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Rhenanida ("Rhine fish") were flattened, ray-like, bottom-dwelling predators with large, upturned mouths that lived in marine environments. The rhenanids were once presumed to be the most primitive, or at least the closest to the ancestral placoderm, as their armour was made of unfused components—a mosaic of tubercles—as opposed to the ...
The genus name Potanichthys is a portmanteau of the Ancient Greek ποτάνος (potanos, winged/flying) and ιχθύς (ichthys, fish). The species epithet refers to Xingyi city which is near the site where Potanichthys was discovered. [2] [3] Potanichthys was a small fish with an estimated total length of 15.3 cm (6.0 in). It shared ...
The study of prehistoric fish is called paleoichthyology. A few living forms, such as the coelacanth are also referred to as prehistoric fish, or even living fossils, due to their current rarity and similarity to extinct forms. Fish which have become recently extinct are not usually referred to as prehistoric fish.
Tharrhias is an extinct genus of prehistoric bony fish that lived during the Aptian stage of the Early Cretaceous epoch. [1] The type species T. araripis is named after the Araripe Basin, in which it was found in sediments of the Santana Formation. Crab prezoea larvae have been found fossilised in the stomach contents of Tharrhias. [2]
Onychodontiformes (also known as Onychodontida and Struniiformes) is an order of prehistoric sarcopterygian fish that lived during the Devonian period. The onychodontiforms are generally regarded as early-diverging members of the coelacanth lineage.
Onychodus (/ ɒ ˈ n ɪ k ə d ə s /, from Greek meaning "claw-tooth") [1] is a genus of prehistoric lobe-finned fish which lived during the Devonian Period (Eifelian - Famennian stages, around 374 to 397 million years ago). It is one of the best known of the group of onychodontiform fishes.
Pteraspidomorphi is an extinct class of early jawless fish. They have long been regarded as closely related or even ancestral to jawed vertebrates, but the few characteristics they share with the latter are now considered as basal traits for all vertebrates.
Guildayichthyidae is a prehistoric family of marine fish from the Mississippian Bear Gulch Limestone of Montana. [ 1 ] [ 2 ] It is the only family in the order Guildayichthyiformes . Guildayichthyids possess an uncommon mixture of primitive and modern characteristics in their skull bones.