Istieus grandis Agassiz 1842

Taxonomy

Bonefish

Kingdom: Animalia
Phylum: Chordata
Class: Actinopteri Cope 1871
Order: Albuliformes Greenwood et al. 1966
Family: Albulidae Bleeker 1859
Genus: Istieus
Species: Istieus grandis
Author Citation Agassiz 1842

Geological Time Scale

Eon: Phanerozoic
Era: Mesozoic
Period: Cretaceous
Sub Period: None
Epoch: Late
International Age: Campanian

Stratigraphy

Baumberge Formation

Provenance

Acquired by: Purchase/Trade

Dimensions

Length: 25 cm

Location

Baumberge
Coesfeld
Nordrhein-Westfalen
Germany

• baumberge
• campanian
• cretaceous
• istieus
• pterothrissus
• tff-oilshale-ch2204

Comments

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.