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Comprehensive Description

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Description

Ophiocten hastatum sp. nov.

 

Plate V. Figs. 133, 134.

 

Special Marks. —Disk with minute thin scales, among which appear well-marked priplary plates. Three tapering arm-spines, the upper much the longest and largest. One minute tentacle-scale.

 

Description of an Individual (Station 146.) — Diameter of disk 9 mm. Width of arm close to disk 2 mm. Four or five short, squarish, close-set mouth-papillæ on each side, with one much larger at apex of jaw, having two small bead-like ones at its base. Mouth-shield rounded pentagonal, having a broad angle within. Side mouth-shields long and narrow, of about equal width, nearly or quite meeting within. First under arm-plate larger than any of the others, four-sided, with inner side much narrower than the outer, which is slightly rounded; the remainder of the under arm-plates are much wider than long, and nearly semicircular, with a slight peak inward, and outer side deeply curved. Side arm-plates somewhat swollen and flaring outward, meet­ing broadly below; separated above by the upper arm-plates, which are some­what arched, with the inner side narrower than the outer, which is curved. Disk round, smooth, and flat, covered, above and below, with minute thin scales; in the centre are several rounded primary plates, and one of nearly equal size in each interbrachial space. Radial shields pear-seed shape, with inner angle blunt, and outer corners rounded; separated their entire length by fine over­lapping scales. Genital scales hidden, except their tips, outside the radial shields, which bear an arm-comb of a few minute papillæ, as does sometimes the first upper arm-plate. Three slender, cylindrical, tapering, pointed. arm-spines, the upper one being much longer and larger than the two lower; lengths to that of an arm-joint 3.4, 1, .8: 1. Tentacle-scales minute and rounded; there are two or three to each of the second mouth-tentacles; usually one on the outside of the basal pores, and one on the inside of the pores farther out on the arm. Color in alcohol, disk nearly white; arms above pale gray.

 

Station 78, 1000 fathoms, 2 specimens. Station 146, 1375 fathoms, 12 + specimens. Station 168, 1100 fathoms, 12 + specimens.”

 

(Lyman, 1878; 103)

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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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