The solution to Bit-o-Critter round 19

Juliebug correctly identified the round 19 bit-o-critter as a remora, Remora remora.  These bizarre fish use a modified first dorsal fin as a sort of sucker to hold onto other species, usually bigger things like turtles, sharks and whales.  Its actually not much of a sucker, more of a friction pad, but thats another topic for another day.  Congrats Julie!  Photo by Rene Gallo