| Stenosteus | |
|---|---|
 | |
| Stenosteus angustopectus | |
Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Placodermi |
| Order: | †Arthrodira |
| Suborder: | †Brachythoraci |
| Family: | †Selenosteidae |
| Genus: | †Stenosteus Dean, 1901 |
| Type species | |
| Stenosteus glaber Dean, 1901 | |
| Species | |
| |
Stenosteus is anextinctmonospecificgenus of medium-sizedselenosteidarthrodireplacoderms of theLate Devonian period known from the UpperFamennianCleveland Shale ofOhio. Estimated skull lengths range from 6 to 9 centimeters[1] Most fossils ofStenosteus have been scraps of armor and portions of tooth-plates suggestive ofSelenosteus. In 1996, enough material of a new species,S. angustopectus, was recovered to allow a reconstruction of armor that resembles that ofSelenosteus.[2]
Stenosteus is a member of thefamilySelenosteidae of thecladeAspinothoracidi, which belongs to the cladePachyosteomorphi, one of the two major clades withinEubrachythoraci. Thecladogram below shows thephylogeny ofStenosteus:[3]
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