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Temporal range: Late Frasnian[1]
Enseosteus jaeckeli.jpg
E. jaeckeli
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Placodermi
Order: Arthrodira
Suborder: Brachythoraci
Infraorder: Coccosteina
Superfamily: Dinichthyloidea
Family: Selenosteidae
Genus: Enseosteus
Type species
Enseosteus jaekelli
Gross 1932
  • E. jaekelli Gross 1932
  • E. hermanni (Stensiö 1959)
  • E. marocensis Rücklin 2011
  • Ottonosteus jaekeli Stensiö 1959

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

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]


  1. ^ a b c Denison, Robert (1978). Handbook of Paleoichthyology, Volume 2, Placodermi. New York: Gustav Fischer Verlage. pp. 96–98. ISBN 9780895740274. 
  2. ^ a b RÜCKLIN, MARTIN (January 14, 2011). "First selenosteid placoderms from the eastern Anti-Atlas of Morocco; osteology, phylogeny and palaeogeographical implications". Paleontology. 56 (1): 25–62. doi:10.1111/j.1475-4983.2010.01026.x.