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Nematòides

Infotaula d'ésser viuNematòides
Nematoida Modifica el valor a Wikidata

Paragordius tricuspidatus Modifica el valor a Wikidata
Taxonomia
Super-regneHolozoa
RegneAnimalia
Cap valorNematoida Modifica el valor a Wikidata
Fílums

Els nematòides (Nematoida) són un clade d'animals ecdisozous. Es tracta cucs cilíndrics llargs i prims, pseudocelomats i no segmentats, aquàtics, per bé que molts són paràsits. Són dioics (amb individus mascles i femelles). Presenten aparell digestiu, però no circulatori ni excretor. Tenen una cutícula de col·lagen que muden regularment i músculs longitudinals, que estan separats per tires d'epidermis, travessades pels nervis. No tenen músculs anulars. Els seus espermatozoides són ameboides i no tenen acrosoma.[1]

Filogènia

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A continuació se mostren les relacions dels nematòides amb altres ecdisozous segons estudis recents que intenten evitar els errors sistemàtics:[2][3][4]

Ecdysozoa
Scalidophora

Loricifera




Priapulida



Kinorhyncha





Nematoida

Nematoda



Nematomorpha



Panarthropoda

Tardigrada




Onychophora



Arthropoda






Referències

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  1. Telford MJ, Bourlat SJ, Economou A, Papillon D, Rota-Stabelli O «The evolution of the Ecdysozoa». Philos. Trans. R. Soc. Lond., B, Biol. Sci., 363, 1496, abril 2008, pàg. 1529–37. DOI: 10.1098/rstb.2007.2243. PMC: 2614232. PMID: 18192181.
  2. Lahcen I. Campbell, Omar Rota-Stabelli, Gregory D. Edgecombe, Trevor Marchioro, Stuart J. Longhorn, Maximilian J. Telford, Hervé Philippe, Lorena Rebecchi, Kevin J. Peterson, and Davide Pisani (2011). MicroRNAs and phylogenomics resolve the relationships of Tardigrada and suggest that velvet worms are the sister group of Arthropoda Arxivat 2020-02-19 a Wayback Machine.. PNAS. https://doi.org/10.1073/pnas.1105499108.
  3. Marlétaz, Ferdinand «Zoology: Worming into the Origin of Bilaterians» (en inglés). Current Biology, vol. 29, 12, 17-06-2019, pàg. R577–R579. DOI: 10.1016/j.cub.2019.05.006. ISSN: 0960-9822. PMID: 31211978.
  4. «Ecdysozoa description». Arxivat de l'original el 2019-12-03. [Consulta: 23 desembre 2020].
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Nematòides
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