User blog comment:FairyRaven/Fairy Tail Chapter 346: Retrogression Magic, Review and Commentary/@comment-1359064-20130802130317/@comment-7418318-20130802132947

That'd be a pretty short time to form a guild.

Besides there are enough reptilians with spine-fins even in the real world. They might have an alligator, cameleon or some kind of lizard as their motive

Or maybe they are somehow connected with or inspired by the kind of Lizardman that Elfman got the take-over from that he beat Bacchus with.