Monostilifera
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Monostilifera is a suborder of nemertean worms belonging to the class Hoplonemertea, a class of worms characterized by the presence of a peculiar armature of spines or plates in their proboscis.
Terrestrial ribbon worm
Egg case of Argonemertes australiensis
Nemertea
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Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of about 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a
Gorgonorhynchus repens, a species within class Anopla, discharges a sticky branched proboscis.
Stylet-containing part of proboscis of "armed" nemertean Amphiporus ochraceus.
Brain and neural cords of hoplonemertean Amphiporus ochraceus. Several clusters of dark eyespots and the opening of one cerebral organ are also visible.