Osteichthyes - Protospondyli - Eugnathidae

Synonym: Isocolum Egerton 1868

Full reference: P. G. Egerton. 1868. On the characters of some new fossil fish from the Lias of Lyme Regis. Quarterly Journal of the Geological Society 24:499-505

Parent taxon: Eugnathidae according to A. S. Woodward 1895

Sister taxa: Allolepidotus, Callopterus, Heterolepidotus, Lophiostomus, Neorhombolepis

Subtaxa: Osteorachis granulatum, Osteorachis macrocephalus

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Type: Osteorachis macrocephalus

Ecology: