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Frog: Cape River

Find, identify & discuss the marine species of SANParks
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Imberbe
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Frog: Cape River

Unread postby Imberbe » Fri May 01, 2009 10:39 pm

Siobain wrote:Thanks Imberbe,

since I've joined the blog, I've learned you're the one to ask about amphibians,
help me with this one...

Image

He's in our Koi pond every night.
Sorry, perhaps i should start a new thread.

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Imberbe
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Re: Identification help: amphibians

Unread postby Imberbe » Fri May 01, 2009 10:41 pm

Is that in Bloemfontein Siobain?
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Imberbe
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Re: Identification help: amphibians

Unread postby Imberbe » Fri May 01, 2009 11:55 pm

My first impression was that it is a Foam nest frog. But they do not naturally occur in the Freestate.
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Siobain
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Re: Identification help: amphibians

Unread postby Siobain » Sat May 02, 2009 4:52 am

Yes Imberbe, this is in Bloemfontein.
I was told it could be an albino Rana??
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Imberbe
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Re: Identification help: amphibians

Unread postby Imberbe » Sat May 02, 2009 1:00 pm

No, it is very unlikely that it is the Plain Grass frog. Again, wrong distribution area. The hind legs of the PG frog is shorter than the one on the photo, the nose is much more pointed, and it is a nice tawny colour. The "cover" you are referring to is common amongst frogs.

Colour with frogs can be very confusing, since there is much variation. Some species are indeed capable of altering the pigmentation in their skin, to become a whitish colour. This is mainly used to reflect sunlight and help with temperature regulation.

The Ranas, or rather Afranas, are know as the River frogs. There are a few species, and they do resemble this frogs build. Looking at distribution there are two possibilities, nl. the Common River frog and the Cape river frog. This one resembles the Cape river frog more than the Common, especially looking at the kind of "flat" snout. Again, the colour is totally different than the usual colouration, but as mentioned, this is not unknown.

I do not think this is an albino, since there is colour on its body.
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Siobain
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Re: Identification help: amphibians

Unread postby Siobain » Sun May 03, 2009 8:07 pm

I thought i would just add a second photo that i took this evening,
just to give a different angle.

Image

Image

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Rusty Justy
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Re: Identification help: amphibians

Unread postby Rusty Justy » Tue May 12, 2009 11:10 pm

I'd go with Cape River Frog, The broadness of the snout, the length of webbing on the longest toe, as well as the bulging of the eyes not extending past the line of the head like the common River frog, which also has shorter webbing and a narrower head...The pigment isnt albinism, but probably leucism(The lack of mellanin) Like we see in birds and some mammals....

I also believe Elsa's Bullfrog, to be African and not Giant.....Distribution(According to Frogs and Frogging), and distance of the tympanum from the eye are pointers.
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Siobain
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Re: Identification help: amphibians

Unread postby Siobain » Tue May 26, 2009 4:29 pm

Thanks RJ. The thing that confuses me though is the webbing seems to
be like the 'Common River Frog' although his eyes are within the outline
on the head like a 'Cape River Frog'. In my research it says 'more extensive webbing distinguishes the 'Cape River Frog' from the 'Common' or does
this not make any difference?
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Rusty Justy
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Re: Identification help: amphibians

Unread postby Rusty Justy » Tue May 26, 2009 6:05 pm

Pleasure Siobain, this frog seems to have more extensive webbing then a Common River Frog I think......which is another reason I went for the Cape River Frog Id :D
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