Acotylea

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

Acotylea
Stylochus pilidium (Goette, 1881)
Scientific classification
Kingdom:	Animalia
Phylum:	Platyhelminthes
Order:	Polycladida
Suborder:	Acotylea Lang, 1884
Synonyms
Acotylina Pearse, 1936

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.^[1]

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:^[2][3][4]

• 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

See also

• Kaburakia excelsa