Belemnoidea
Belemnoidea
Belemnoidea (pronunciation: /bɛlɛmˈnɔɪdiə/) is a group of extinct marine cephalopods belonging to the subclass Coleoidea. They are commonly referred to as belemnites.
Etymology
The term Belemnoidea is derived from the Greek word 'belemnon', which means 'dart' or 'javelin', and 'eidos', meaning 'form' or 'shape'. This refers to the characteristic dart-like shape of the belemnite's internal shell, known as the rostrum.
Description
Belemnoidea were squid-like creatures that existed from the Late Triassic to Late Cretaceous. They had a hard, internal, elongated shell called a rostrum, which is the most commonly found belemnite fossil. The rostrum was located at the posterior of the creature, with the soft body and tentacles at the anterior. The rostrum provided balance and buoyancy.
Classification
Belemnoidea is a part of the subclass Coleoidea, which also includes modern squids and octopuses. The order Belemnitida is the most well-known order within the Belemnoidea, and it is often used synonymously with the term 'belemnites'.
Related Terms
- Cephalopod: A member of the molluscan class Cephalopoda, which includes squids, octopuses, and nautiluses. Belemnoidea is a part of this class.
- Coleoidea: A subclass of cephalopods, including squids, octopuses, and belemnites.
- Rostrum: The internal shell of a belemnite, often preserved as a fossil.
- Belemnitida: An order within the Belemnoidea, often used synonymously with 'belemnites'.
External links
- Medical encyclopedia article on Belemnoidea
- Wikipedia's article - Belemnoidea
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