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References: Grande, L. (1982): A Revision of the Fossil Genus Diplomystus, With Comments on the Interrelationships of Clupeomorph Fishes. American Museum Novitates, Number 2728, pp. 1-34, figs. 1-38.

References: Fossil Butte National Monument Geologic Resources Inventory Report, NPS/NRSS/GRD/NRR—2012/587 Grande, L. (1984) PALEONTOLOGY OF THE GREEN RIVER FORMATION, WITH A REVIEW OF THE FISH FAUNA. THE GEOLOGICAL SURVEY OF WYOMING, BULLETIN 63.

Taxonomy from Grande & Bemis 1998. Diagnosis from Grande & Bemis 1998, p. 247: "†Cyclurus gurleyi differs from all other species of the genus by the following adult characters A through D. (A) The body is relatively short and deep, deeper than known for any other amiine and most other amiid species. Body depth of adult sized individuals (e.g., specimens over 120 mm SL) is 35-42% of SL (Table 62), compared to 27-32% for †C. kehreri (Table 52); 19-21% for †C. efremovi (Table 72); 20% for †C. valenciennesi; 30-31% for †C. ignotus; 24-27% for †C. macrocephalus; 18-29% for Amia (Tables 3, 22, 42); 16-23% for † vidalamiines (Tables 82, 102, 112); 18- 23% for †Solnhofenamia gen. nov. (Table 122). (B) The possession of relatively numerous premaxillary teeth, more numerous than in any other amiid (nine to 12, Table 64, versus eight to nine in †C. kehreri, Table 54; seven to nine in †C. efremovi, Table 74; eight in †C. fragosus; eight to nine in †C. macrocephalus; six to eight in Amia, Tables 5, 24, 44; five to six in †Vidalamiinae subfam. nov., Tables 84, 104, 114; five to six in †Solnhofenamia gen. nov., Table 124; five to six in †Amiopsinae subfam. nov., Tables 134, 144, 154, 164). (C) The gular is relatively shorter than in any other species of †Cyclurus (gular length is 32-33% of head length, Table 60, compared to 36-38% of head length in adult †C kehreri, Table 50; 37-40% in †C efremovi, Table 70; and 39% in †C. valenciennesi). (D) There are more dorsal fin rays and dorsal proximal radials in this species than in any other species of †Cyclurus (44-46 segmented dorsal rays and 44-47 dorsal proximal radials, Table 68, compared to 36-39 segmented rays and 37-38 proximal radials in †C kehreri, Table 58; 41 segmented rays and 41 proximal radials in †C. efremovi, Table 78; 39-40 proximal radials in †C. macrocephalus; 39 segmented rays and 38 proximal radials in †C oligocenicus; 38 proximal radials in †C. ignotus). Identified by oilshale using Grande & Bemis 1998. References: Grande, L., & Bemis, W. E. (1998). A Comprehensive Phylogenetic Study of Amiid Fishes (Amiidae) Based on Comparative Skeletal Anatomy. an Empirical Search for Interconnected Patterns of Natural History. Journal of Vertebrate Paleontology, 18(sup001), 1–696. doi:10.1080/02724634.1998.1001111 Grande, L. (2001) An updated review of the fish faunas from the Green River Formation, the world's most productive freshwater Lagerstaetten. In Eocene biodiversity., unusual occurrences and rarely sampled habitats. Gunell, Gregg F., eds, Topics in Geobiology, Vol 18, p. 1-38.

Taxonomy from Fossilworks.org. Revised generic diagnosis from Grande and Grande 2008, p. 10. "†Notogoneus differs from all other genera in the family Gonorynchidae by the following characters: (1) the subopercle bears a series of deep clefts along its posterior margin; (2) the first and second hypurals are not fused to each other; (3) the parhypural is not fused to the vertebral column; (4) the first and second hypurals are not fused to the vertebral column; and (5) scales in adults are nearly the length of a centrum. Also, the frontal is a paired element in †Notogoneus (vs. median in Gonorynchus)." Line drawing from Grande & Grande 2008, p. 4: References: Cope, E. D. (1885) Eocene paddle-fish and Gonorhynchidae. American Naturalist, 19:1090–1091. Woodward, A. S. (1901) Catalogue of Fossil Fishes in the British Museum (Natural History), Part IV 1-63. Hay, O. P. (1902) Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868. Grande, L. and Grande, T. (2008) Redescription of the type species for the genus Notogeneus (Teleostei: Gonorhynchidae) based on new, well-preserved material. The Paleontological Society Memoir 70:1-31 [M. Uhen/M. Uhen]

References: L. Grande and T. Grande (2008) Redescription of the type species for the genus Notogeneus (Teleostei: Gonorhynchidae) based on new, well preserved material. The Paleontological Society Memoir 70:1-31 [M. Uhen/M. Uhen].

Juvenile Phareodus

The Mioplosus is an extinct genus of Percid fish that lived from the early to middle Eocene. These fish were predators in Fossil Lake's large ecosystem.