Amyzon gosiutensis Grande, Eastman & Cavender, 1982

Taxonomy

Sucker

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Cypriniformes Bleeker 1859
Family: Catostomidae Agassiz, 1855
Genus: Amyzon
Species: Amyzon gosiutensis
Author Citation Grande, Eastman & Cavender, 1982

Geological Time Scale

Eon: Phanerozoic
Era: Cenozoic
Period: Paleogene
Sub Period: None
Epoch: Eocene
International Age: Ypresian

Stratigraphy

Green River Formation
Laney Member

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 20 cm

Location

Fontenelle Reservoir
Lincoln County
Wyoming
United States

• amyzon
• fontenelle reservoir
• green river formation
• laney member
• sweetwater
• tff-oilshale-ch1107
• wyoming

Comments

Amyzon is a Catostomid fish so far known from most of the Lake Gosiute localities but not in Fossil Lake deposits or Lake Unita deposits.

Taxonomy from Mindat.org.
Diagnosis from Grande et al. 1982, p. 524: "A species of Amyzon which differs from all others in having the following combination of characters: body depth 36 to 44%, head length 29 to 33% of standard length; 22 to 24 principal dorsal fin rays; 34 or 35 vertebrae (including Weberian complex); long pelvic splint (unsegmented bony ray) about 50% or more of fin length. Of the six previously described species of Amyzon, A. gosiutensis most closely resembles A. aggregatum Wilson (1977) from British Columbia. Meristic and morphometric data for these two species are presented in Table 1. Amyzon gosiutensis differs from A. aggregatum in having fewer dorsal fin rays, larger maxilla length/standard length ratio, and larger preanal length/standard length ratio."

Line drawing from Grande et al. 1982, p. 524:

Identified by oilshale using Grande et al. 1982.
References:
WILSON, M. V. H. (1977): Middle Eocene freshwater fishes from British Columbia. Life Sci. Contrib. Roy. Ontario Mus. 113, 1-61.
Grande, L., Eastman, J. & Cavender, T. (1982): Amyzon gosiutensis, a New Catostomid Fish from the Green River Formation. Copeia, 1982(3), 523-532.