It appears to be a genetic mutation of sorts that survived for a few years in the depths of Mexican waters.
https://metro.co.uk/2020/02/20/weir...phin-head-tadpole-tail-washes-beach-12271659/


https://metro.co.uk/2020/02/20/weir...phin-head-tadpole-tail-washes-beach-12271659/


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