Holocephali
Squalomorpha
Batoidea
tribasic pectoral fin
enlarged pectoral fins
hypotremate gills
autostyly
Galeomorpha
tooth whorls
(chimeras, ratfish)
(angel sharks, sawfish,
dogfish)
(typical sharks)
(skates, rays,
guitarfish)
dibasic
pectoral fin
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