Midge Fly Fossil

 

The image shows a midge fly insect fossil found in the Florissant Formation of Teller County, Colorado, USA. It dates to the Eocene Epoch of the Paleogene Period. Thanks to Doug for the image. Field of view (FOV) is 7 mm.

Snout Beetle Fossil

The image shows a snout beetle or weevil insect fossil of the Order Coleoptera, Family Curculionidae found in the Florissant Formation of Teller County, Colorado, USA. It dates to the Eocene Epoch of the Paleogene Period. Thanks to Doug for the image.

Leidyosuchus wilsoni Crocodile Skull Fossil

 

This crocodile skull fossil was on display at the American Museum of Natural History (AMNH) in New York City in July 2018. The fossil was named Leidyosuchus wilsoni (Mook, 1959). It was found in the Green River Formation at Wamsutter, Wyoming, USA and dates to the Middle Eocene Epoch. Accession number is AMNH 7637 and it is the type specimen. A gift from L. R. Wilson in 1956.

It was described in April 22, 1959 issue of American Museum Novitates in an paper entitled A New Species of Fossil Crocodile of the Genus Leidyosuchus from the Green River Beds by Charles C. Mook.

Learn more about the museum at https://www.amnh.org/

Plecia Twist Fly Fossils

 

These insect fossils were on display at the American Museum of Natural History (AMNH) in New York City in July 2018. They are called Plecia sp. (Wiedemann, 1828) aka Twist Flies. The fossils were found in the Green River Formation at White Mountain, Wyoming, USA and dates to the Eocene Epoch. Accession number is AMNH 28381.

Learn more about the museum at https://www.amnh.org/

 

Mioplosus labracoides Fish Fossil

 

This fish fossil was on display at the American Museum of Natural History (AMNH) in New York City in July 2018. The perch fish was named Mioplosus labracoides (Cope, 1877). It was found in the Green River Formation at Fossil Butte National Monument, Wyoming, USA and dates to the Eocene Epoch. Accession number is AMNH 2972.

Learn more about the museum at https://www.amnh.org/

Leptodesma marcellense Pelecypod Fossil

 

Here are a series of images drawn by Elvira Wood in 1901 which she used to show fossil pelecypod called Leptodesma marcellense (Hall). She described and illustrated it in the 1901 paper Marcellus (Stafford) Limestones of Lancaster, Erie Co. N.Y. on pages 190. Illustrations on plate 9 figures 16 and 17.

Onychochilus nitidulus Gastropod Fossil

 

Here is an image drawn by Elvira Wood in 1901 which she used to show fossil gastropod called Onychochilus (?) nitidulus (Clarke, 1894). She described and illustrated it in the 1901 paper Marcellus (Stafford) Limestones of Lancaster, Erie Co. N.Y. on pages 190. Illustration on plate 9 figure 20. Described as "A small exfoliated specimen."

On page 170, listed as "In bed III is found a minute sinistrally coiled gastropod which corresponds with Clark's description and figures except that, instead of a faint carination of the whorls, there is a distinct spiral band. The concentric growth lines are interrupted in passing over this band, which is apparently partially filled by foreign matter. This feature is well shown on the body whorls of one specimen only, but, if the  discovery of other specimens confirm this observation, they should be referred to the genus Hesperiella of Holzapfel rather than Onychochilus, with which I have doubtfully placed my specimens."