Parenchymia

Parenchymia is a proposed clade encompassing Nemertea and Platyhelminthes. The clade was suggested in a 2019 study showing the clade as a sister to Annelida and Lophophorata. The synapomorphies include similar organization of ciliary bands in the larva of both groups, as well as a lack of chitin, and is named for the abundant parenchyma found between the body wall and internal organs of both.[1] A similar taxon, with Mollusca being likewise linked together with Symbion and Entoprocta, has been proposed in a clade called Tetraneuralia. [2]

References

"A New Spiralian Phylogeny Places the Enigmatic Arrow Worms among Gnathiferans". Current Biology. 29 (2): 312–318.e3. 2019-01-21. doi:10.1016/j.cub.2018.11.042. ISSN 0960-9822. Retrieved 2022-02-10.
Bleidorn, Christoph (2019-08-22). "Recent progress in reconstructing lophotrochozoan (spiralian) phylogeny". Organisms Diversity & Evolution. Springer Science and Business Media LLC. 19 (4): 557–566. doi:10.1007/s13127-019-00412-4. ISSN 1439-6092.

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[Current_Biology_2019_pp._312–318.e3-1] "A New Spiralian Phylogeny Places the Enigmatic Arrow Worms among Gnathiferans". Current Biology. 29 (2): 312–318.e3. 2019-01-21. doi:10.1016/j.cub.2018.11.042. ISSN 0960-9822. Retrieved 2022-02-10.

[Bleidorn_pp._557–566-2] Bleidorn, Christoph (2019-08-22). "Recent progress in reconstructing lophotrochozoan (spiralian) phylogeny". Organisms Diversity & Evolution. Springer Science and Business Media LLC. 19 (4): 557–566. doi:10.1007/s13127-019-00412-4. ISSN 1439-6092.