Ctenothrissiformes

Ctenothrissiformes is an extinct order of prehistoric acanthomorph ray-finned fish, known from the mid-late Cretaceous of Europe and the Middle East.

Ctenothrissiformes Temporal range: Late Cretaceous, Cenomanian–Turonian PreꞒ Ꞓ O S D C P T J K Pg N
Fossil of Ctenothrissa vexillifer
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Clade:	Acanthomorpha
Order:	†Ctenothrissiformes Berg 1937
Families
Aulolepidae Patterson 1964 Ctenothrissidae Woodward 1901
Synonyms
Ctenothrissoidei

Taxonomy

• Order Ctenothrissiformes Berg 1937^[1][2]
  • Family †Aulolepidae Patterson 1964
    • Genus †Aulolepis Agassiz 1836 non Geinitz 1849
      • †A. reussi Geinitz 1849
      • †A. typa Agassiz 1844
    • Genus †Cyclolepis Geinitz 1868 non Gillies ex Don 1832 non Moquin-Tandon 1834
      • †C. agassizi Geinitz 1868
      • †C. stenodina Cockerell 1919
  • Family †Ctenothrissidae Woodward 1901
    • Genus †Heterothrissa Gaudant 1978
      • †Heterothrissa signeuxae Gaudant 1978
    • Genus †Ctenothrissa Woodward 1899
      • †C. enigmatica Gaudant 1978
      • †C. microcephala (Agassiz 1835-1838) [Beryx microcephalus Agassiz 1835-1838]
      • †C. protodorsalis Gaudant 1978
      • †C. radians (Agassiz 1835-1838) [Beryx radians Agassiz 1835-1838]
      • †C. signifer Hay 1903
      • †C. vexillifer (Pictet 1850) [Beryx vexillifer Pictet 1850]

During the mid-20th century, it was briefly suspected that the ctenothrissiforms could be a Lazarus taxon that survived to the modern day, based on the discovery of specimens of the deep-sea fish "Macristium", which closely resembled the extinct Ctenothrissa. However, further discoveries of "Macristium" specimens proved that this genus actually represented the larval form of the aulopiform Bathysaurus, refuting the speculation over surviving ctenothrissiforms.^[3]

Timeline of genera