Acephaly
Acephaly (in Greek: a = without / képhalê = head) is a term used to define:

In medicine:
in forensic medicine: a decapitated corpse whose head has not been found
Twin reversed arterial perfusion
an animal without a head. For example:
Great scallop
Maggot, the larva of the fly
a relatively complete sculpture, the head of which has not been found. For example:
Winged Victory of Samothrace
Venus of Arles
Commons:Category:Headless statues