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The beak of a giant squid. All extant cephalopods have a two-part beak, or rostrum, situated in the buccal mass and surrounded by the muscular head appendages. The dorsal (upper) mandible fits into the ventral (lower) mandible and together they function in a scissor-like fashion. [1] [2] The beak may also be referred to as the mandibles or jaws ...
Orthoceras is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called Orthoceratites. Note it is sometimes misspelled as Orthocera, Orthocerus or Orthoceros.
The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. [1] The class developed during the middle Cambrian, and underwent pulses of diversification during the Ordovician period [2] to become diverse and dominant in the Paleozoic and Mesozoic seas.
Belemnitida (or belemnites) is an extinct order of squid-like cephalopods that existed from the Late Triassic to Late Cretaceous (And possibly the Eocene [4] [5]).Unlike squid, belemnites had an internal skeleton that made up the cone.
However, other studies have recovered it as an oegopsid squid. [3] Orthocone nautiloids range in size from less than 25 mm (1 in) to (in some giant endocerids of the Ordovician) 5.2 m (17 ft) long. Orthocone cephalopod fossils are known from all over the world, with particularly significant finds in Ontario, Canada and Morocco.
Sphooceras is a genus of primitive cephalopod from the Silurian period. Most fossils have been found in the Czech Republic , but possible fossils may also exist in other countries. [ 1 ] [ 2 ] It is currently known from two species, Sphooceras disjunctum and Sphooceras truncatum .
A 69-million-year-old skull found in Antarctica belonged to what scientists say is the oldest known modern bird.. An early relative of the continent’s ducks and geese, it lived off the Antarctic ...
A fossil cast of the shell of a Baculites grandis on display at the North American Museum of Ancient Life in Lehi, Utah. One notable feature about Baculites is that the males may have been a third to a half the size of the females and may have had much lighter ribbing on the surface of the shell.