Everything about Rudists totally explained
Rudists are a group of bizarrely shaped
marine heterodont bivalves that arose during the
Jurassic, and became so diverse during the
Cretaceous that they were major reef-building organisms in the
Tethys Ocean. The Jurassic forms were elongate, with both valves being similarly shaped, often pipe or stake-shaped, while the reef-building forms of the Cretaceous had one valve become a flat lid, with the other valve becoming an inverted spike-like cone. They were among the many animal groups that perished during the
Cretaceous–Tertiary extinction event .
The rudists are, according to different systematic schemes, placed in the
orders
Hippuritoida or
Rudistes (sometimes
Rudista). Their "classic"
morphology consisted of a lower, roughly conical
valve that was attached to the seafloor or to neighboring rudists, and a smaller upper valve that served as a kind of lid for the organism.
Their classification as true reef-builders is controversial, yet they were one of the most important constituents of
reefs during the Cretaceous period.
(External Link
) At one point, rudist reefs fringed the
North American coast from the
Gulf of Mexico to the present-day
Maritime Provinces. Because of their high
porosity, rudist reefs are highly-favored
oil traps.
Further Information
Get more info on 'Rudists'.
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