page_title: Acoela
hierarchical_section_title: Acoela
caption_attribution_description: English: Acoel flatworm Neochildia fusca.
context_page_description: Acoela, or the acoels, is an order of small and simple invertebrates in the subphylum Acoelomorpha of phylum Xenacoelomorpha, a deep branching bilaterian group of animals, which resemble flatworms. Historically they were treated as an order of turbellarian flatworms.
  The etymology of "acoel" is from the Ancient Greek words ἀ, the alpha privative, expressing negation or absence, and κοιλία, meaning "cavity". This refers to the fact that acoels have a structure lacking a fluid-filled body cavity.
context_section_description: Acoela, or the acoels, is an order of small and simple invertebrates in the subphylum Acoelomorpha of phylum Xenacoelomorpha, a deep branching bilaterian group of animals, which resemble flatworms. Historically they were treated as an order of turbellarian flatworms.
  The etymology of "acoel" is from the Ancient Greek words ἀ (a), the alpha privative, expressing negation or absence, and κοιλία (koilía), meaning "cavity". This refers to the fact that acoels have a structure lacking a fluid-filled body cavity.
caption: Neochildia fusca, a member of Convolutidae (= Anaperidae)
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