Flatworm
Videos
Platyhelminthes is a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates commonly called flatworms or flat worms. Being acoelomates, and having no specialised circulatory an
Various parasitic flatworms from Haeckel's Kunstformen der Natur (1904)
The turbellarian Pseudoceros dimidiatus
Life cycle of the eucestode Taenia: Inset 5 shows the scolex, which has four Taenia solium, a disk with hooks on the end. Inset 6 shows the tapeworm's whole body, in which the scolex is the tiny, round tip in the top left corner, and a mature proglottid has just detached.
Nemertea
Videos
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.