Basic hynobiid breeding questions here

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paris

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i have never seen egg sacs in person and have only photos to go on-i can tell they are laid in paired sets, but since they are 2 sacs-will there be more than 1 male that can be the parent? the 'midwifing' illustration i have seen only shows a male grabbing 1 sac (this is of the ranodon sal). i am also wondering if the 2 sacs are all there is-or does a female lay multiple pairs of egg sacs?
 
i found this-although the illustration makes it look like 1 egg sac
http://images.google.com/imgres?imgurl=http://www5d.biglobe.ne.jp/~hasumi/gif/mating.gif&imgrefurl=http://www5d.biglobe.ne.jp/~hasumi/figure/spawn_j.html&h=226&w=324&sz=4&tbnid=EZB1svhhaecJ:&tbnh=79&tbnw=113&start=57&prev=/images%3Fq%3Dhynobius%26start%3D40%26hl%3Den%26lr%3D%26safe%3Doff%26sa%3DN
but im still wondering if they just lay one set or multiples? tarichas lay clumps at a time and im wondering if these are all that a female has or is equivalent to a 'clump'?
 
Paris, one deposition is one pair of egg-sacs. so per year (or bi-annualy) a female lays just 1 time.
 
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