Ordre Résumé for Cyprinodontiformes

  Réf. Princ.
:
  Ordre
:
Cyprinodontiformes rivulines, killifishes and live bearers
  Classe
:
Actinopterygii
  Ordre frère
:
Beloniformes 45 M years
  Réf..
:
  Premier signalement fossile
:
early Tertiary
  Présent dans
:
Marin
Eau douce
Saumâtre
  Remarque
:
Monophyly of this order is recognized on the basis of several derived characters: e.g., caudal fin symmetrical, supported internally by one epural; first pleural rib on second vertebrae rather than third; primitively, low-set pectoral girdle with a scalelike postcleithrum; an alveolar arm of the premaxillae; extended developmental period. In addition, they possess the following characters: lateral line canal and pores chiefly on head, lateral line represented on body only by pitted scales; narial opening paired; branchiostegal rays 3-7; pelvic fins and girdle present or absent; upper jaw bordered by premaxilla only, protrusible; vomer usually present and supracleithrum always present; metapterygoid usually absent and ectopterygoid always absent; parietals present or absent; vertebrae 24-54. Marked sexual dimorphism with the males often brightly colored.
  ClasseÉtymologie
:
Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335.
  OrdreÉtymologie
:
Greek, kyprinos = goldfish + Greek, odous = tooth, teeth + Latin, forma = shape (Ref. 45335).
  Familles
:

Ref.
[ e.g. 9948]                       
Glossary
                    [ e.g. cephalopods]

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