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Taxonomy from fossilworks.org. Woodward 1901, p. 66: “Head and trunk much laterally compressed, but elongated. Mouth terminal, the mandible with truncated symphysis and high coronoid region; a single series of small, conical marginal teeth; stouter and blunter teeth within the mouth, but apparently not on the parasphenoid. About 10 branchiostegal rays. Vertebral about 90 to 100 in total number, the centra short and deep, marked with delicate longitudinal ridges. Pelvic fins scarcely smaller than the pectorals, which are inserted high on the flank; dorsal fin extending for more than half of the back; anal fin short, opposed to or behind file posterior end of the dorsal; caudal fin deeply forked. Scales elliptical, not pectinated.” Forey (1973b, p. 151-152) noted that: "The minor differences between Istieus and Pterothrissus are far outweighed by the many important features of similarity...", but did not synonymized Istieus and the recent genus Pterothrissus because Istieus is based on fossils. Identified by oilshale using Woodward, 1901. References: Agassiz, L. (1839-44) Recherche sur les Poissons fossiles. Neuchatel. Woodward, A. S. (1901) Catalogue of Fossil Fishes in the British Museum (Natural History), Part IV, 1-636. Siegfried, P. (1954) Die Fisch-Fauna des Westfälischen Ober-Senons, Palaeontographica Abteilung A Band A106, Lieferung 1-2 (1954), p. 1 - 36. Forey, P. L. (1973b) Relationships of elopomorphs. In: GREENWOOD, P. H., MILES, R. S. & PATTERSON, C. (eds) Interrelationships of Fishes. Academic Press, London, 351–368.
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Taxonomy from gbif.org. The fish was originally described by Agassiz under the name Osmerus cordieri. Description of the genus by Woodward 1901, p.247 “Head small and trunk moderately elongated, the maximum depth at the insertion of the dorsal fin. Mandibular suspensorium much inclined backwards, and cleft of mouth large; jaws slender, and maxilla not expanded behind; teeth minute, numerous and sharply pointed. Gill-rakers large and slender. Vertebrae about 45 in number, half caudal and half abdominal; the centra at least as long as deep, longitudinally striated; ribs delicate. No fin-rays elongated, but two or three in front of the median fins undivided and spinous. Pectoral fins with about 18 rays, relatively large and inserted just above the ventral border; pelvic fins smaller, with about 10 rays, opposed to the dorsal fin, which is nearly median and comprises about 18 rays; anal fin behind the dorsal, longer than deep, with 20 rays; caudal fin slightly forked. Scales large and uniform, pectinated and serrated, not deepened or thickened along the course of the lateral line.” Identified by oilshale using Woodward, 1901. References: Agassiz, L. (1839-44) Recherche sur les Poissons fossiles. Neuchatel. Marck, W. von der (1858) Zeitschr. deutsch. geol. Ges. vol. x., p. 245. Marck, W. von der und Schlüter, C. (1868) Neue Fische und Krebse aus der Kreide von Westphalen. Palaeontographica, Band 15 Lieferung 6, p. 269 – 305. Woodward, A. S. (1901) Catalogue of Fossil Fishes in the British Museum (Natural History), Part IV, 1-636. Hay, O. P. (1902) Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868. Siegfried, P. (1954) Die Fisch-Fauna des Westfälischen Ober-Senons, Palaeontographica Abteilung A Band A106, Lieferung 1-2 (1954), p. 1 - 36.
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As the picture shows - I found this fossil 2002 in the afternoon, minutes before I finished work as a gardener - I cleaned the plant areas in Havixbeck - a smalltown at the base of the " Baumberge" in Westfalia - Germany. I lived there for 2 and a half years. In this time I collected there some nice fossils of Campanian age. ....but I never found a fish in the fossil - quarries. They are very rare but since the medieval time known and discriped, then forgotten in the last 200 years there had been found some fishes, nearby less than 100 pieces in the quarries at the Baumberge. Some km far away in Sendenhorst they found fish fossils too. They are very similar to the fossils from Santana Formation in Brasil and the Fossils from Lebanon. Is there anybody who can give the little fish a name?