mink frog

(Rana septentrionalis)

Conservation Status
mink frog
  IUCN Red List

LC - Least Concern

     
  NatureServe

N5 - Secure

S5 - Secure

     
  Minnesota

not listed

     
           
           
 
Description
 
 

Mink frog is a medium size frog, 1¾ to 3 long at maturity.

The background color is olive-brown to green. The back and sides are covered with dark brown spots or mottling. The chin, throat, and belly are yellowish-white, and may have gray spotting or mottling. The skin is smooth, not warty. When rubbed the skin emits a mink-like odor that has been compared to rotting onions. There are usually no raised ridges (dorsolateral folds) on the back. If present they are poorly developed.

The disk covering the ear opening (tympanum) in males is larger than the eye. In females it is the same size or slightly smaller than the eye.

The hind feet has a broad web covering all of the toes, with only the tip of the fourth toe free.

 
     
 

Size

 
 

1¾ to 3

 
     
 

Voice

 
 

 

 
     
 

Similar Species

 
  Green frog (Rana clamitans) has well-defined dorsolateral folds on the back. The hind feet are only partially webbed. The skin does not produce a rotting onion odor when rubbed.  
     
 
Habitat
 
 

Lakes, ponds, slow areas of rivers, deep bogs.

 
     
 
Biology
 
 

Behavior

 
 

Adults can often be seen sitting on lily pads.

 
     
 

Lifespan

 
 

Males: 3 years

Females: 4 years

 
     
 

Life Cycle

 
 

Between late May and August the female lays a mass of 500 to 4,000 eggs under water on the submerged stem of an aquatic plant. The egg mass often detaches and sinks to the bottom. The amount of time the eggs take to hatch is variable.

When the egg hatches a tadpole emerges. Some tadpoles metamorphose into froglets after about one year, others require two years. At the time of metamorphosis the froglets are almost 60% of their final adult size.

To avoid freezing, overwintering tadpoles and adults hibernate in the mud at the bottom of the same water they inhabited the rest of the year. They enter hibernation in late September and emerge in late April or early May.

Most mink frogs live only 1 or 2 years after metamorphosis. Males sometimes survive 3 years, females sometimes 4 years.

 
     
 

Tadpole Food

 
 

Algae

 
     
 

Adult Food

 
 

Spiders, snails, dragonflies, whirligig and other beetles, earthworms, and other invertebrates.

 
     
 
Distribution
 
 

Distribution Map

 

Sources

7, 11, 12, 14, 29, 73.

 
  9/29/2015      
         
 

Occurrence

 
 

Common

 
         
 
Taxonomy
 
  Class Amphibia (amphibians)  
  Superorder Batrachia (amphibians)  
  Order Anura (frogs and toads)  
  Suborder Neobatrachia  
  Superfamily Ranoidea  
 

Family

Ranidae (true frogs)  
 

Genus

Rana  
  Subgenus Lithobates (American water frogs)  
       
 

In 2006 most North American true frogs were transferred from the genus Rana to the genus Lithobates by Frost et al. The change was controversial and was not accepted by all authorities. In 2008 and 2009 the change was rejected by Stuart, Pauly et al., and other systematic reviews, and in 2009 North American true frogs were returned to their previous classification. Lithobates is once again a subgenus of Rana. ITIS and Amphibian Species of the World continue to use the 2006-08 classification. NCBI and UniProt use the new classification. AmphibiaWeb suggests using the original name followed by the subgenus name in parentheses, in this case Rana (Lithobates) septentrionalis.

 
       
 

Synonyms

 
 

Lithobates septentrionalis

 
       
 

Common Names

 
 

mink frog

 
       

 

 

 

 

 

Glossary

Dorsolateral folds

Two parallel lines, one on each side of the back, of raised glandular skin between the back and the sides of most North American frogs of the family Ranidae.

 

Tympanum

The circular, disk-like membrane that covers the ear opening of some reptiles and amphibians.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 
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MinnesotaSeasons.com Photos
 
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Camera

     
 
Slideshows
 

Rana [Lithobates] septentrionalis
Jake Scott

  Rana [Lithobates] septentrionalis  
     

 

slideshow

       
 
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Other Videos
 
  Mink Frog (Rana septentrionalis)
WisCBMnetwork
 
   
 
About

Published on Apr 30, 2012

No description available.

 
  Mink Frog
TheChannelOfAnimals
 
   
 
About

Published on Oct 7, 2013

In this video, a mink frog (Rana septentrionalis) is shown by the shore of Kiwassa Lake in the rain. The mink frog is classified by some authorities, including the International Union for the Conservation of Nature (IUCN), under the scientific name Rana septentrionalis. This, however, is not widely accepted. The mink frog is a largely aquatic species of frog found in the northern United States and Canada. They rarely leave the water, unless during or after heavy rain. In this circumstance, it was raining fairly heavily, so I guess I got lucky. The mink frog gets its name from the mink, as they smell alike. The mink frog is assessed as being of least concern by the IUCN Red List of Threatened Species. This video was recorded on the Department of Environmental Conservation (DEC) owned shore of Kiwassa Lake in New York on August 31, 2013.

 
  Mink frogs calling
HerpNet
 
   
 
About

Uploaded on Mar 19, 2009

Mink frogs calling in a Minnesota lake

 
       

 

Camcorder

 
 
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