-
Cephalaspidida is an
extinct order of
jawless fish in the
subclass Cornuata. Undichna, a fish-fin, or fish-swimming
fossil trail left as a
fossil impression...
- sand slug, is a
species of
predatory sea slug with an
internal s****, a
cephalaspid opisthobranch, or head-shield slug. It is a
marine gastropod mollusc...
- two
major groups, the more
primitive heterostracans and the
cephalaspids. The
cephalaspids were more
advanced than the
heterostracans in that they had...
-
classification of lampreys,
because lampreys were once
thought to be
related to
cephalaspids. If
lampreys are included, they
would extend the
known range of the group...
- to
Devonian period in what is now
Europe and
North America. A
typical cephalaspid,
Hemicyclaspis had a
heavily armored, shovel-shaped headshield. It is...
-
classification of lampreys, as
lampreys are
sometimes thought to be
related to
cephalaspids. If
lampreys are included, they
would extend the
known range of the group...
-
Uppsala University.
cephalaspidomorphi at users.atw.hu/fishindex On the
cephalaspid fauna of the
Podolian plateau. PP
Balabai -
aukovi zapysky Naukovo-pryodo-znavcogomuzeâ...
-
Museum (Natural History)
Geology 38(5)
pages 309--334 (1985) On the
cephalaspid fauna of the
Podolian plateau. PP
Balabai -
aukovi zapysky Naukovo-pryodo-znavcogomuzeâ...
- of the Cephalaspidomorphi.
Fossil evidence now
suggests lampreys and
cephalaspids acquired their shared characters by
convergent evolution. The 5th edition...
-
existed in two
major groups, the more
primitive heterostracans and the
cephalaspids. Later,
about 420
million years ago, the
jawed fish
evolved from one...
