Haplodiscus Piger
''Haplodiscus'' is a genus of acoels belonging to the family Convolutidae. Species: *''Haplodiscus acuminatus'' *''Haplodiscus bocki'' *''Haplodiscus incola'' *''Haplodiscus obtusus'' *''Haplodiscus ovatus'' *''Haplodiscus piger'' *''Haplodiscus ussovi'' *''Haplodiscus weldoni'' References

{{Taxonbar, from=Q4991995 Acoelomorphs ...
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Acoels
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 (), the ''alpha privative'', expressing negation or absence, and (), meaning "cavity". This refers to the fact that acoels have a structure lacking a fluid-filled body cavity. Description Acoels are very small flattened worms, usually under in length, but some larger species, such as ''Symsagittifera roscoffensis'', may reach up to . They are bilaterally symmetric and microscopic. They are found worldwide in marine and brackish waters, usually having a benthos, benthic lifestyle, although some species are epibionts. Two species, ''Limonoposthia polonica'' and ''Oligochoerus limnophilus'', lives in freshwater. Members of the class Acoela lack a conventi ...
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