(from Gibson, R., Wickham D. E., & Kuris A. M. (1990). A new genus and species of monostiliferoidean nemertean (Nemertea: Enopla) found on an egg mass of the anomuran decapod Paralithodes camtschatica.. Zool. J. Linn. Soc.. 185-198.)

Monostiliferoidean enoplan nemerteans; rhynchocoel reaching almost to posterior end of body and with wall containing two distinct muscle layers; proboscis well developed, anterior chamber with two muscle layers (outer circular, inner longitudinal), armature comprising single central stylet and two rudimentary accessory stylet pouches; body wall musculature strongly developed, without diagonal layer but with longitudinal muscle layer divided anteriorly; pre-cerebral septum absent, cephalic retractor muscles derived from inner layer of longitudinal musculature; foregut divisible into oesophagus, stomach and pylorus, intestinal caecum short and with neither anterior pouches nor lateral diverticula, main intestinal canal with deeply lobed lateral diverticula; blood system simple, consisting of cephalic loop, single mid-dorsal vessel and paired lateral vessels, dorsal vessel with single vascular plug, longitudinal vessels not joined by pseudometameric transverse connectives; cerebral ganglia moderately well developed, with neither inner neurilemma nor neurochord cells; lateral nerve cords with myofibrillae but no accessory nerves; peripheral nervous system well developed in foregut region of body, consisting of main pair of longitudinal nerves located laterally immediately below body wall circular muscle layer and network of neurofibrils extending between inner and outer longitudinal muscle layers; frontal organ present, cephalic glands abundantly developed but not extending behind brain; parenchyma unusually extensive; eyes two, positioned near extreme tip of head; cerebral sensory organs rather small, simple, opening from pair of short shallow lateral furrows on anterior third of head; excretory system indistinct; sexes probably separate, males with large numbers of testes but without Takakura’s duct.