- A
protoconch (meaning
first or
earliest or
original s****) is an
embryonic or
larval s****
which occurs in some
classes of molluscs, e.g., the initial...
- Trochop**** of
Haliotis asinina with
calcified protoconch (pc)
prior to torsion....
-
Protoconch—a
larval s**** of a mollusc; also
refers to
protoconch whorls of an
adult s**** Teleoconch—all the
whorls of a s****
after the
protoconch whorls...
-
consisted of an
ovoid protoconch and
several chambers. The
protoconch had two layers, and
several compartments -
called "
protoconch pockets" -
formed between...
- end of the
protoconch. It is also
strongly sculptured (mamillated), and at the end of the
protoconch oblique striae can be seen. The
protoconch is irregularly...
- more
primitive nautiloids by the
small size and
globular shape of the
protoconch, the so-called
embryonic s****.
Nautiloids have
relatively large embryonic...
-
whorls known as the
protoconch,
which is
often quite distinct from the rest of the s**** and has no
growth lines. From the
protoconch,
which forms the apex...
- s**** show a long tower-shaped
protoconch or
embryonic s**** of 5 whorls,
which is
usually lost in the adult. This
protoconch is
about 2.5 cm long and looks...
- etc.). (The
homologous structure in
gastropods (snails) is
called the
protoconch.) The
prodissoconch is
often but not
always smooth, and has no growth...
- on the page. The spire, when it is not
damaged or eroded,
includes the
protoconch (also
called the
nuclear whorls or the
larval s****), and most of the...
