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(Sars, 1884)

Description:
Coxal plate 2 broad, especially in male. Epimeral plate 3 posterodistal angle quadrate.
Head, lateral lobes truncated, angular; eyes moderately large, rounded-oval. Antenna 1 about half body length, weakly setose, peduncle articles 2 and 3 subequal length, much longer than article 1, flagellum short, about 5-articulate; accessory flagellum small. Antenna 2 little longer than 1 and more robust, peduncle articles 4 and 5 subequal, flagellum 4 or 5-articulate, weakly setose. Gnathopod 1 propodus oval, palm oblique, straight, delimited by 2-3 small spines. Female gnathopod 2 propodus elongate oval, palm deeply concave with irregular distal process, delimited by obtuse angle and 1-2 small spines. Male gnathopod 2 propodus very large and robust, palmar development variable, in small male palm with triangular median process and delimited by small simple process; in larger male proximal palmar process longer, rectangular with weakly bibbed apex; in very large male propodus very slender with broad proximal process and distinctly bilobed apex. Pereopods 3-7 slender, weakly setose. Uropod 3 inner ramus straight, outer ramus with small apical hook and 1-2 reverted denticles.

Size:
Up to 5 mm.

Colour:
Variegated with brown.

Habitat:
Depth range from 20 to 200 metres, often associated with hydroid growths or amongst sponges, also from carapace of spider crabs.

Distribution:
North East Atlantic; North Sea; European coasts from northern Norway to west coast of France. Not widely recorded.

Jassa pusilla