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Protocystis tridens (Haeckel, 1887)

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Challengeria tridens:
Shell subspherical, slightly compressed. Peristome about as long as the radius of the shell, with three diverging and obliquely descending teeth; the dorsal odd tooth odd twice as long as the paired lateral teeth.

Dimensions: Diameter of the shell 0.08 to 0.12, length of the peristome 0.05 to 0.07.
Habitat: North Atlantic, Færöe Channel (Gulf stream), John Murray.
(Haeckel) 1887
Protocystis tridens:
Frequent, though never numerous, as a rule only in deep water, up to 50 m.

Distribution: Frequent on the west coast of Norway, in August 1903 in large numbers in deep water off the coast of Bergen (L. 18, 1903-1904, nr. 1).

Also found many places in the North Sea and the northern part of the Gulf Stream, as far as south and west of Spitzbergen. According to BORGERT 1 C [1901] also known from the East and the West Greenland Current and the Labrador Current. Probably a northern temperate oceanic form.
Jørgensen 1905


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