There are many types of shellfish, common red shell, salamander shell, snail, conch, clams, clams and so on.

1, red shell

Also known as arkshell, belongs to the class of valvulariaceae, family arkshell. Common edible mollusks, can be cultured. The shell is large and thick, the left and right shells are equal, obliquely ovoid, extremely swollen.

The top of the shell is swollen and protruding, and the radial ribs are wide, smooth and without obvious nodules. About 42-48, 43 is more. Shell surface white, covered with a few brown tomentum; shell inner surface white, hinge straight, hinge teeth about 70.

2. Turban shell

Sea snails. The shell is thick, the mouth of the shell is wide, and the shell surface may have bead-like protrusions, tumor protrusions, or ribbed lines. The largest species is the East Indies and Australia's luminous turban snail (Turbo marmoratus), the body snail layer above the layers like bulbs or some of the Oriental countries with a turban, so its English name.

The snail's mouth cover is particularly thick, calcareous, often uneven, or with curved ridges. Most species are spherical or turbinate-shaped, with shell surfaces that are either smooth or elaborately decorated, some with spines or grooves. A few turban snails have umbilical holes and pearly shell openings. Most are found in tropical waters and are particularly fond of residing near coral reefs.

3, field snails

Shell is calcareous, thin, spiral, right-handed. The shell is yellowish green to yellowish brown on the outside, the color varies depending on the environment and water quality, the inner surface is grayish white, the top of the shell is slightly pointed, the bottom of the shell is enlarged, and the mouth of the shell is ovoid, and its edges are intact and angular.

The snail is cold hardy and fear of heat, the optimal growth temperature of 25 ℃, the water temperature is lower than 15 ℃ or higher than 30 ℃ that is to stop feeding, when the water temperature is lower than 10 ℃ will be drilling mud, more than 40 ℃ will be scalded to death. The snails are omnivorous, preferring night activities and feeding, and can reproduce naturally.

4, conch

Mollusca gastropods, mollusks. Shellfish are mainly divided into five syllabus, there are more than 70,000 species around the world, marine species can be commonly known as conch.

The conch shell edge contour slightly quadrangular, large and thick, shell up to about 10 centimeters, the conch layer of 6 levels. It is rich in protein, vitamins and essential amino acids and trace elements, is a typical high protein, low fat, high calcium natural animal food.

5, clams

Shells and other large, triangular ovoid or ovoid, most species vary on both sides. Shell is usually thin, some species of two shells closed, most species of one end of the opening or both ends of the opening, often with shell skin; shell surface smooth or concentric growth lines, the inner edge of the shell flat and sharp.

The top of the shell is mostly prominent and anteriorly inclined. The lunula and the tatrix surfaces are usually clearly demarcated. The margin of the shell top has an outer ligament and another ligamentous groove in which the inner ligament resides. Articulated left shell with a split primary tooth, inverted "v"-shaped, usually fused apically, with the posterior branch of the primary tooth immediately adjacent to a parapleuron; the primary tooth of the right shell usually separated.

6, clams

Shell shape is generally larger, the surface bulging, triangular ovoid, the shell is thick, smooth and delicate surface, there is a layer of brown crust; veins are clear, from the top of the shell there is a jagged brown bands, there is no radial ribs.

The dorsal margin is slightly triangular, the ventral margin is rounded, its shell length is slightly larger than the shell height, the anterior lateral margins are rounded, the posterior lateral margins are rounded at the end, the two shells are equal in size but unequal on both sides, and the shells are asymmetrical before and after. The top of the shell is prominent, located slightly in front of the back, and the tops of the two shells are close together and slightly curved to the ventral surface.

The surface of the shell is covered with a shiny, thin, yellowish-brown crust, which is often abraded in the middle and marginal parts of the shell, making the shell surface white. The concentric growth lines are clear.

Baidu Encyclopedia-Shellfish