title: Acanthoceratidae
text: # Acanthoceratidae
  
  Acanthoceratidae is an extinct family of acanthoceratoid cephalopods in the order Ammonitida, known from the Upper Cretaceous. The type genus is Acanthoceras.
  
  ## Diagnosis
  
  Acanthoceratidae species are strongly tuberculate with at least umbilical and ventrolateral tubercles in most genera included. Ribs are dominant in some, in others weak or absent on the outer whorls. Most are evolute, compressed to very depressed in section. Sutures are ammonitic with little variation, but showing a tendency for simplication in later genera.
  
  ## Taxonomy
  
  Acanthoceratidae de Grossouvre, 1894 includes the following subfamilies.
  
  * Acanthoceratinae de Groussouvre, 1894
  * Euomphaloceratinae Cooper, 1978
  * Mammitinae (Hyatt, 1900) (= Fallotitinae Wiedmann, 1960; Mitoniainae Renz & Alvarez, 1979)
  * Mantelliceratinae Hyatt, 1903
  