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Print/export Download as PDF; ... is a species of aquatic salamander in the family Proteidae. ... Adults are 6 to 8.5 inches (15 to 22 cm) in length. ...
Necturus occur in surface waters, preferentially with clear water and rocky substrates without silt. N. maculosus live in lakes, rivers, streams, and creeks. [15] [16] They like shallow waters with low temperatures from autumn to early spring. [15] They are most active in cold temperatures, specifically between 9.1 and 20.2 degrees Celsius.
[15] [16] The common mudpuppy never leaves its aquatic environment and therefore does not undergo morphogenesis; however, many salamanders do and develop differentiated teeth. [17] Aquatic salamander teeth are used to hinder escape of the prey from the salamander; they do not have a crushing function. [17] This aids the salamander when feeding.
A sexually mature adult axolotl, at age 18–27 months, ranges in length from 15 to 45 cm (6 to 18 in), although a size close to 23 cm (9 in) is most common and greater than 30 cm (12 in) is rare. Axolotls possess features typical of salamander larvae, including external gills and a caudal fin extending from behind the head to the vent.
Once fully metamorphosed, they leave the water and live a terrestrial life, when they are known as "efts." [12] [13] Only when the eft reaches adulthood will the North American species return to live in water, rarely venturing back onto the land. Conversely, most European species live their adult lives on land and only visit water to breed. [14]
San Marcos River, located in Hays County, Texas, is the only known location of the San Marcos salamander. The population estimate in 1973 was about 20,880 salamanders living in the uppermost reaches of Spring Lake. [8] An estimate in 1993 suggested about 30,451 salamanders across all ranges of Spring Lake and up to 150 metres (490 ft) downstream.
The northern two-lined salamander (Eurycea bislineata) is a species of salamander in the family Plethodontidae found in Canada and the United States. [3] Its natural habitats are temperate forests , temperate shrubland , rivers , intermittent rivers, freshwater marshes , freshwater springs , arable land , and urban areas .
The Georgetown salamander is active year-round. The Georgetown salamander is believed to reproduce in the winter, as many other Eurycea species do. [5] [7] The salamanders produce an estimated 30 to 50 eggs per clutch, but likely lay them individually. The hatchlings are about 1 cm long and grow rapidly until they reach a head-trunk length of ...