Biologists say they have unlocked secrets about the vampire squid, a mysterious creature that feeds on the decaying dead in the unlit depths.
The squid is so weird that it is known as a "phylogenetic relic". It has the honour of occupying a taxononomic category all of its own, combining features of octopuses and squids in a unique evolutionary formula that has survived for millions of years.
As Vampyroteuthis infernalis - the "squid from hell" - it is the only species in the Order Vampyromorpha, where it was placed in 1903.
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