Turban Shells (Turbinidae)

Over 500 species, possess a hard, limy operculum. The largest number of the family is the Green Turban. Its white operculum may weigh up to one pound.

Indo-Pacific Top Shells.

Commercial Trochus 5”.
Trochus niloticus Linne.
Indo-Pacific Top Shells vary greatly in form and color. The button top (Umbonium), mud-dwellers from Japan and Southeast Asia, are unusually flattened.

Top Shell (Trochidae)

Top shell (Trochidae) are conical. They have a pearly interior and a thin, horny operculum with many whorls. Over a thousand species are found mainly in temperate and tropical waters. Largest and most useful is the Commercial Trochus, which was ounce use to make shirt bottons. It may take six years to take this species to [...]

True Limpets, Patellogastropoda.

True Limpets, Patellogastropoda.
Phylum: Mollusca
Class: Gastropoda
Order: Patellogastropoda
Number of families: 5
Thumbnail description
Cap-shaped snails typically found on wave-exposed rocky shores
Evolution and systematics
There are numerous limpet taxa in the Paleozoic fossil record, however none possesses unique characteristics that convincingly place these taxa within the order Patellogastropoda. The earliest patellogastropod verified by shell microstructure is from the Triassic of Italy, [...]

Keyhole Limpets (Fissurellidae)

Keyhole Limpets (Fissurellidae) are named for a small hole at the top of their conical shell, which serves for excretion. Several hundred species are vegetarians, living primarily in shallow, warm water. The single eggs are coated in a gelatinous membrane.  The largest species comes from California.

Abalone Shells (Haliotidae)

RED ABALONE AND ITS NATURAL HISTORY
The red abalone is a gastropod (univalve) having a large, oval shell shaped like a shallow bowl. It is the largest of California’s marine snails and one of several abalone species inhabiting the California coast. The shells of some archaeological specimens are close to 30 cm in length, and lengths [...]

Slit Shell (Pleurotomariidae)

 
 Slit Shell (Pleurotomariidea) are primitive snails characterized by paired drills and kidneys. The slit in the shell is a natural opening for the passage of water and waste materials. The slit snail, found in very early fossil deposits, were once consider to be extintc. Today, 25 living deep water species are known.

Taxonomy of Mullusks (Cephalopod)

Cephalopod

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Cephalopods
Fossil range: Late Cambrian – Recent

A variety of cephalopod forms from Ernst Haeckel’s 1904 Kunstformen der Natur.

Scientific classification

Kingdom:
Animalia

Phylum:
Mollusca

Class:
Cephalopoda
Cuvier, 1797

Orders

Subclass Nautiloidea

†Plectronocerida
†Ellesmerocerida
†Actinocerida
†Pseudorthocerida
†Endocerida
†Tarphycerida
†Oncocerida
†Discosorida
Nautilida
†Orthocerida
†Ascocerida
†Bactritida

Subclass †Ammonoidea

†Goniatitida
†Ceratitida
†Ammonitida

Subclass Coleoidea

†Belemnoidea

†Aulacocerida
†Belemnitida
†Hematitida
†Phragmoteuthida

Neocoleoidea (most living cephalopods)

?†Boletzkyida
Sepiida
Sepiolida
Spirulida
Teuthida
Octopoda
Vampyromorphida

The cephalopods (Greek plural Κεφαλόποδα (kephalópoda); “head-feet”) are the mollusc class Cephalopoda characterized by bilateral body symmetry, a prominent head, and a modification of [...]

Taxonomy of Mollusks (Chitons)

Chitons are small to large, primitive marine mollusks in the class Polyplacophora. There are 900 to 1,000 extant species of chitons in the class, which was formerly known as Amphineura[1]).
These mollusks are also sometimes commonly known as sea cradles or “coat-of-mail shells”. They are also sometimes referred to more formally as loricates, polyplacophorans, and rarely [...]

Taxonomy of Mollusks (Bivalves)

Bivalve Anatomy
(Note: Colors have been added to distinguish organs; they are not the natural colors.)
 
 Clams
Clams, such as the northern quahog, are bivalves, meaning that they have shells consisting of two halves, or valves. The valves are joined at the top, and the adductor muscles on each side hold the shell closed. If the adductor muscles [...]