Nematoida is a clade of pseudocoelomate free living or parasitic animals. It consists of phyla Nematoda and Nematomorpha. The two groups share a number of features in common; the presence of a cloaca
Nematomorpha are a phylum of parasitoid animals similar to yet distinct from nematode worms in morphology, hence the name. Most species range in size from 5 to 10 centimetres, reaching 2 metres in ext
Spinochordodes tellinii and its Meconema host
Mermithid worm (Phylum Nematoda), often confused with horsehair worms (Phylum Nematomorpha). Dark structures are eggs, not seen in horsehair worms. Germany 2021.