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" ... Is there a chance that megamouth sharks could produce bioluminescence, though? “Based on bacterial detection as well as histological and reflectance analyses, our results strongly support the statement that the megamouth shark, M. pelagios, is not a luminous shark species,” the researchers reported. ... "
" ... So, it would make sense that there are some glow-in-the-dark shark species. Among the Squaliformes order of sharks, bioluminescence has been documented for two deep-sea families: Dalatiidae and Etmopteridae, with a third (Somniosidae) recently added to the list due to the velvet dogfish (Zameus squamulosus) recently illuminating us that yes, it is luminous. Glowing sharks are not a new observation, with the first mentions of shark light emission dating back to as early as the 1840’s. Yet, because scientists have so much to learn about sharks, we are still learning which species are luminescent. Which is why it is so exciting that Kiwi and Belgian researchers studying sharks off the east coast of New Zealand have found three species that glow - including the largest known luminescent vertebrate, the kitefin shark (Dalatias licha). Also known as the seal shark, it is a deepwater shark that can gouge out chunks of flesh like their infamous cookiecutter shark relatives. Most reach about 47 inches (120 centimeters) in length although they are thought to measure up to 70 in (180 cm); they have beautiful green eyes to see their intended prey of mesopelagic and bottom-dwelling fishes, cephalopods, crustaceans and polychaete worms. ... "