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Neodermata

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Clade of flatworms

Neodermata
Fasciola hepatica, a neodermatan
Fasciola hepatica, a neodermatan
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Platyhelminthes
Subphylum: Rhabditophora
Superclass: Neodermata
Ehlers, 1985
Orders

Neodermata is a clade of rhabditophoran flatworms containing the parasitic groups Trematoda, Monogenea and Cestoda.

Description

All neodermatans are parasites, in many groups having a free-swimming larval stage. The most striking feature uniting all neodermatans is that the ciliated epidermis (typical of most flatworms) is cast off in adult worms, being replaced by a syncytium called tegument or neodermis. Other characters found in all neodermatans are related to the anatomy of the protonephridium and the rootlets of epidermal locomotory cilia.

Phylogeny

Currently, the monophyly of Neodermata is undisputed, being supported by both morphological and molecular data. It is clear that they evolved from free-living flatworms (turbellarians), but their sister-group was for a long time a matter of debate. The first attempts to reconstruct the phylogeny of flatworms, based on morphological evidence, considered Rhabdocoela to be the sister-group of Neodermata, but this was based on weak morphological similarities and was not supported by molecular studies.

The most recent evidences put the order Bothrioplanida as the sister-group of Neodermata, uniting them in a clade called Bothrioneodermata.

References

  1. Ehlers, Ulrich (1985). Das phylogenetische System der Plathelminthes (in German). Stuttgart ; New York: G. Fischer. ISBN 978-3-437-30499-6.
  2. Rohde, K. (1990). "Phylogeny of platyhelminthes, with special reference to parasitic groups". International Journal for Parasitology. 20 (8): 979–1007. doi:10.1016/0020-7519(90)90041-K. ISSN 0020-7519. PMID 2074143.
  3. Littlewood, D. T. J.; Rohde, K.; Bray, R. A.; Herniou, E. A. (1999). "Phylogeny of the Platyhelminthes and the evolution of parasitism". Biological Journal of the Linnean Society. 68 (1–2): 257–287. doi:10.1111/j.1095-8312.1999.tb01169.x. ISSN 0024-4066.
  4. ^ Egger, B.; Lapraz, F.; Tomiczek, B.; Müller, S.; Dessimoz, C.; Girstmair, J.; Škunca, N.; Rawlinson, K. A.; Cameron, C. B.; Beli, E.; Todaro, M. A.; Gammoudi, M.; Norẽna, C.; Telford, M. (2015). "A transcriptomic-phylogenomic analysis of the evolutionary relationships of flatworms". Current Biology. 25 (10): 1347–1353. doi:10.1016/j.cub.2015.03.034. PMC 4446793. PMID 25866392.
Taxon identifiers
Neodermata
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