- Look up
torsion in Wiktionary, the free dictionary.
Torsion is a
gastropod synapomorphy which occurs in all
gastropods during larval development. Torsion...
-
present in all gastropods, but the
opisthobranch gastropods are
secondarily untorted to
various degrees.
Torsion occurs in two stages. The first, mechanistic...
-
Barrandeocarpus is a
genus of
Ordovician mitrate thought to
resemble the
ancestral untorted morphology of the group. Ubaghs,
Georges (1979). "Trois
mitrata (Echinodermata:...
-
minority view that the
Bellerophontida actually represented a more primitive,
untorted type of mollusk, (see Torsion)
which evolved a
spiral s**** independently...
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Monoplacophorans are
univalved (though not gastropodal), limpet-shaped, and are
untorted. They have a
pseudometamerism of
bilaterally symmetrical repeated organs...
-
placement in the
Paragastropoda is
based on the ****umption
these animals were
untorted, that is they
lacked the
twisted viscera that are
present in
modern gastropods...
- of gastropod-like
molluscs proposed for
forms which they
concluded had
untorted bodies.
Bouchet & Rocroi, 2005,
tentatively included the
Macluritidae within...
- Monoplacophorans. The
class was
erected by Peel in 1991.
These animals were
untorted and they had a coiled, cone-shaped s****. The
majority of
species were...
- are a
group of
mollusks that
superficially resemble gastropods, but were
untorted). A list of
superfamilies and
families (both
living and fossil)
which show...
-
molluscs proposed for gastropod-like
forms which they
interpreted as
being untorted - that is
viscerally not twisted. The
Onychochilidae was at that time placed...
