Comprehensive Description

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"Cossura alba, new species



Record: 2:3 sta. 208 (1, TYPE).



Description: A small, pale, posteriorly incomplete specimen meas­ures 6 mm long by 1.5 mm wide and consists of 23 anterior segments ; a tail end is lacking. The prostomium is triangular, longer than wide and narrowest in front ; it lacks eyes or other surface marks. The first seg­ment is a complete, smooth ring resembling the second segment but lack­ing setae. The second segment is the first with setae; it has a neuropo­dial fascicle which is smaller than those farther back. The third seg­ment is the first biramous one ; its notopodia are smaller and slenderer than those farther back.


A large, median tentacle is inserted middorsally between setigerous segments four and five, or on the sixth segment ; it is smooth and cvlin­drical.


Notosetae resemble neurosetae; they are arranged in spreading fas­cicles, in anterior and posterior rows, the posterior rows with longer and more numerous setae ; all setae are slender, limbate and smooth along the cutting edge.


Cossura alba differs from C. laeviseta Hartmann-Schroeder, 1962, in having the median tentacle inserted between setigerous segments four and five, instead of on third setiger ; eyes are absent instead of present.



Distribution: Off southwest Chile, in 957 m."



(Hartman, 1967


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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