Sexing hynobiids

[TJ]

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

1ST ONE:

2ND ONE:

 

[TJ]

1ST ONE:

2ND ONE:

 

[TJ]

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...

Here's another reference:

(though a different sal)

From:

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

 

[TJ]

Here's a link on how to sex them. Male in top pic, female in bottom one:

http://www.xto.2y.net/tec/hansyoku/sansyou2002/haisyutu.htm