Comprehensive Description

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Description

Amphiura dalea sp. nov.

 

Plate XII. Figs. 320 -322.

 

Special Marks. — Four mouth-papillae on a side. Three arm-spines, the middle one swollen. One tentacle-scale. Disk-scales fine, only the central primary plate being conspicuous. First under arm-plate small.

 

Description of an Individual (Station 325). — Diameter of disk 9 mm. Width of arm close to disk, without spines, 1.3 mm. Three stout, close-set papillae on either side of the mouth-angle, and two large and much rounded at the apex; of those on the sides the outermost is largest. Mouth-shields small, triangular, a little longer than wide, rounded on all sides except within, where is a point. Side mouth-shields large, broad without, tapering inward where they just meet. First under arm-plate very small ; those beyond are broader than long, angular, and with re-entering curves on the sides where are the ten­tacle-pores ; still farther out they are triangular, with outer edge much curved, and a truncated angle within. Side arm-plates short, not much projecting, meet­ing above beyond the first upper arm-plate, and below beyond the seventh or eighth. Upper arm-plates slightly swollen, very short and wide, of a trans­verse oval shape, and with a small longitudinal ridge. Disk flat and tolerably thick, covered with thin, small, flat, overlapping scales, with one somewhat larger rounded primary in the centre; about 4 scales in the length of 1 mm. Radial shields long and broad, bluntly pointed within, nearly or quite sepa­rated their entire length by a narrow wedge of scales. On the interbrachial spaces on the under surface the scaling is much finer than that above, there being about 15 in the length of 1 mm. Three tapering, rather sharp arm-spines, the upper one being shorter than the other two, and the middle one much the stoutest, and swollen. One small longer than broad tentacle-scale on the brachial side of the tentacle-pore ; a little way out on the arm there usually is no tentacle-scale. Color in alcohol, pale straw.

 

Station 325, 2,650 fathoms, 5 specimens.”

 

(Lyman, 1879; 27-28)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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