Acotylea

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title: "Acotylea" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["turbellaria"] description: "Suborder of flatworms" topic_path: "general/turbellaria" source: "https://en.wikipedia.org/wiki/Acotylea" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Suborder of flatworms ::

| image = | border = infobox | image1 = Stylochus sp. 1 (ou S. stellatus).jpg | image2 = Callioplana marginata.JPG | image3 = Paraplanocera marginata.jpg | image4 = Leptoplanoidea (Leptoplanoidae possible).jpg | image5 = Euplana gracilis SERC 07-31-14 (14823357753).jpg | image6 = Chimaeriplana japonica (10.12782-specdiv.28.255) Figure 1 (cropped).png | image_caption = From the left to right of each row, from top to bottom: Stylochus stellatus, Callioplana marginata, and Paraplanocera marginata (Stylochoidea); Leptoplanoidea indet., Euplana gracilis, and Chimaeriplana japonica (Leptoplanoidea) | taxon = Acotylea | authority = Lang, 1884 | synonyms = * Acotylina Pearse, 1936

Acotylea is a suborder of free-living marine turbellarian flatworms in the order Polycladida.

Description

As currently defined, Acotylea includes polyclads with a Lang's vesicle in the female reproductive system and the male copulatory apparatus directed backwards. When tentacles are present, they are nuchal. The eyespot groups can be nuchal, cerebral, and marginal.

Taxonomy

The internal classification of Acotylea has been unstable, with some genera and families constantly changing place as new molecular and morphological data are analyzed. The current classification is presented below:

• Superfamily Discoceloidea Laidaw, 1903

  • Family Discocelidae Laidlaw, 1903
  • Family Ilyplanidae Faubel, 1983
  • Family Cryptocelidae Laidlaw, 1903
  • Family Polyposthiidae Bergendal, 1893

• Superfamily Leptoplanoidea Faubel, 1984

  • Family Candimboididae Faubel, 1983
  • Family Euplanidae Marcus & Marcus, 1966
  • Family Faubelidae Ozdikmen, 2010
  • Family Gnesiocerotidae Marcus and Marcus, 1966
  • Family Leptoplanidae Stimpson, 1857
  • Family Mucroplanidae Faubel, 1983
  • Family Notocomplanidae Litvaitis, Bolaños & Quiroga, 2019
  • Family Notoplanidae Marcus and Marcus, 1966
  • Family Palauidae Faubel, 1983
  • Family Pleioplanidae Faubel, 1983
  • Family Pseudostylochidae Faubel, 1983
  • Family Stylochoplanidae Meixner, 1907

• Superfamily Stylochoidea Stimpson, 1857

  • Family Callioplanidae Hyman, 1953
  • Family Discoprosthididae Faubel, 1983
  • Family Hoploplanidae Stummer-Traunfels, 1933
  • Family Idioplanidae Dittmann, Cuadrado, Aguado, Noreña & Egger, 2019
  • Family Latocestidae Laidlaw, 1903
  • Family Planoceridae Lang, 1884
  • Family Plehniidae Bock, 1913
  • Family Stylochidae Stimpson, 1857

• Not placed in any Superfamily

  • Family Anocellidae Quiroga, Bolanos & Litvaitis, 2006
  • Family Apidioplanidae Bock, 1926
  • Family Didangiidae Faubel, 1983
  • Family Enantiidae Graff, 1889
  • Family Limnostylochidae Faubel, 1983
  • Family Stylochocestidae Bock, 1913

References

References

1. (2017). "Polycladida phylogeny and evolution: Integrating evidence from 28S rDNA and morphology". Organisms Diversity & Evolution.
2. (2019). "Polyclad phylogeny persists to be problematic". Organisms Diversity & Evolution.
3. (2020). "Molecular Phylogenetic Analysis of Acotylea (Platyhelminthes: Polycladida)". Zoological Science.
4. (2023). "A phylogenomic approach to resolving interrelationships of polyclad flatworms, with implications for life-history evolution". Royal Society Open Science.

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