Ramphogordius sanguineus is a moderately-sized free-living nemertean worm that can reach up to 20 cm in length and 3 mm in width. Like all ribbon worms, it is an unsegmented, bilaterally symmetrical ciliated worm with a separate mouth and anus. Ramphogordius sanguineus has longitudinal grooves on opposite sides of its head with four to six eyes on each side and a distinct mouth. When irritated it contracts into tight coils. It has varied but uniform colouring.Ramphogordius sanguineus can be differentiated from similar species such as Lineus rubens by having its eyes arranged more regularly and further back.
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