
during which their rakers interlock to close the gill slits.
External gills are used for respiration,
although buccal pumping may also be used to provide
oxygen to their lungs. Axolotls have four different colours,
including two mutant colors. The two normal
colors are "wildtype" and melanoid.
The two mutant colors are leucistic (pale pink with black eyes)
and albino (golden, tan or pale pink with pink eyes).

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