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n.1.(Paleon.) Any fossil fish belonging to the Pycnodontini. They have numerous round, flat teeth, adapted for crushing.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Important faunal components include a crustacean referable to nephropid decapods of the subfamily Homarinae, sharks of the genera Pseudohypolophus, Leptostyrax, and Rhinobatos, the albulid fish Casierius, pycnodont fishes of the genera Nonaphalagodus, Macromesodon, and Callodus, the semionotid Lepidotes, amiid fishes, and a eucryptodire turtle.
The most commonly occurring fossils within this unit are bony fishes, consisting of numerous isolated scales and teeth, as well as toothplates of pycnodont and albulid fishes.
Vertebrate fossils collected within the one-meter interval below the Paluxy-Glen Rose contact include isolated teeth of pycnodont and amiid fishes.
These include isolated teeth of the batoid genera Pseudohypolophus and Rhinobatos, along with isolated teeth and toothplates of several bony fishes including amiids, albulids, and pycnodonts. Also included are isolated plates, vertebrae and limb bones of turtles.
(2005): Pycnodont fishes: morphologic variation, ecomorphologic plasticity, and a new interpretation of their evolutionary history.
Specialized groups such as pycnodonts and amiiforms managed to keep teleosteans out of their niches for a remarkably long time, an indication that the evolutionary novelties of the Teleostei per se were not enough to grant them immediate dominion in specialized niches until drastic changes in the environment did occur (Poyato-Ariza, 2005).