Eroteltuinidae

Eroteltuinidae is a small, enigmatic family of extinct cartilaginous fishes, possibly related to the modern-day sharks and rays. The family is known only from fossilized teeth, which are characterized by their complex structure and distinctive shape. These teeth are typically small, triangular, and exhibit a prominent cusp with serrated edges. The enameloid cap, which covers the dentine, is also a notable feature, often showing longitudinal striations.

Fossils attributed to Eroteltuinidae have been discovered in various locations worldwide, with specimens found in deposits dating primarily to the Jurassic and Cretaceous periods. The geographical distribution suggests that these fishes inhabited a wide range of marine environments, from shallow coastal waters to deeper oceanic regions. However, the scarcity of complete skeletal remains makes it challenging to reconstruct their overall anatomy and ecological role with certainty.

The exact phylogenetic placement of Eroteltuinidae within Chondrichthyes remains a subject of ongoing research and debate among paleontologists. While some studies suggest a link to the Selachimorpha (sharks), others propose a more basal position within the cartilaginous fish lineage. The unique morphology of their teeth differentiates them from most other known fossil shark groups, highlighting their distinct evolutionary path. Further discoveries of more complete specimens are crucial for a definitive understanding of this extinct family.