(From: Cantell, C. E. (1993). Praealbonemertes whangateaunienses n. gen. and n. sp., a new heteronemertean from New Zealand.. New Zealand Journal of Zoology. 63-70.)
Margins of the head with a pair of horizontal cephalic slits. A caudal cirrus present. No eyes. Dermal glands situated in the outer half to one-fourth of the zone of the body between the epidermal basal membrane and the circular muscle layer. Dermal glands not separated from the outer tissue. Numerous horizontal and dorsoventral muscle fibres in the region of the cerebral organs. Dorsoventral muscle fibres present between the lateral intestinal diverticula. Foregut and anterior intestine provided with a distinct longitudinal muscle plate. Proboscis containing 3 main muscle layers (outer longitudinal, middle circular, inner longitudinal) and with 2 muscle crossovers. 1-2 pairs of efferent ducts in the excretory system. Where the dorsal ganglia separate from the ventral, they are 2-3 times larger than the latter. Frontal organs 3 ciliated pits.
The worms had a length between 130-335 mm and were 2 mm wide.
The head bears lateral horizontal slits. The worms are coloured white anteriorly and pink to pink-brown posteriorly. One specimen was 130 mm long, of which the white part was about 60 mm. The posterior part can be white also. The colour of the body depends also on the food in the gut. It is equally intense on the dorsal and ventral sides. Anteriorly the cerebral ganglia, tinged a roseate colour, are visible through the body wall. The biggest specimen had green streaks of pigment posteriorly (both dorsally and ventrally).
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