Sexing hynobiids

TJ

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I just acquired what I was told are a male-female pair of H.nigrescens, but want to be doubly sure. Anybody know how to sex them? I'd sure like to make an attempt at breeding them
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1ST ONE:

5990.jpg


5991.jpg


2ND ONE:

5992.jpg


5993.jpg
 

TJ

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1ST ONE:

5997.jpg


2ND ONE:

5998.jpg
 

TJ

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I was surprised to find I'd answered my own question in advance in an old post:

http://www.caudata.org/forum/messages/13/166.html

in which I'd provided the following link to a page on "Sexual Dimorphism in Vents" by Dr. Masato Hasumi (for photos and info on sexing nigrescens during the breeding season).

http://www5d.biglobe.ne.jp/~hasumi/photo/vent_e.html

Ah well...
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Here's another reference:

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(though a different sal)

From:

Biology of Amphibians
The John Hopkins University Press
By William E. Duellman and Linda Trueb
Illustrated by Linda Trueb
 
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