No, not really, beside the streamlined body the smaller vertebrates of Silvanus have no many similarities with their earthly counterparts.
These animals have no eyes because they evolve in total darkness at the ocean floor of Xibalba. They use their flippers and the pumping mechanism of their gills and intestine to move forward. Most of them perceive their enviroment thanks to an olfactory organ at the opening of their gills and because of an very well lateral line system. All species which are shown here feed on plankton. Citoascopera and Scutulapiscis live in deeps between 2 and 5 kilometers while the small Primopiscus lives between 8 and 100m under the surface