When I first saw the pic I immediately thought Raninus and believe of your suggestions Raninus is easily the best. You're absolutely right though on them being very similar to Bufonius. Before Bufonius started being imported more regularly Raninus was one of the most likely members of psuedopimelodidae to be run into, right behind Iheringi. Unfortunately though for what ever reason they've become less readily available for some time now at least in my experience. Just like Bufonius these guys are like little cephalosilurus amazing ambush predators. Their jaws can close with considerable force more then enough to ensure that none but the biggest of prey has a chance of escaping and their gut can easily stretch to accommodate large prey. I'd personally be very wary about keeping them with fish their own size or smaller because at night these guys become brazen and can easily take out a sleeping fish.First, we need to know the ID. I don't think yours is a bufonis (but the info in that thread is relevant still) but rather or perhaps a Batrochoglanis raninus: http://www.planetcatfish.com/common/species.php?species_id=721