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What did Baculites look like?

What did Baculites look like?

The shell morphology of Baculites with slanted striations or ribbing, similarly slanted aperture, and more narrowly rounded to acute keel-like venter points to its having had a horizontal orientation in life as an adult.

What did Baculites eat?

Kruta says Baculites only ate plankton, animals just a few millimetres long that it could crush in its jaws. She found the shell of a snail larva and three fragments of crustaceans inside its jaws. Plankton populations crashed 65 million years ago, so if the ammonites relied on them they would have starved.

Why did Ammonoidea go extinct?

“The Ammonites petered out due to more than one disastrous change caused by the impact. Ocean acidification likely dissolved the shells of their microscopic young, which floated on the ocean’s surface early in their life-cycle.

Are ammonites Nautiloids?

A primary difference between ammonites and nautiloids is the siphuncle of ammonites (excepting Clymeniina) runs along the ventral periphery of the septa and camerae (i.e., the inner surface of the outer axis of the shell), while the siphuncle of nautiloids runs more or less through the center of the septa and camerae.

Where are the fossils of the Baculites found?

Baculites fossils from South Dakota. Some still have traces of the original nacre (shells). Baculites (“walking stick rock”) is an extinct genus of cephalopods with a nearly straight shell, included in the heteromorph ammonites. The genus, which lived worldwide throughout most of the Late Cretaceous, was named by Lamarck in 1799.

What kind of shell does a baculite have?

The genus, which lived worldwide throughout the Late Cretaceous period, was named by Jean Baptiste Lamarck in 1799. The adult shell of Baculites is generally straight and may be either smooth or with sinuous striae or ribbing that typically slant dorso-ventrally forward.

How big was the average size of a baculite?

Adult Baculites ranged in size from about seven centimeters ( Baculites larsoni) up to two meters in length.

How old are the ammonite fossils in Elk Creek?

Jeletzkytes is now a junior subjective synonym (Landman et al., 2010). Seven distinct species of uncoiled Ammonite fossils , called Baculites occur on Elk Creek. They range in age from 69 to 74 million years old.