Image of Hypsibius arcticus (Murray 1907)
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Hypsibius arcticus (Murray 1907)


provided by NMNH Antarctic Invertebrates

“Hypsibius (Hysibius) arcticus (John Murray, 1907)

(Pl. I, figs. 1-4)

Body transparent, short and thick; legs are fairly short. Cuticula is even. The eye-spots are blackin colour. Stylet is bowed. The mouth-tube 5 µ wide and somewhat broader from the proboscis to the pharynx: the muscle-attaching process of the rostral part is hook-shaped; the pharynx is spherical (50 µ X 50 µ) and provided with a short apophysis and two macroplacoides. The first macroplacoid 3.9 times, the 2nd 2.7 times as long as broad: microplacoid is not provided. The outer claws somewhat longer than the inner onesl the basal claw is robust and curved from its base: the terminal claw long and slender, and the terminal part of the claw strongly bent.

Body length 400 µ, breadth 135 µ. Legs about 38 µ long. The length of buccal apparatus 120 µ (300 ms); pharynx 49 µ long (125 ms), and 49 µ broad (100 cph). The length of macroplacoid: I. 8.9 µ (22.3 cph), II. 6.4 µ (16.0 cph); the breadth of macroplacoid 2.3 µ (5.8 cph). The outher claw of the 4th legs 17 µ long.

The legs laid in the cast-off skin were generally found three by three. The egg shell is about 7.6 µ thick.”

(Morikawa, 1962: 3-4)