looks like a half eaten spermatophore to me. I know some species eat it to get rid of all traces of the smell etc.
Personally speaking if she was successfully mated get the male out of there! my lovely girl ate 2 males after mating with each one!
Some people have kept them together without a problem but I like to play safe. Kuma had his poss gravid female flat rock (
hadogenes paucadins) eat the smaller member of the group.
Anyway... good luck
loads of info about rearing hadogenes species on the site
one more note... jealous of the
a.australis