Larvae and adults transparent; pelagic (adults may be solitary or colonial). They tend to be planktonic but are generally capable of weak movements. Remarkable life cycles are characteristic of this group, with sexual and asexual reproductive stages occurring.
Order PYROSOMIDA. Marine seas except the Arctic. Tubular colonies with a common atrial chamber. They can emit a strong phosphorescent light. The colonies usually vary in length from about 3 cm to 1 m.
Order DOLIOLIDA (Cyclomyaria). Marine; primarily tropical to temperate. Generally barrel-shaped with eight or nine muscle bands around the body.
Order SALPIDA (Hemimyaria). Marine, all seas. Cylindrical or prism-shaped.
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