- the
classes mentioned in
accompanying text.
Pentaradiality as a
plesiomorphy Supporters of
pentaradiality as an
initial condition of the
phylum note that...
-
brachiopods (unhinged lamps****), hyoliths, bryozoans, graptolites,
pentaradial echinoderms (e.g. blastozoans,
crinozoans and eleutherozoans), and numerous...
- adults; the most
notable exception is the echinoderms,
which extend to
pentaradial symmetry as adults, but are only
bilaterally symmetrical as an embryo...
- urchins, sea cu****bers and
others are also included,
since they are
pentaradial,
meaning they have five
discrete rotational symmetry.
Echinoderm larvae...
- however, they
initially develop with
mirror symmetry as larvae, then gain
pentaradial symmetry later.
Hexamerism is
found in the
corals and sea
anemones (class...
-
water vascular system and the
visceral coelom. The
starfish is now
pentaradially symmetrical. It
casts off its
stalk and
becomes a free-living juvenile...
-
reproduce these results. Like all echinoderms, sea cu****bers
possess pentaradial symmetry, with
their bodies divided into five
nearly identical parts...
-
Helicocystis is a stalked,
spiralling pentaradial echinoderm known from the
Cambrian Jbel
Wawrmast Formation. Smith, A. B.; Zamora, S. (2013). "Cambrian...
- Ankor,
Martin J.; Darroch,
Simon A. F.; Rahman,
Imran A. (2021-02-18). "
Pentaradial eukaryote suggests expansion of
suspension feeding in
White Sea-aged...
-
Ophiuroidea may have the
strongest tendency toward five-segment
radial (
pentaradial) symmetry. The body
outline is
similar to that of starfish, in that ophiuroids...
