Homalorhagida
Homalorhagida (phylum Aschelminthes, class Kinorhyncha) An order of worms in which the head is covered on retraction by a series of body plates on the third segment.
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Osteostraci , Osteostraci(Cephalaspida; osteostracans; superclass Agnatha) Order of extinct, fish-like, jawless vertebrates, ranging from the Silurian to the Devon… Cover , cov·er / ˈkəvər/ • v. [tr.] 1. (often be covered) put something such as a cloth or lid on top of or in front of (something) in order to protect or co… Diplostraca , Conchostraca (clam shrimps; class Branchiopoda, order Diplostraca) Suborder of branchiopods called ‘clam shrimps’ because the body is almost or compl… Myriapoda , Myriapoda(phylum Arthropoda) A subphylum of nearly 13 000 species of arthropods that have a head and an elongated body comprising up to nearly 100 se… Heterostraci , Heterostraci (Pteraspida; heterostracans; superclass Agnatha) Oldest known vertebrate order of jawless, heavily armoured fish-like forms, ranging fro… 196. Head , head / hed/ • n. 1. the upper part of the human body, or the front or upper part of the body of an animal, typically separated from the rest of the b…
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Homalorhagida