- bottom-dwellers, as
shown by
traces of ab****n of the
ventral surfaces of
their headshields.
Pteraspidomorphs have been
first regarded as
related to bony fishes...
-
northwestern Zhejiang Province,
Southeast China. It is
known from more than 20
headshields and at
least 20 of them
include three-dimensionally
preserved neurocrania...
-
Protopteraspis also did not
possess the
cornua (horns)
found on the
headshields of
other pterapsids; rather, it had "small points"
behind the gill opening...
- The
order Cephalaspidea, also
known as the
headshield slugs and
bubble snails, is a
major taxon of sea
slugs and
bubble snails,
marine gastropod mollusks...
-
which had a
superficial resemblance to the Osteostraci, had an
elongate headshield, that,
coupled with its spear-like rostrum, gave it a throwing-dart-like...
-
marine opisthobranch gastropod mollusc in the
order Cephalaspidea, the
headshield slugs. This
species has a
maximum size of 70 mm. The
background color...
-
opisthobranch gastropod mollusks.
These are not nudibranchs;
instead they are
headshield slugs, in the
clade Cephalaspidea.
Family names such as this one, Aglajidae...
-
anteriorly positioned headshield, and a trunkshield. A pair of antennae-like
structures emanate from
underneath the base of the
headshield, and
there are numerous...
- The
largest known osteostracan is Parameteoraspis, its crescent-shaped
headshield was 35 to 40 cm wide. They were
probably relatively good swimmers, possessing...
- of
unstalked eyes on the top of the
headshield and pair of
stalked eyes
attached to the underside. The
headshield also has four
pairs of
biramous (two...
