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What is the turn of a snails shell called?
Shell Anatomy Glossary
A 360° spiralling turn of the snail’s shell. A line on the outside of the shell between a pair of whorls is called a suture. The body whorl is the largest whorl on the shell, the last to be grown by the snail. It houses the aperture.
What is the winding of a gastropod shell called?
Spiral – direction following the coiling of the gastropod shell. Term usually applied as a modifier to sculptural terms such as ‘spiral cords‘. Spire – series of successive whorls in a gastropod shell, with exception of the last one.
Gastropod (Snails) Shells: Parts of a Shell
Images related to the topicGastropod (Snails) Shells: Parts of a Shell
What are the parts of a shell called?
The top of the coiled shell, where the diameter of the tube is at its smallest, is called the apex of the shell. Each complete turn of the shell tube, each coil, is known as a whorl. The areas where the whorls touch and join each other are called sutures. As the living animal grows, the diameter of its shell increases.
What is shell coiling?
oxford. views 1,428,169 updated. coiling In many univalve and bivalve molluscs (Mollusca) the shells are coiled. The condition is most noticeable among gastropods (Gastropoda) and cephalopods (Cephalopoda), where it is obvious that the shell is a hollow cone, coiled up to a greater or lesser extent.
What is a spire on a shell?
The spire consists of all of the whorls except for the body whorl. Each spire whorl represents a rotation of 360°. A spire is part of the shell of a snail, a gastropod mollusc, a gastropod shell, and also the whorls of the shell in ammonites, which are fossil shelled cephalopods.
What is the spiral of a shell called?
A whorl is a single, complete 360° revolution or turn in the spiral growth of a mollusc shell. A spiral configuration of the shell is found in numerous gastropods, but it is also found in shelled cephalopods including Nautilus, Spirula and the large extinct subclass of cephalopods known as the ammonites.
What is torsion and Detorsion in gastropods?
Torsion allows foot to be retracted after the head for better protection of head. DETORSION. Detorsion is reversal of torsion which takes place when during evolution shell is lost or a type of shell evolves that has openings on the opposite sides. In such situations twisting of visceral mass is not necessary.
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Parts of the Shell and Identification Key – Central and South …
A 360° spiralling turn of the snail’s shell. A line on the outside of the shell between a pair of whorls is called a suture. The body whorl is the largest …
gastropod – The shell – Encyclopedia Britannica
The typical snail has a calcareous shell coiled in a spiral pattern around a central axis called the columella. Generally, the coils, or whorls, …
Class Gastropoda – Digital Atlas of Ancient Life
While gastropods have many different shell shapes (or no shells at all) and lifestyles, they are united by undergoing a process called …
Gastropod shell – ScienceDaily
The gastropod shell is an animal shell which is part of the body of a gastropod or snail.
What is the difference between torsion and coiling?
As nouns the difference between torsion and coiling
is that torsion is twist, twisting while coiling is the pattern or motion of something that coils.
Why do snail shells have spirals?
The spiral shells of snails are often used as a textbook example of biological structures that possess chirality. Shell-coiling is important because a snail’s sexual organs are usually twisted and it is difficult for snails of opposite handedness to reproduce.
What is the name for the entire pointed part of the gastropod shell above where the opening is found?
The pointed end of the shell opposite the aperture is the apex.
Mollusca | Gastropods-Bivalves-Cephlapods |
Images related to the topicMollusca | Gastropods-Bivalves-Cephlapods |
What is the outside of a shell called?
The periostracum (/ˌpɛriˈɒstrəkəm/ PERR-ee-OS-trə-kəm) is a thin, organic coating (or “skin”) that is the outermost layer of the shell of many shelled animals, including molluscs and brachiopods.
What is the apex of a shell?
In anatomy, an apex (adjectival form: apical) is part of the shell of a mollusk. The apex is the pointed tip (the oldest part) of the shell of a gastropod, scaphopod, or cephalopod. The apex is used in end-blown conches.
What is the process of torsion in gastropods?
Torsion is a gastropod synapomorphy which occurs in all gastropods during larval development. Torsion is the rotation of the visceral mass, mantle, and shell 180˚ with respect to the head and foot of the gastropod. This rotation brings the mantle cavity and the anus to an anterior position above the head.
How is the shell of a gastropod formed?
Shell layers
The gastropod shell has three major layers secreted by the mantle. The calcareous central layer, tracum, is typically made of calcium carbonate precipitated into an organic matrix known as conchiolin. The outermost layer is the periostracum which is resistant to abrasion and provides most shell coloration.
Why do gastropods undergo torsion?
Garstang (1928) holds that torsion represents a larval mutation, which is of advantage to the larva and not the adult, a concept shared by Yonge (1947). By rotation the anteriorly placed mantle cavity provides a refuge for the delicate head and velar lobes of the larva, and it is not directly advantageous to the adult.
What’s the inside of a shell called?
This inner layer is known as nacre, or the nacreous layer, and it has a shiny, pearly appearance—think ‘mother of pearl’ shell. The shininess comes from the structure of the aragonite crystals—they form small plate-like structures that diffract light.
What is the pattern of a shell called?
Mathematicians have learned to use Fibonacci’s sequence to describe certain shapes that appear in nature. These shapes are called logarithmic spirals, and Nautilus shells are just one example. You also see logarithmic spiral shapes in spiral galaxies, and in many plants such as sunflowers.
What does Detorsion mean?
detorsion in British English
or detortion (dɪˈtɔːʃən ) noun. archaic. the act of, or the state of having undergone, detorting; a twisting, perversion, or distortion.
Introduction to Gastropoda
Images related to the topicIntroduction to Gastropoda
What is torsion describe?
Definition of torsion
1 : the twisting or wrenching of a body by the exertion of forces tending to turn one end or part about a longitudinal axis while the other is held fast or turned in the opposite direction also : the state of being twisted. 2 : the twisting of a bodily organ or part on its own axis.
What is fouling in gastropods?
Fouling is when waste that is excreted, washes back into the snails gills. To combat fouling, gastropods undergo coiling, this process can occur at the same time as torsion (Hickman et al, 2009). Coiling is what give the shell its trademark swirl.
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