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Characteristics, distribution and ecology
Taxonomische classification
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Fol, 1872

A medium sized appendicularian species. The trunk is elongated and narrow, dorsally slightly concave. Tail with narrow muscular bands and without sub-chordal glands.
A large diverticulum (caecum) extending from the left stomach lobe, obliquely backwards, giving the trunk a characteristic aspect for this species. The intestine and the rectum are elongated. Mouth is turned upwards and has a pronounced lower lip.
The endostyle is short and broad, there are no buccal glands. The ovary is rather flat; the paired testes are long, covering most of the stomach.

Body length 1.0-1.4 mm.

Depth range

Distribution in the North Sea
Occasionally entering the northern North Sea in September (Lohmann, 1901).

World distribution
Semi-cosmopolitan in temperate and tropical waters of the Atlantic, Pacific and Indian Oceans; also in the Red Sea and Mediterranean Sea. In the North Atlantic Ocean occasionally transported with the Gulf Stream up to 60°N. Absent from the Arctic Ocean.

Oikopleura fusiformis