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Comprehensive Description

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Description

Asychis amphiglypta (Ehlers) (Fig. 31).
Maldane amphiglypta, Ehlers, 1897, p. 119, pl. viii, figs. 187-193.
Asychis amphiglypta, Arwidsson, 191 1, p. 35, pl. i, figs. 27-31; pl. ii, figs. 55-58. Monro, 1930, p. 172.

Occurrence. St. 30 (4); WS 777 (5).

 

Specific characters. Up to about 230 mm. in length. The head is very oblique. Border of cephalic plate divided into three lobes by two profound lateral notches. Hinder border smooth. Nuchal organs long, shaped like a fishhook. There are 19 chaetigers: the buccal and anal segments alone are achaetous. There are no hooks in the first chaetiger. Dorsal bristles of three kinds: (1) stout, narrowly bordered bristles with long, slender, barbed tips ; (2) short bristles with broad wings and delicate smooth tips; (3) fine barbed capillary bristles. The ventral hooks have strong subrostral barbules, a row of four parallel teeth, two large and two small above the main fang, and above these a number of denticles.

 

The anal plate is very oblique. Ventrally it forms a deep hood or pouch separated by profound lateral incisions from the more dorsal part of the plate. Just above the lateral notches the border forms a pair of lobes which in some of these specimens are pinched out in the middle into a pair of small cirri; and again the border at its most dorsal and terminal point usually forms a small peak which in some specimens narrows down to a small cirrus. In fact there may or may not be three small cirri, a pair of lateral and a terminal cirrus, arising from the border of the anal plate (Fig. 31).”

 

(Monro, 1936)

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© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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