Comprehensive Description

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External Appearance

(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)

In June, at the time the specimens were collected, the sexual products were fully mature, and the species showed marked sexual color varieties. The prevailing color of the females was yellowish orange both above and below, but except in the esophageal region, this color was to a great extent obscured by the dark olive green color of the mature ova. These ova in large pouches on each side of the body, and each pouch with its contents appeared as a dark green spot. In many cases several adjacent pouches lie nearly in contact, giving the external appearance of dark gene blotches. Seen directly from the dorsal surface the green spots appear on each side in more or less regular pairs, those of the two sides being separated by an interrupted, narrow, longitudinal, median band of yellow. From the sides the ovaries appear as irregular transverse stripes of dark green alternating with the yellow color of the body--hence the specific name, tigrinius. The males are much less deeply colored. They are pale yellowish with the slight tinge of green, and the spermaries appear as innumerable cream-colored specks. Both males and females have a narrow, longitudinal, median band of brownish on the anterior dorsal portion of the body. After preservation in alcohol both sexes assume a greenish color, which is retained even after mounting in balsam.

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© Ritger, Rebecca

Source: Nemertea

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