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Challengeron channeri (Murray, 1885)

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Challengeron channeri:
Shell subcircular, lenticular, strongly compressed, with fourteen to eighteen slender, straight radial spines on the margin; the spines are straight, equidistant, cylindrical, and about as long as the radius of the shell. Peristome short, with two parallel, vertical, lateral, straight teeth, which are less than half the length of a spine.

Dimensions: Diameter of the shell 0.14 to 0.17, length of the spines 0.06 to 0.08.
Habitat: North Pacific, Station 231, depth 2250 fathoms.
Haeckel 1887
Challengeron channeri:
I have only seen one individual which I have supposed to belong to this species. Its shell was circular in outline, strongly compressed, with 16 marginal spines, all more or less broken off. Also the teeth of the peristome were broken of.

Diameter, 165 µ.

In the sea 40 miles NW of Gaukværø, 19/1 1899, 0-700 m.

Distribution: In the sea south west of the Faeroe Isles, and the southern parts of the Atlantic (Borgert 1. C). On the American side of the Atlantic (48° N, 42° W according to Cleve L. 40, p. 147, very rare). The Northern Pacific, at a great depth (Haeckel 1. C).
Jørgensen 1905











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