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Ecdysozoa (/ ˌ ɛ k d ɪ s oʊ ˈ z oʊ ə /) is a group of protostome animals, [8] including Arthropoda (insects, chelicerata (including arachnids), crustaceans, and myriapods), Nematoda, and several smaller phyla.
Protostomia (/ ˌ p r oʊ t ə ˈ s t oʊ m i. ə /) is the clade of animals once thought to be characterized by the formation of the organism's mouth before its anus during embryonic development.
Uncus dzaugisi is an extinct species of animal which lived approximately 560 to 550 Ma ago during the late Ediacaran of Southern Australia.Its morphology suggests that it was a member of Ecdysozoa, which would make it the oldest member of the clade known so far, [1] as well as one of the oldest known bilaterians.
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Adult Rhopalomyia solidaginis fly, emerging from pupal case Process of ecdysis of a cicada.. Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa.
Its appearance is a matter of debate, for no representative has been (or may or may not ever be) identified in the fossil record.Two reconstructed urbilaterian morphologies can be considered: first, the less complex ancestral form forming the common ancestor to Xenacoelomorpha and Nephrozoa; and second, the more complex urbilaterian ancestral to both protostomes and deuterostomes, sometimes ...
The Spiralia are a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa. [4] The term Spiralia is applied to those phyla that exhibit canonical spiral cleavage, a pattern of early development found in most members of the Lophotrochozoa.
Lingula is a genus of brachiopods within the class Lingulata. Lingula or forms very close in appearance have existed possibly since the Cambrian.Like its relatives, it has two unadorned organo-phosphatic valves and a long fleshy stalk.