Order Summary for Anguilliformes

  Main Ref
:
  Order
:
Anguilliformes eels and morays
  Class
:
Actinopterygii
  Sister Order
:
Saccopharyngiformes 85 M years
  Ref..
:
  First Fossil Record
:
middle Cretaceous
  Occurs in
:
Marine
Fresh
Brackish
  Remark
:
Pelvic fins and skeleton absent; pectoral fins and girdle absent in some; pectoral fins, when present, at least midlateral in position or higher and skeleton lacking bony connection to skull (posttemporal absent); dorsal and anal fins confluent with caudal fin (caudal fin rayless or lost in some); scales usually absent or, if present, cycloid and embedded; body very elongate (eel-like); gill openings usually narrow; gill region elongate and gills displaced posteriorly; gill rakers absent; pyloric caeca absent; maxilla toothed, bordering mouth; the two pre-maxillae (rarely absent), the vomer (usually), and the ethmoid united into a single bone; branchiostegal rays 6-49; swim bladder present, duct usually present; oviducts absent; opisthotic, orbitosphenoid, mesocoracoid, gular plate, posttemporal, postcleithra, supramaxilla, and extrascapular bones absent; ossified symplectic absent (cartilaginous one present in Synaphobranchidae); hyomandibular united with quadrate; ribs present or absent.
  Classetymology
:
Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335.
  Orderetymology
:
Latin, anguila = eel + Latin, forma = shape (Ref. 45335).
  Families
: