Some 80 million years ago, when dinosaurs roamed our planet, southern Sweden was located at the shores of a subtropical sea. One particular location, the old quarries at Ivö Klack, exposes an exceptional palaeo-environment that is only rarely preserved in the fossil record: a rocky shore with oyster-encrusted boulders. The mud that accumulated between these boulders millions of years ago contains the fossil remains of the animals that lived in and around the rocky shore. One of these animals is the brittle star named after Avatar: Ophiocoma avatar.
Brittle star skeletons tend to fall apart very quickly after death. As a result, most brittle-star fossils consist of tiny skeletal fragments that are collected with the sieve. The original fossil of Ophiocoma avatar is a fragment from the arm skeleton that carried the long arm spines.
The Avatar brittle star belongs to a genus that nowadays lives along tropical and subtropical shores. They are known to hide under rocks and in crevasses at daytime and emerge at night to collect food particles with their spiny arms. A remarkable feature of living Ophiocoma species is that many of them are capable of sight, without even having eyes or a brain! They can literally see with their entire body surface, and some even change color between day and night as part of a sunglass effect. Whether the Avatar brittle star exhibited the same features is impossible to determine based on fossils alone. What we can say, however, is that Ophiocoma avatar is by far the oldest known representative of this exciting group of brittle stars.
The name Ophiocoma avatar, is valid for eternity. Avatar is now a part of the Earth’s history, of the palaeontological heritage of Sweden, and has gained a small piece of immortality.
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