Checklist of Amphibian Species and Identification
Guide
Chorus Frogs
Southeastern Chorus Frog, Pseudacris feriarum
Boreal Chorus Frog, Pseudacris maculata
Western Chorus Frog, Pseudacris triseriata
These Chorus Frogs, like other members of the genus Pseudacris,
are small frogs with a loud voice. Their call is easily mistaken for that
of a larger frog. Their maximum snout-vent length is about 1.5 inches
long. Previously, these three species were regarded as one divided into
four subspecies. Two of these four races, the Upland Chorus Frog and the
New Jersey Chorus Frog, are still considered subspecies of each other
and are now placed under the species name Pseudacris feriarum,
the Southeastern Chorus Frog. These species are very similar in appearance
and can be hard to distinguish from one another in areas where their range
overlaps. Even their calls are quite similar. |
New name |
Old name |
Common name |
Pseudacris feriarum feriarum |
Pseudacris triseriata feriarum |
Upland Chorus Frog |
Pseudacris feriarum kalmi |
Pseudacris triseriata kalmi |
New Jersey Chorus Frog |
Pseudacris maculata |
Pseudacris triseriata maculata |
Boreal Chorus Frog |
Pseudacris triseriata |
Pseudacris triseriata triseriata |
Western Chorus Frog |
|
![chorus frog](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/chorus1.jpg) |
The Boreal Chorus Frog is characterized by very short legs, with
the tibia (leg segment below the knee) being shorter than that of the
Western Chorus Frog, which it resembles closely. Both are characterized
by usually having 3 dark bands on its dorsal surface. In the Boreal Chorus
Frog the cenral band may or may not be broken, while in the Western Chorus
frog it is more likely to be solid. There are two more lateral stripes
that pass from the snout through the eyem and terminate somewhere along
the side of the frog. |
![chorus frog](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/chorus2.jpg) |
However, the color and pattern of the Boreal Chorus Frog is highly
variable. They generally have a pale gray to brown background color, but
some specimens may be red or a bright green as can be seen in the 6 photos
above. Also, the three stripes are present to varying degrees and can
be nearly absent. All of the specimens in the photos above come from the
same area in North Dakota showing the high degree of variability within
a population. |
![chorus frog](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/chorus3.jpg) |
The Boreal Chorus Frog is one of the earliest amphibians to emerge.
They are usually out before the snow and ice has completely melted. The
picture to the right was taken of one that had been found on a snow drift.
You can just see the outline of melted snow around his body indicating
that he had been there for awhile. |
![Western Chorus Frog](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/wchorus3.jpg) |
These are photos of the Western Chorus Frog, Pseudacris triseriata.
As you can see, they are not so different from the Boreal Chorus Frogs.
You can usually determine which species you have by checking the range
map below, but in regions where they overlap it may be difficult. The
legs of the Western Chorus Frog are longer and the lower leg segment (below
the knee) is longer in relation to the rest of the leg than in the Boreal
Chorus Frog. The Western Chorus Frog is also much more likely to have
a solid stripe down the middle of its back, but the stripes may not be
visible as in the photo to the upper right. |
![Upland Chorus Frog](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/uchorus.jpg) |
This is an example of an Upland Chorus Frog, Pseudacris
feriarum feriarum. These frogs are highly variable and may or may
not have three stripes on their dorsal surface. These stripes, however,
are most often broken up into spots. There are also usually two lateral
stripes that pass from the snout through the eye and into the groin.
(In the Western Chorus frog it usually terminates before the groin.)
This particular specimen is completely unspotted. However, it still
retains the stripe through the eye.
The New Jersey Chorus Frog, Pseudacris feriarum kalmi
(not shown) usually has three broad, well defined dorsal bands.
These two frogs are collectively called the Southeastern Chorus
Frog, Pseudacris feriarum. |
![Chorus Frog Range](https://webarchive.library.unt.edu/eot2008/20090513080835im_/http://www.npwrc.usgs.gov/resource/herps/amphibid/pics/range36.gif)
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