Good question, Dolphy ^__^ To be absolutely honest, the mods haven't talked about that yet (as far as I remember). New species are not often submitted, and we just agreed that a member wanting to add a new species to the game would have to first submit a document defining their culture, etc, etc, before submitting a character for approval belonging to that species. That way, all mods would have the opportunity to check and give feedback about that species. We never agreed on how many approvals were necessary, but I'll tell you what: I will personally try and contact the other mods as soon as possible to talk about this, kay? Mind you, two of them at least are not available during the weekend.
I've checked the addition you made, and I really see no problems with it either, so I'm giving you my approval too, kay? With just one observation: The Delphini order already have the echolocation power, and with this added detail they can also detect weaknesses in a foe close to them, determine if they're injured or not, even pregnant, etc etc. I think you've balanced it very well and I really see no problems with it, but I'm gonna say that any new characters beloging to this species will have to take these inherent abilities into consideration to balance any extra magical powers they can have (all ponies of darkness can have something extra). Not that they can't have extra magical powers. Only that we should take it into consideration to keep balance. In the case of Delfina there's no problem at all, of course, since you've given her no extra powers. I mean for future characters, kay?
With three official approvals, I'd normally say go ahead with it. But since you've brought up the issue of how many approvals are necessary, I don't really think I have the authority to deny the remaining mods the opportunity to give their feedback. They might have seen this and not given feedback because they see no problems, but also they could have not seen this, or are waiting to mull it over carefully and are still willing to say something. So just a little bit of patience, kay? ^__^ Like I said, I'll try to contact them as soon as possible just to make sure that they have nothing to say, and then I'll try to discuss with them about how many approvals should be necessary for a new species. Sounds fair? (blinks)