Overview
The Clymene Dolphin (Stenella clymene), historically celebrated as the short-snouted spinner dolphin, is an agile, acrobatic cetacean found exclusively within the warm waters of the Atlantic Ocean. Renowned for being one of only two cetacean species known to execute coordinated, longitudinal spinning leaps high above the sea surface, this pelagic marine mammal long perplexed taxonomists. Pioneering genetic analysis confirmed it as an extraordinary biological phenomenon: a fertile hybrid species that naturally arose from ancient ancestral interbreeding between the spinner dolphin (Stenella longirostris) and the striped dolphin (Stenella coeruleoalba).
Biology and Physical Characteristics
Stenella clymene displays a compact, streamlined body with a distinctly short, robust beak bordered by a unique black lip-line and distinctive dark ‘mustache’ patch on the upper jaw. It showcases a handsome, tripartite color pattern: a dark charcoal-gray dorsal cape that dips down in a wave beneath the dorsal fin, light smoky-gray flanks, and a pristine white or soft pink belly. Its jaws house 38 to 49 pairs of small, pointed teeth in each row, exquisitely tailored for seizing slippery, soft-bodied mesopelagic cephalopods and bioluminescent fishes.
Behavior and Ecology
Operating in energetic pods ranging from tens to several hundred individuals, Clymene Dolphins are deep-diving pelagic specialists. During the day, they rest and socialize in open ocean waters, frequently riding the bow waves of fast-moving ships. At night, they dive deeply to the deep scattering layer (depths 250–700 m) to hunt lanternfishes (Myctophidae) and small oceanic squids that migrate toward surface waters under the cover of darkness. In aerial acrobatics, they frequently breach and spin up to four complete rotations along their longitudinal axis before re-entering the water cleanly.
Conservation and Human Impact
Evaluated as Least Concern by the IUCN, the Clymene Dolphin maintains healthy offshore populations across the Gulf of Mexico, the Caribbean, and the tropical Mid-Atlantic. Because it lives far offshore in deep pelagic waters, it avoids many near-shore pollutants, though it remains vulnerable to incidental entanglement in commercial pelagic driftnets and longline fishing gear. Scientific research utilizes passive acoustic hydrophone arrays to monitor their high-frequency echolocation clicks and whistle communications across oceanic basins.
Interesting Factoid
This incredible oceanic dolphin is one of the only mammals on Earth created by natural ancient hybridization between two different dolphin species, and it can leap ten feet out of the ocean while spinning like a drill!
Last updated: October 2026