Enseosteus

Enseosteus is an extinct genus of small selenosteid arthrodire placoderms known from the Upper Frasnian Kellwasserkalk facies of Late Devonian Germany^[1] and Morocco.^[2]

Enseosteus Temporal range: Late Frasnian[1]
Enseosteus marocanensis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	†Placodermi
Order:	†Arthrodira
Suborder:	†Brachythoraci
Family:	†Selenosteidae
Genus:	†Enseosteus Jaeckel, 1919
Type species
Enseosteus jaekelli Gross, 1932
Species
E. jaekelli Gross, 1932 E. hermanni Stensiö 1959 E. marocensis Rücklin, 2011
Synonyms
Ottonosteus jaekeli Stensiö, 1959

Enseosteus is very similar to the other Kellwasserkalk selenosteids, though, the type species, E. jaekelli, has a bulbous, knob-shaped rostrum. Denison (1978) synonymizes the genera Ottonosteus (O. jaekeli = E. hermanni) and Walterosteus with Enseosteus, claiming that the two genera are too similar to Enseosteus to merit separate genus status.^[1] Rücklin (2011) agrees with Denison's synonymizing of Ottonosteus, but rejects Denison's synonymization of Walterosteus, claiming how Walterosteus has a contact between the rostral plate and the pineal plate, which Enseosteus does not.^[2]