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Ecdysozoa - Wikipedia. Gli Ecdysozoa Aguinaldo et al., 1997 sono uno dei due maggiori cladi degli animali protostomi (con i Lophotrochozoa ). Il clade è supportato e basato su dati molecolari; evidenze molecolari, infatti, risultano dagli studi dell'evoluzione di geni 18S di RNA ribosomale ( rRNA ).
Ecdysozoa (/ ˌ ɛ k d ɪ s oʊ ˈ z oʊ ə /) is a group of protostome animals, including Arthropoda (insects, chelicerata (including arachnids), crustaceans, and myriapods), Nematoda, and several smaller phyla. The grouping of these animal phyla into a single clade was first proposed by Eernisse et al.
Gli artropodi sono un phylum di animali invertebrati protostomi celomati, che comprende circa i 5/6 delle specie finora classificate. Il fatto che siano state descritte oltre un milione di specie di artropodi dimostra come la loro struttura di base sia versatile e adattabile a diversi modi di vita.
Ecdysozoa. Kinorhyncha; Loricifera; Priapulida; Nematoda; Nematomorpha; Lobopodia; Onychophora; Tardigrada; Arthropoda; Spiralia. Chaetognatha; Lophotrochozoa. Sipuncula; Hyolitha; Nemertea; Phoronida; Bryozoa; Entoprocta; Brachiopoda; Mollusca; Annelida; Echiura; Platyzoa. Platyhelminthes; Gastrotricha; Rotifera; Acanthocephala; Gnathostomulida
The fossil record of Ecdysozoa is among the best understood of major animal clades and is believed to document their origins and evolutionary history well. Strikingly, however, molecular clock analyses have implied a considerably deeper Precambrian origin for Ecdysozoa, much older than their earliest fossils.
24 ago 2017 · Ecdysozoa, as understood nowadays (see different configurations in Fig. 1), includes the members of three putative subclades, Nematoida (composed of Nematoda and Nematomorpha), Scalidophora (Priapulida, Loricifera, and Kinorhyncha) and Panarthropoda, the latter being ecdysozoans with paired ventrolateral segmental appendages, i.e., Arthropoda, Onychophora, and Tardigrada .
Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa. Since the cuticle of these animals typically forms a largely inelastic exoskeleton , it is shed during growth and a new, larger covering is formed. [1]
