Definition of Protoconch. Meaning of Protoconch. Synonyms of Protoconch

- 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...
- 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...
- more primitive nautiloids by the small size and globular shape of the protoconch, the so-called embryonic s****. Nautiloids have relatively large embryonic...
- molecules. In this way the larval s**** (protoconch) is formed. The construction of the haliotid protoconch is complete following torsion. These structures...
- etc.). (The homologous structure in gastropods (snails) is called the protoconch.) The prodissoconch is often but not always smooth, and has no growth...
- 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...
- 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...