Macrostomorpha

Macrostomorpha

Macrostomorpha

Clade of flatworms

Macrostomorpha is a clade of free living flatworms ranked either as class or subclass in the group Rhabditophora. There are about 260 described species in two orders - marine, freshwater and brackish Macrostomida, which group most of the species diversity, and exclusively marine Haplopharyngida with only three described species.[1] Macrostomorpha constitute a basal group in Rhabditophora, showing such plesiomorphic condition as entolecithal eggs and spiral cleavage.[2] Another trait found among members of the clade is presence of hard stylet in the male copulatory organ.

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References

  1. [1]
    "World Register of Marine Species". 29 April 2016.
  2. [2]
    Egger, Bernhard; et al. (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.


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