Pseudobranchus axanthus Netting & Goin, 1942
Southern Dwarf Siren, Narrow-stripped Dwarf Siren, Everglades Dwarf SIren
© 2010 Todd Pierson (1 of 9)
Adult P. axanthus have a brownish black to light grey ground color and parallel yellow or tan stripes on the back and sides. The stripes run from the head to the tip of the tail (Petranka 1998).The two recognized subspecies may be distinguished by differences in coloration and number of costal grooves. Pseudobranchus a. belli, the Everglades dwarf siren, has 29-33 costal grooves, three narrow, light lines within the mid-dorsal stripe, and two wider, buff-colored bands along the sides of the body. Pseudobranchus a. axanthus, the narrow-striped dwarf siren, has 34-37 costal grooves, a gray ground color, lacks well-defined light stripes and has poorly defined, grayish lateral stripes. Descriptions from Petranka (1988).
Hatchling size is 10-11.5 mm snout to vent length (14.5-16 mm total length) (Petranka 1998).Juveniles differ from adults in the presence of a dorsal fin which extends from the base of the head to the tail tip. (Martof 1972; Petranka 1998).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: United States
U.S. state distribution from AmphibiaWeb's database: Florida
Life History, Abundance, Activity, and Special Behaviors
Often locally abundant. Diet consists of aquatic invertebrates, including earthworms, amphipods, chironomids, and ostracods. When semi-permanent pools dry, dwarf sirens aestivate in burrows 10-30 cm underground. Individuals are likely to be preyed upon by birds, turtles, alligators, and aquatic snakes. When disturbed, dwarf sirens sometimes emit a high-pitched yelp. See Petranka (1998) and references therein.
Trends and Threats
Relation to Humans
Conant, R. and Collins, J. T. (1991). A Field Guide to Reptiles and Amphibians: Eastern/Central North America. Houghton Mifflin, Boston.
Martof, B. S. (1972). ''Pseudobranchus, P. striatus.'' Catalogue of American Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles, 118.1-118.4.
Martof, B. S. (1974). ''Sirenidae. Sirens.'' Catalogue of American Amphibians and Reptiles. Society for the Study of Amphibians and Reptiles, 151.1-151.2.
Moler, P. E., and Kezer, J. (1993). ''Karyology and systematics of the salamander genus Pseudobranchus (Sirenidae).'' Copeia, 1993, 39-47.
Netting, M. G., and Goin, C. J. (1942). ''Descriptions of two new salamanders from peninsular Florida.'' Annals of the Carnegie Museum, 29, 175-196.
Petranka, J. W. (1998). Salamanders of the United States and Canada. Smithsonian Institution Press, Washington D.C. and London.
Sever, D. M., Rania, L. C. and Krenz, J. D. (1996). ''Reproduction of the salamander Siren intermedia Le Conte with especial reference to oviducal anatomy and mode of fertilization.'' Journal of Morphology, 227, 335-348.
Originally submitted by: Meredith J. Mahoney (first posted 2000-07-13)
Edited by: M. J. Mahoney, JG (fixing maps 7/25/01), Kevin Gin (12.03) (2003-12-04)
Species Account Citation: AmphibiaWeb 2003 Pseudobranchus axanthus: Southern Dwarf Siren <https://amphibiaweb.org/species/4312> University of California, Berkeley, CA, USA. Accessed Mar 24, 2023.
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Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 24 Mar 2023.
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