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Nelson, J.S., 1994

Lamniformes mackerel sharks

Elasmobranchii

Carchariniformes 135 M years

Shirai, S., 1996  | 

early Cretaceous

بحري

طازج

مياه مخلوطة

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.

Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335.

Greek, lamna, -es = shark + Latin, forma = shape (Ref. 45335).

( n = 7 ) -
Alopiidae Cetorhinidae Lamnidae Megachasmidae Mitsukurinidae Odontaspididae Pseudocarchariidae

Ref.
[ e.g. 9948]                       

Glossary
                    [ e.g. cephalopods]