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A cephalopod of the coast of Sri Lanka. That should test iSpotters!
Any indication of size?
I think is is more likely a squid (which tend to be narrower than Cuttlefish) and possibly the Common Reef Squid [Sepiotheutis lessoniana] is quite small and often found in shallow water and near the surface. Found Red Sea to Polynesia.
Certainly looks like the google images of a reef squid. And beautiful with it.
....squid as well. Sp don't know.
Lat/Lng: 5.04293, 72.88046