Macrostomorpha
| Macrostomorpha | |
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| Macrostomum lignano | |
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Macrostomorpha
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Macrostomorpha is a clade of free living microturbellarians 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 exlusively 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.
References
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