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References: Reuss, A.E. (1844) Geognostische Skizzen aus Böhmen. – Bd II: Die Kreidegebilde des westlichen Böhmens, ein monographischer Versuch. – C.W. Medau et Comp., Prag, VI+304 pp. Agassiz, L. (1838-1844) Recherches sur les Poissons fossiles. – Tome V, Part 2, Petitpierre, Neuchâtel: 1-160. Laube, G.C. (1901) Synopsis der Wirbelthierfauna der böhm. Braunkohlenformation und Beschreibung neuer, oder bisher unvollständig bekannter Arten. – Abhandlungen des deutschen naturwissenschaftlich-medicinischen Vereines für Böhmen “Lotos”, 2 (1): 107-186. Gaudant, J. (2008): Complements to the anatomical knowledge of Cyclurus macrocephalus REUSS (Pisces, Actinopterygii) from the Eocene of Kučlín, Bohemia, Czech Republic. – Acta Mus. Nat. Pragae, Ser. B, Hist. Nat., 64(1): 3-7, Praha. ISSN 0036-5343.

Cyclurus kehreri, originally assigned to the recent genus Amia, was placed in Cyclurus by Gaudant (1987). References: GAUDANT J. 1999a. — Cyclurus kehreri (Andreae) : une espèce clé pour la connaissance des Amiidae (Poissons actinoptérygiens) du Paléogène européen. Courier Forschungsinstitut Senckenberg 216: 131-165. L. Grande and W. E. Bemis. 1998. A comprehensive phylogenetic study of amiid fishes (Amiidae) based on comparative skeletal anatomy. An empirical search for interconnected patterns of natural history. Society of Vertebrate Paleontology Memoir 4. Journal of Vertebrate Paleontology 18(1, suppl.):1-690

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.