page_title: Acoelomorpha
section_title: Classification
hierarchical_section_title: Acoelomorpha / Systematics / Classification
caption_attribution_description: English: Morphological variation within the genera Nemertinoides and Sterreria. Light microscope photographs of live specimens in squeeze preparation a – Sterreria rubra from Southern Portugal, b – S. psammicola from Southern Portugal, c – S. martindalei n.sp. from Waimanolo, Hawaii, d – S. ylvae n.sp, from Waimanolo, Hawaii, e – S. variabilis n.sp. from New Caledonia, f – S. variabilis n.sp. from Bermuda, g – Nemertinoides elongatus from Southern Portugal, h) S. rubra from Helgoland, North Sea, i – N. glandulosum n.sp. from Southern Portugal, j – N. wolfgangi n.sp. from Croatia.
context_page_description: Acoelomorpha is a subphylum of very simple and small soft-bodied animals with planula-like features which live in marine or brackish waters. They usually live between grains of sediment, swimming as plankton, or crawling on other organisms, such as algae and corals. With the exception of two acoel freshwater species, all known Acoelomorphs are marine.
context_section_description: The subphylum Acoelomorpha is divided into two classes.
  Acoela comprise small flattened worms, classified into a dozen of families.
  Nemertodermatida comprise millimetre-sized, mostly interstitial worms, distributed into two families.
caption: Various members of the Nemertodermatida class.
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