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(Sars, 1888)

Body slender, trunk nearly cylindrical, short and finely hirsute above, with the lateral processes well separated. Cephalon scarcely longer than the two following segments together; neck short, frontal part successively expanded. Abdomen simple-cylindrical, obtusely rounded at the tip.
Ocular tubercle obtuse-conic, pointed straight upwards, with comparatively large eyes. Proboscis somewhat shorter than the cephalon, horizontal, slightly tapering. Chelifores large and densely setous; scape narrow cylindrical, somewhat thicker at the tip; hand shorter than the scape, slightly compressed; palm successively expanded towards the tip and of about the length of the fingers, the latter strongly curved at the tips, teeth on the inner edge long and thin. Palps rather elongated, 2nd and 3rd segments about equal in length; the last segment scarcely shorter than the penultimate one, and both together equalling the length of the 3rd segment.
Ovigerous legs with ten segments present in both sexes; in male rather slender, 5th segment successively expanded towards the extremity, and short-hairy there; marginal spines comparatively small, obtusely lanceolate, irregularly crenulated on the edges.
Ambulatory legs about three times as long as the body, rather slender and densely setous; femur in male with only three nodules on the inner edge; terminal part very narrow; tarsus linear; propodus less than twice its length, with numerous long and slender spines on the inner edge; terminal claw about half as long as the propodus; auxiliary claws well developed.
Length of the body up to 6.5 mm; the extent between the points of the ambulatory legs reaching 34 mm.


An arctic species, it sometimes reaches the northern parts of the British Isles and Norway.

Nymphon tenellum