brittle stars: https://www.inaturalist.org/observations/41934992
Grand Cayman; Southern Stingray
Love these guys...
Humann & Deloach call this Darkheaded Blenny, Emblemariopsis sp. Exact species is difficult to determine.
Not sure if this was a sea snake or an eel?
Snorkeling at Governor's Reef (max depth less than 20ft/6m).
K. sectatrix or K. incisor. Lots of them, following snorkelers around. Humann & Deloach's book has the note "reliably distinguishing between these two species while underwater is considered impossible-- fin ray and gill raker counts are required for confirmed identification."
Snorkeling in at most 15 ft / 5 m of water.
Bermuda Chubs or Yellow Chubs. Fish book says they can only be told apart by counting fin rays.