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A small schooling fish, Knightia made an abundant food source for larger Eocene predators. The Green River Formation has yielded many fossils of larger fish species preying on Knightia; specimens of Diplomystus, Lepisosteus, Amphiplaga, Mioplosus, Phareodus, Amia, and Astephus have all been found with Knightia in either their jaws or stomachs. [4]
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.
Acropholis stensioei (fossil at the Geological Museum in Copenhagen) is a taxon referred to Palaeonisciformes based on superficial resemblance with Palaeoniscum. The systematics of fossil and extant fishes has puzzled ichthyologists since the time of Louis Agassiz, who first grouped all Palaeozoic ray-finned fishes together with Chondrostei (sturgeons, paddlefishes), gars, lungfishes, and ...
A newfound fossil of a jawless fish is the oldest known vertebrate cranium preserved in 3D. The 455 million-year-old find could illuminate how vertebrate heads evolved.
The fossil was recovered among the Chengjiang fauna, in one of a series of Lagerstätten sites where thousands of exquisitely preserved soft-bodied fossils have already been found. [7] Following the discovery of the holotype, additional Lower Cambrian fossils of Haikouichthys ercaicunensis have been discovered. [3] Haikouichthys reconstruction
In contrast, the long-nosed Rolfosteus measured just 15 cm. [2] Fossils of Incisoscutum have been found containing unborn fetuses, indicating that arthrodires gave birth to live young. [ 3 ] [ 4 ] A common misconception is the arthrodires (along with all other placoderms) were sluggish bottom-dwellers that were outcompeted by more advanced fish.
It is assumed that Titanichthys was a filter feeder that used its capacious mouth to swallow or inhale schools of small, anchovy-like fish, or possibly krill-like zooplankton, and that the mouth-plates retained the prey while allowing the water to escape as it closed its mouth. A study has since confirmed this assumption as its jaws are ...
A Late Pliocene fossil from Rębielice Królewskie , of Piacenzian age (around 3 Ma), could be an ancestral bluethroat. A supposed Sylvia warbler fossil from the late Gelasian of Bad Deutsch-Altenburg ( Austria ), about 2 Ma old, may be of a Luscinia instead; due to its recent age it probably belongs to a living species or its immediate ancestor.