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Taxonomische classification
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Lohmann, 1896

A small species, with an allongated but small trunk compared to the very long and broad tail. The tail is weak because the broad chordal muscles are poorly developed; at the left distal part are four fusiform sub-chordal glands in one line.
In mature specimens, the ovary and the two lateral testes form a round mass restricted in the genital part, giving a characteristic aspect to the trunk.
The mouth has a short lower lip. The endostyle is short and narrow, situated about half way the mouth and anus. There are two voluminous and rounded buccal glands. The left lobe of the stomach is rounded, with a very small post cardial caecum, appearing reniform.

Trunk length 0.8 mm, tail 2.0 mm.

Depth range
Preferably from 100 to >650 m, rare in the surface layers.

Distribution in the North Sea
Northern North Sea.

World distribution
Semi-cosmopolitan in cold and warm waters of the North and South Atlantic and Pacific Oceans. Also in the Mediterranean Sea. In the NE Atlantic as north of 81°N (north of Spitzbergen).

Oikopleura parva