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Sea Squirts: Ascidiacea - Physical Characteristics, Behavior And Reproduction, No Common Name (distaplia Cylindrica): Species Accounts, No Common Name (botryllus Schlosseri): Species Accounts - GEOGRAPHIC RANGE, HABITAT, DIET, SEA SQUIRTS AND PEOPLE, CONS

live water eat plankton

NO COMMON NAME (Distaplia cylindrica): SPECIES ACCOUNTS
NO COMMON NAME (Botryllus schlosseri): SPECIES ACCOUNTS
NO COMMON NAME (Didemnum studeri): SPECIES ACCOUNTS

Sea squirts live in all oceans and seas.


Sea squirts live at all depths. Most live in shallow water. Some even survive on open shores under strong wave action. Some sea squirts live in ocean trenches as deep as 28,000 feet (8,400 meters). Most species of sea squirts live on rocks, shells, or algae (AL-jee), which are plantlike growths that live in water and have no true roots, stems, or leaves. Some sea squirts live on soft muddy or sandy bottoms. A few species of sea squirts live between gravel grains.

Sea squirts eat bacteria, plankton, and small swimming invertebrates. Plankton is microscopic plants and animals drifting in the water. Invertebrates (in-VER-teh-brehts) are animals without a backbone.


Sea squirts may be a source for chemicals used to make medicines. In some countries, people eat sea squirts. Sea squirts that grow on the bottoms of ships interfere with mussel and oyster farming.

The Philosopher and the Sea Squirts

The Greek philosopher Aristotle studied sea squirts more than 2,300 years ago.

Sea squirts are not considered threatened or endangered.

Additional Topics

Sea Squirts: Ascidiacea - Physical Characteristics

Some sea squirts look like large, upright tubes and live alone. Others live in colonies and form a crust on rocks and other hard surfaces. Both types of sea squirts have a protective body covering. This layer is clear or brightly colored, usually red, brown, or yellow but sometimes blue. In some species the body covering is coated with spines. Most sea squirts are 0.04 to 6 inches (1 millimeter to…

Sea Squirts: Ascidiacea - Behavior And Reproduction

Most sea squirts firmly attach themselves to the material on which they live. Species that are not firmly attached have threads on their body covering for anchoring themselves. The species that live between grains of gravel are not fixed and can move. Sea squirts use muscle contractions to draw in seawater and to pump it out, opening and closing their intake and exit holes as they do so. For most …

Sea Squirts: Ascidiacea - No Common Name (distaplia Cylindrica): Species Accounts

Physical characteristics: Distaplia cylindrica sea squirts form sausage-shaped colonies that reach a length of 23 feet (7 meters) and a width of 3 inches (8 centimeters). The colony is white or yellowish and has a soft texture. It is attached at one end to rocks and grows upward. The individual sea squirts in the colony are small and are located only in the surface layer of the colony, where they …

Sea Squirts: Ascidiacea - No Common Name (botryllus Schlosseri): Species Accounts

Physical characteristics: Botryllus schlosseri sea squirts live in flat colonies on rocks or algae. The colonies reach a width of about 4 inches (10 centimeters). Systems of individual sea squirts are embedded in a soft, slimy dark brown sheet in circular patterns that look like daisies. The system's common opening looks like the center of the flower. The individual sea squirts have a white…

Sea Squirts: Ascidiacea - No Common Name (didemnum Studeri): Species Accounts

Physical characteristics: Didemnum studeri sea squirts form flat colonies on rocks. The colonies are 3 feet (1 meter) or more in diameter and are less than 0.2 inches (5 millimeters) thick. The colony is white and covered with tiny pieces of a material that looks like bone. Geographic range: Didemnum studeri (abbreviated to D. studeri) sea squirts live in the waters just north of the Antarctic reg…

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over 1 year ago

What encylopedias/ sources did this come from? My 3rd graders are using it for a report and I'm trying to help them differentiate between a source that can be substantiated and one that is more vague.

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almost 2 years ago

I'm trying to locate a simple map of the Sea Squirts habitat.
Please assist. Thank You