Pycnodontiformes

Pycnodontiformes

      order of extinct fishes of the class Actinopterygii, containing the genus Pycnodus, common in the Jurassic seas of 200 million to 146 million years ago. Pycnodus is typical of pycnodonts, which were characterized by deep, narrow bodies that were very circular in outline in side view. The pycnodonts had a downturned beak and small mouth with an abundance of bulblike, rounded teeth with thick enamel surfaces; these structures enabled pycnodonts to crush their prey, such as the shelled invertebrates of coral reefs.

* * *


Universalium. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Pycnodontiformes — Lebensbild von Gyrodus hexagonus. Fossilien dieses pflasterzähnigen Gyrodontiden finden sich in den oberjurassischen Plattenkalken von Solnhofen Zeitraum Obertrias bis …   Deutsch Wikipedia

  • Pycnodontiformes — Taxobox name = Pycnodontiformes image caption = Gyrodus fossil range = Late Triassic Eocene regnum = Animalia phylum = Chordata classis = Actinopterygii ordo = †PycnodontiformesPycnodontiformes is an extinct order of bony… …   Wikipedia

  • holostean — ▪ fish Introduction       any member of a group of primitive bony fishes (bony fish) that make up one of the three major subdivisions of the superclass Actinopterygii (ray finned fishes). Holosteans are represented today by the bowfins (bowfin)… …   Universalium

  • Neopterygii — Neuflosser Knochenhechte (Lepisosteus sp.) Systematik Unterstamm: Wirbeltiere (Vertebrata) …   Deutsch Wikipedia

  • Formación Glen Rose — Saltar a navegación, búsqueda La Formación Glen Rose, es una formación geológica datada alrededor de 112 a 99,6 millones de años atrás en el Albiano durante el Cretácico inferior, en el Parque Estatal Valle del Dinosaurio en la cañada Rose, en el …   Wikipedia Español

  • Coccodus — Temporal range: Lower Cenomanian[1] …   Wikipedia

  • Coelodus — Scientific classification Kingdom: An …   Wikipedia

  • Mesturus — fossil Scientific classification Kingdom …   Wikipedia

  • Micropycnodon — Temporal range: Santonian[1] …   Wikipedia

  • Nursallia — Conservation status Fossil Scientific classification Kingdom …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”