... of Biologists Ltd 2016 Summary: Chondrichthyan fishes (sharks, rays and chimaeras) are exceedingly rare or possibly absent at abyssal depths (>4000 m), unlike bony fishes. This Commentary discusses hypotheses implicating the unusual physiology of chondrichthyans as an explanation for their scarcity...

...Erin L. Blevins; George V. Lauder SUMMARY Rajiform locomotion in fishes is dominated by distinctive undulations of expanded pectoral fins. Unlike other fishes, which typically interact with the fluid environment via multiple fins, undulating rays modulate a single control surface, the pectoral disc...

...D. Michelle McComb; Stephen M. Kajiura SUMMARY The visual fields of elasmobranch fishes are not well characterized even though this is a fundamental element of the visual system. The batoid fishes(skates, rays) form a monophyletic clade within the subclass Elasmobranchii and exhibit a broad range...