Acanthosepion
Acanthosepion is an extinct genus of cephalopod belonging to the order Belemnoidea. These creatures lived during the Late Cretaceous period, approximately 100 to 66 million years ago. Fossils of Acanthosepion have been found in various locations across the globe, indicating a wide geographic distribution. They were characterized by a unique internal shell structure, known as a rostrum, which played a vital role in their buoyancy and defense mechanisms.
Common Names
Acanthosepion is commonly referred to as a "belemnite," a term that encompasses several extinct cephalopods with similar shell structures. However, it's important to note that "belemnite" is a broader term and not specific to Acanthosepion.
Characteristics
Acanthosepion possessed a distinctive rostrum, which is a pointed, elongated structure that extended from the cephalopod's body. The rostrum was composed of calcite and played a crucial role in buoyancy control. Additionally, Acanthosepion had a well-developed phragmocone, a chambered part of the shell filled with gas to help the animal float. Like other belemnoids, Acanthosepion had a fleshy mantle and ten arms, with two of them being longer and adapted for prey capture. The arms were equipped with hooks for grasping prey.
Environments
Acanthosepion thrived in marine environments, likely inhabiting a range of depths. Their fossils have been discovered in various sedimentary deposits, suggesting that they were adaptable to different habitats. The presence of hooks on their arms suggests that Acanthosepion were likely active predators, feeding on smaller marine organisms.
References
For further information and detailed scientific analysis on Acanthosepion, please refer to the following resources: