Order Summary for Lamniformes

  Main Ref
:
  Order
:
Lamniformes mackerel sharks
  Class
:
Elasmobranchii
  Sister Order
:
Carchariniformes 135 M years
  Ref..
:
  First Fossil Record
:
early Cretaceous
  Occurs in
:
Marine
Fresh
Brackish
  Remark
:
Two dorsal fins, without spines; anal fin present; five gill slits, last two may be above pectoral fin; spiracles usually present, small and behind eyes; eyes without nictitating membrane; mouth extending well behind eyes.
  Classetymology
:
Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335.
  Orderetymology
:
Greek, lamna, -es = shark + Latin, forma = shape (Ref. 45335).
  Families
:

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

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