Cave salamanders (Eurycea lucifuga) are found throughout the eastern United States. Their range stretches from northeastern Oklahoma to western Virginia. Populations of cave salamanders are more concentrated in the Appalachian Mountain range, reaching from Alabama to northern Virginia. Another dense area includes a span extending through southern Indiana, Kentucky and middle to eastern Tennessee. The westernmost part of their range covers mid to southern Missouri, northeastern Oklahoma and northern Arkansas. (Briggler and Prather, 2006; Camp, et al., 2014; Lanoo, 2005; Petranka, 2010)
Cave salamanders are troglophiles, meaning they can live entirely in caves and depend on cave-like conditions to complete their life cycles. Cave salamanders are mainly found in moist, dark places such as caves, or under rocks and logs. They have been reported in rock crevices along riversides. In southern Illinois adults also inhabit rocky borders of cypress swamp areas. Much of their population, though, live in twilight zones of caves that are confined to limestone regions. (Camp, et al., 2014; Lanoo, 2005; Petranka, 2010)
Cave salamanders are among the largest of their genus. During adulthood their dorsal pigmentation ranges from bright reddish-orange to a bland yellow. Their ventral coloring is a light yellow and does not contain spots. Younger adults are typically more dull in color.
The maximum recorded length of an adult is 181 mm. Cave salamanders have broad, flattened heads. Their large eyes measure roughly the same size as their snout length. Snout lengths for females measure to 62 mm on average while males have snouts that measure 60 mm on average. Both sexes have prehensile tails that constitute 52 to 68% of their total length. Cave salamanders have four slender legs, two long forelimbs, and two short hind limbs. Their front legs have four toes and their back legs have five toes that are webbed.
Sexes are distinguished by a number of physical features. Vents on mature males have large margins contoured with papillae. Mature males are also distinguishable by their longer tail compared to those of females. Male mental glands are also more rounded in comparison to females. (Hutchison, 1966; Lanoo, 2005; Petranka, 2010)
Cave salamanders go through metamorphosis, although populations of this species may mature at different ages. Metamorphosis can occur as early as 6 months and as late as 18 months of age. Young larvae are active day and night. They switch to a more nocturnal lifestyle as they mature.
Their eggs have been measured up to 5 mm in diameter with white yolk that is 2.4 to 3 mm in diameter. Their eggs have two transparent outer envelopes. The outermost of these 2 envelopes is made up of a peripheral gel, while the inner envelope is filled with fluid. Larvae measure up to 10 mm in length when newly hatched. Hatchlings start off at a mere 9 to 12 mm, but can reach up to 58 mm as they approach adulthood. Young larvae have a broad tail fin. These tail fins start at their hind legs and extend to the tips of their tails. Their skin lacks pigmentation, but contains gray spotting. These spots darken as they mature. As cave salamanders grow, their bodies become brighter or darker in color. They begin colorless and later turn a dull yellow to a bright reddish-orange. (Bishop, 1943; Hutchison, 1966; Lanoo, 2005; Petranka, 2010)
Males pursue female salamanders to initiate courtship. Male cave salamanders court females first by pushing and rubbing the snout of the female. Males then press their cheeks against females and move forward. Females use their cheeks to maintain contact with the backs of males. Males press their pelvic area against the females once they have their tails positioned underneath females. Once this is initiated, they both engage in a tail-straddle walk. During this courtship, chemical communication takes place. Pheromones are known to stimulate the vomeronasal organs of cave salamanders. Pheromones also pass neural information to the hypothalamus. This is a part of the brain responsible for the control of sexual receptivity. Not enough research has been done to know the exact mating systems of cave salamanders. All that is known is that one male courts one female at a time. (Houck and Verrell, 1993; Petranka, 2010)
Females typically lay their eggs deep in caves. They lay 49 to 87 eggs, either singly or clustered, at one time. Little knowledge is known about the reproduction of cave salamanders because of their preference for cave habitats. Eggs are mostly laid in springs underground, streams found in caves, or limestone pools away from cave openings. The number of days until hatching depends temperature. The colder the temperatures, the longer it takes for the eggs to hatch. (Petranka, 2010; Ringia and Lips, 2007)
No parental investment, beyond egg-laying, has been reported for cave salamanders. (Lanoo, 2005)
Cave salamanders inhabit the twilight zones of caves along with long-tailed salamanders (Eurycea longicauda). This may cause interspecific competition due to their similar diets. Cave salamanders, along with several other amphibians, have a unique ability to use the earth's magnetic field for navigation. They use this sense as a compass to migrate to different locales within caves.
Cave salamanders depend on cave-like conditions to complete stages of their life cycles, such as metamorphosis. These salamanders migrate in the summer to what is known as their summer habitat and home range. They tend to be more active at the surface of the water during summer months. (Hofrichter, 2000; Lanoo, 2005)
Active ranges for cave salamanders changes according to the season. However, no areas have been reported for home range. These salamanders do not defend territories. (Lanoo, 2005)
Male cave salamanders court females first by pushing and rubbing the snouts of females. It is assumed that mating season occurs during summer and early fall. Cave salamanders communicate using pheromones. Mental glands on their heads assist with transferring pheromones, and Jacobson's organs help them detect chemical signals. Cave salamanders also use the earth's magnetic field to navigate in dark caves. (Houck and Verrell, 1993; Lanoo, 2005; Petranka, 2010)
The diet of cave salamanders consists of small invertebrates. This includes spiders and other small insects. Larvae eat snails, spiders, beetles, and flies. Adults have a more varied diet, hunting prey such as earthworms, ticks, mites, and many other small arthropods. (Petranka, 2010)
Cave salamanders may coil their body and wave their tail above their head. This behavior intimidates potential predators. They also have glands throughout their body that produce noxious secretions. There are no recorded predators of cave salamanders. (Lanoo, 2005; Petranka, 2010)
Cave salamanders commonly carry gastrointestinal parasites. A study showed that 1 or more nematodes were found in 77% of the salamanders tested. The types of parasites found in their gastrointestinal tracts depends on the geographic location in which they live. Parasites that were found include trematodes (Brachycoelium salamandrae) and nematodes (Capillaria inequalis, Oswaldocruzia pipiens, Thelandros magnavulvaris, and Trichoskrjabinia).
Cave salamanders may have interspecific competition with other species of salamander. Often times, cave salamanders will share the twilight zones of caves with other species. (Castle, et al., 2011)
There are no known positive economic impacts of cave salamanders for humans.
There are no known negative economic impacts of cave salamanders for humans.
Cave salamanders are a species of least concern on the IUCN Red List. They are not listed on any other federal or international list. However, cave salamanders are listed as state-endangered in Kansas, Mississippi, and Ohio. They are also reported as rare in West Virginia. No known conservation actions are currently published for this species. (IUCN SSC Amphibian Specialist Group, 2014; Lanoo, 2005)
Sarah Parnell (author), Radford University - Fall 2015, Cari Mcgregor (editor), Radford University, Zeb Pike (editor), Radford University, Karen Powers (editor), Radford University, April Tingle (editor), Radford University, Jacob Vaught (editor), Radford University, Galen Burrell (editor).
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
uses sound to communicate
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
uses smells or other chemicals to communicate
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
mainly lives in water that is not salty.
(as perception channel keyword). This animal has a special ability to detect the Earth's magnetic fields.
A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.
makes seasonal movements between breeding and wintering grounds
having the capacity to move from one place to another.
This terrestrial biome includes summits of high mountains, either without vegetation or covered by low, tundra-like vegetation.
the area in which the animal is naturally found, the region in which it is endemic.
active during the night
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
chemicals released into air or water that are detected by and responded to by other animals of the same species
breeding is confined to a particular season
reproduction that includes combining the genetic contribution of two individuals, a male and a female
associates with others of its species; forms social groups.
uses touch to communicate
Living on the ground.
uses sight to communicate
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Ringia, A., K. Lips. 2007. Ovipposition, Early Development and Growth of the Cave Salamader, Eurycea lucifuga: Surface. Herpetologica, 63/3: 258-268.
Slavens, F., K. Slavens. 1999. "Reptiles and Amphibians in Captivity- Breeding, Longevity, and Inventory" (On-line). Accessed November 20, 2015 at http://www.pondturtle.com/welcome.html#INDEX.