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Blastoids (class Blastoidea) are an
extinct type of
stemmed echinoderm,
often referred to as sea buds. They
first appear,
along with many
other echinoderm...
- A
blastoid is an embryoid, a stem cell-based
embryo model which,
morphologically and
transcriptionally resembles the early, pre-implantation, mammalian...
-
Pentremites is an
extinct genus of
blastoid echinoderm belonging to the
family Pentremitidae.
These stalked echinoderms averaged a
height of
about 11 centimetres...
- eurypterids, trilobites, graptolites, hyoliths,
edrioasteroid crinozoans,
blastoids and acanthodians.
Ouachita and
Innuitian orogenies in
North America. Uralian...
-
small to intermediate-sized
cells with
irregular nuclei.
Blastic (aka
blastoid)
variants have
intermediate to large-sized
cells with
finely dis****d...
-
within the
blastozoans (the
eocrinoids and
their derived descendants, the
blastoids and the cystoids),
whereas the most po****r
alternative suggests that...
-
Echinoids such as
Archaeocidaris and
Palaeechinus were also present. The
blastoids,
which included the
Pentreinitidae and
Codasteridae and superficially...
-
established to encomp****
stalked taxa that were
neither crinoids nor
blastoids. It was
shown to be
polyphyletic in the late 1960s but
continues to be...
-
Cnidaria Anthozoans 96%
Tabulate and
rugose corals died out
Echinodermata Blastoids 100%
Crinoids 98%
Inadunates and
camerates died out
Mollusca Ammonites...
- – so-called "starfish beds". By the late Paleozoic, the
crinoids and
blastoids were the
predominant echinoderms, and some
limestones from this period...
