Comprehensive Description

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External Appearance

A very large species, extremely long and slender. General body color is deep brown varying to grey-black with the posterior fading to a lighter yellowish brown color. The color pattern consists of a series of three fine longitudinal lines and transverse white bands. The longitudinal lines are parallel (one mid-dorsal and the others lateral). The mid-dorsal line is unbroken and extends from the tip of the head to the posterior. The lateral lines are broken and become less distinct in the posterior. Transverse bands completely encircle the body (with the exception of the most anterior one). The first transverse band appears as a sharp v-shaped marking with an angle directed backward. The mid-dorsal line passes through the angle of the v-shaped marking, and the point of the intersection of the white area is somewhat enlarged to form a small oval spot. The second transverse band is 20-30mm from the first band and is more conspicuous than the first. The diameter in the esophageal region is twice as great as it is farther back. The body is strongly rounded on the dorsal surface throughout its whole length; the posterior end is very slender and easily broken. The head is rounded, wider than the body, and dorso-ventrally flattened. The head is sharply demarcated from the body by a pair of deep lateral transverse constrictions (furrows). The proboscis pore is small, subterminal and bounded on each side by a shallow horizontal groove. The mouth is small and slightly elongated situated immediately behind the lateral furrows.


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

© Ritger, Rebecca

Source: Nemertea

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