-
Acanthodii or
acanthodians is an
extinct class of
gnathostomes (jawed fishes). They are
currently considered to
represent a
paraphyletic grade of various...
- lampreys)
Gnathostomata or
jawed vertebrates,
which include: †Placodermi †
Acanthodii Chondrichthyes or
cartilaginous fish, (sharks, rays and ratfish) Osteichthyes...
- (chimaeras and
extinct relatives)
class Placodermi (armoured fish) †
class Acanthodii ("spiny sharks",
sometimes classified under Actinopterygii) † Superclass...
-
extinct (armored gnathostomes) └Eugnathostomata (true
jawed vertebrates) ├─
Acanthodii (stem
cartilaginous fish) └─Chondrichthyes (true
cartilaginous fish) ├─Holocephali...
-
synapomorphies can
ultimately be
found in
several chondrichthyan groups.
Acanthodii Euteleostomi Zhu M, Yu X,
Ahlberg PE, Choo B, Lu J, Qiao T, Qu Q, Zhao...
-
Females attain a
larger size than males. The
largest of the now-extinct
Acanthodii was
Xylacanthus grandis, an
ischnacanthiform based on a ~35 cm (14 in)...
- gnathostomes)
class Chondrichthyes (cartilaginous fish; 900+ species)
class †
Acanthodii (Paleozoic "spiny sharks";
paraphyletic in
relation to Chondrichthyes)...
- fish
known as placoderms,
which evolved from the ostracoderms; and the
Acanthodii (or
spiny sharks). The
jawed fish that are
still extant in
modern days...
- This
article contains a list of all of the
classes and
orders that are
located in the
Phylum Chordata.
Order Amphioxiformes Genus Pikaia †
Order Enterogona...
- ? †
Acanthodii...