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미국 신생대 에오세의 대표적인 지층인 그린리버층에서 발견되는 경골어류화석으로 완벽한표본이다. 박물관급으로 전혀손색이 없는 표본임.
경골어류화석(좌측)
Diplomystus dentatus
Order Ellimmichyiformes, Family Ellimmichthyidae
Geological Time: Eocene
Size : Diplomystus: 390mm : Matrix: 1130 by 560 mm
Fossil Site: Green River Formation, Fossil Lake, 18 inch layer, Kemmerer, Wyoming
경골어류화석(우측)
Phareodus encaustus
Order Osteoglossiformes, Family Osteoglossidae
Geological Time: Eocene
Size : Fish fossil is 330 mm in length on Matrix: 1130 by 560 mm
Description(좌측): Diplomystus' morphology, including its upturned mouth is prototypic of a surface feeding fish. The genus are herrings that likely fed on small surface dwelling fish as Knightia, is evidenced by numerous fossils found with Knightia is the stomach or mouth. The genus Diplomystus is also found to occur in Cretaceous strata in South America, as well as Cretaceous Lebanon.
This Diplomystus specimen exemplifies the very best from the Eocene Green River Formation, bone and soft tissue preservation and professional preparation; it is also a real monster. In short, they come no better. The the perimeter of the fish has been sculpted and contoured adding to its inherent
Description(우측): This 50 million year old, Eocene-Era fossil fish comes from one of the world's famous Laggerstatten, the Green River Formation in Wyoming. A small portion of the fish fossils from Green River exhibits such fine preservation. The significant extent of soft-tissue preservation that makes the site famous is evident in this specimen. Notice the teeth present on this fine subadult example.
The genus Phareodus is uncommon in the Green River formation and is readily distinguished by the long pectoral fin and large pointed teeth. There are two species: encaustus and testis, of which encaustus is the larger by nearly a factor of two with a maximum size of 75 cm. Other differences are to be found in the body outline, fin ray count, and scale row number. Phareodus sports teeth that are testament to the fish’s carnivorous habit. In fact, the genus name means "to have tooth", with a higher tooth count also found in P. encaustus. A member of family Osteoglossidae (bony-tongues), it has extant cousins found in Central-South America and Southeast Asia, known as the Arrowana and Arapaima. The genus is known from the Eocene deposits of North America and Australia.
