-
Arkarua adami is a small,
Precambrian disk-like
fossil with a
raised center, a
number of
radial ridges on the rim, and a five-pointed
central depression...
- and
Parsley (2000): In this theory, the
controversial Ediacaran fossil Arkarua is
tentatively placed as the
sister to all
other echinoderms. Helicoplacoidea...
-
preserved to
analyze its characteristics. One much
earlier form
called Arkarua has been
hypothesized to be an
ancestral echinoderm because of its fivefold...
- such
their true
affinity remains uncertain.
Another Ediacaran fossil,
Arkarua, may
represent the
earliest echinoderm,
while Yanjia****a from the early...
- More than 100
genera have been described, and well
known forms include Arkarua, Charnia, ****insonia, Ediacaria, Marywadea, Cephalonega, Pteridinium,...
- however, have been
interpreted as
early molluscs (Kimberella),
echinoderms (
Arkarua), and
arthropods (Spriggina, Parvancorina).
There is
still debate about...
- needed]
having been
interpreted as
early molluscs (Kimberella),
echinoderms (
Arkarua) and
arthropods (Spriggina, Parvancorina, Yilingia). Still,
debate exists...
- however, have been
interpreted as
early molluscs (Kimberella),
echinoderms (
Arkarua), and
arthropods (Spriggina, Parvancorina).
There is
still debate about...
- however, have been
interpreted as
early molluscs (Kimberella),
echinoderms (
Arkarua), and
arthropods (Spriggina, Parvancorina).
There is
still debate about...
- Some
authors propose that an
enigmatic Ediacaran (about 600 Ma)
organism Arkarua is also an edrioasteroid, but this
interpretation did not gain wide acceptance...
