Comprehensive DescriptionRead full entry
"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."