Whaling in the ancient world utilised tridentsCome on...whatcha got in mind?
they didn't have barbs on them
the usual practice was to jump onto the whales back and stab it as many times as you could before you fell off
this is because of the shortness of the teeth of the trident wouldn't stand any chance of killing the whale outright
but it would distress the whale a great deal
a distressed whale has two options
drown
or beach itself
so using a trident on a whale is a good way of getting it to deliver itself to the beach of your choice no towing required
if you did this to the alpha male or female the rest of the pod would also beach themselves even though they weren't injured
the fijian islanders used this method of hunting so succesfully that it was traditional to have body armour made from sperm whale ivory
as were necklaces being both made form the teeth

even in the places where whaling is allowed trident whaling isn't because it is regarded as inhumane
Charlie
your specimen is a thoracic vertebra
But I don't know what animal
most likely reptile or lizard
most probably crocodile
