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Krøyer, 1844

Body somewhat thickset, with rather thick and not widely separated lateral processes. Cephalon very large, as long as the three following segments together, neck short, frontal part greatly expanded. Abdomen comparatively small and cylindrical.
Ocular tubercle very low and rounded at the top. Proboscis as long as the cephalon. Chelifores well developed; scape somewhat swollen at the tip; hand very large, longer than the scape, almost bare, arcuate; fingers elongated, as long as the palm, both incurved and with sharply pointed tips; teeth on the inner margin of the immobile finger larger and less numerous than on the mobile finger. Palps slender, twice as long as the proboscis; 2nd segment longer than the 3rd one, the two outer segments very slim and elongated, last segment the shortest.
Ovigerous legs with ten segments present in both sexes; longer than the body length; 4th and 5th segments equal in length, terminal part longer than the 5th segment, marginal spines stout, triangular acuminated, with more or less serrated edges.
Ambulatory legs slender, about five times as long as the body and nearly bare; tibia 2 almost twice as long as the femur and four times longer than the terminal section; tarsus linear; propodus considerably shorter, with minute spines on the inner edge; terminal claw short and thick, hardly half as long as the propodus; auxiliary claws one-third the length of the terminal claw.
Colour reddish-yellow. Length of the body up to 15 mm; the extent between the points of the ambulatory legs reaching 150 mm.

Sublittoral, down to 90 m.

Norway, Britain and the east coast of North America.

Nymphon stroemi