AmphibiaWeb - Rana grylio
Rana grylio
Pig Frog, American Pigfrog
Subgenus: Aquarana
family: Ranidae
Taxonomic Notes: This species was placed in the genus Lithobates by Frost et al. (2006). However, Yuan et al. (2016, Systematic Biology, doi: 10.1093/sysbio/syw055) showed that this action created problems of paraphyly in other genera. Yuan et al. (2016) recognized subgenera within Rana for the major traditional species groups, with Lithobates used as the subgenus for the Rana palmipes group. AmphibiaWeb recommends the optional use of these subgenera to refer to these major species groups, with names written as Rana (Aquarana) catesbeiana, for example.

© 2006 John Measey (1 of 13)
Conservation Status (definitions)
IUCN (Red List) Status Least Concern (LC)
NatureServe Status Use NatureServe Explorer to see status.
National Status None
Regional Status None
Access Conservation Needs Assessment Report.



View distribution map in BerkeleyMapper.
View Bd and Bsal data (2 records).

R. grylio reaches a length of up to 165 mm. It has a green to dark brown dorsum scattered with irregular dark markings. The throat and ventral and posterior surfaces of the hind legs can be heavily mottled, or the venter may be immaculate. It has no dorsolateral folds, but it does have a pointed snout, fully webbed toes, and a fourth toe which is only slightly longer than the adjacent toes. The young have dorsolateral stripes like Rana virgatipes.

Distribution and Habitat

Country distribution from AmphibiaWeb's database: United States. Introduced: Bahamas, China, Puerto Rico.

U.S. state distribution from AmphibiaWeb's database: Alabama, Florida, Georgia, Louisiana, Mississippi, South Carolina, Texas


View distribution map in BerkeleyMapper.
View Bd and Bsal data (2 records).
Its range is comprised of the Coastal Plain from the Santee River, South Carolina to Galveston Bay Texas, and includes all of Florida.
R. grylio occurs in standing water.

Life History, Abundance, Activity, and Special Behaviors
Eason and Fauth (2001) suggest that Rana grylio is not restricted by hydroperiod, indicating they may metamorphose more quickly than previously thought.


Altig, R. and Lohoefener, R. (1963). ''Rana grylio.'' Catalogue of American Amphibians and Reptiles. American Society of Ichthyologists and Herpetologists, 286.1-286.2.

Eason, G.W., Fauth, J.E. (2001). ''Ecological correlates of anuran species richness in temporary pools: A field study in South Carolina, USA.'' Israel Journa of Zoology, 47, 347–365.

Originally submitted by: Franziska Sandmeier (first posted 2001-02-21)
Edited by: Arie van der Meijden (28/2/2001), Updated by AnnT. Chang (2013-08-05)

Species Account Citation: AmphibiaWeb 2013 Rana grylio: Pig Frog <> University of California, Berkeley, CA, USA. Accessed Oct 19, 2021.

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Citation: AmphibiaWeb. 2021. <> University of California, Berkeley, CA, USA. Accessed 19 Oct 2021.

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