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  • Urochordata - Encyclopedia. com
    Urochordata (sea squirts, tunicates; phylum Chordata) A subphylum that has a reliable fossil record from the Permian, and possible remains in Silurian sediments Urochordates have tadpole-like larvae with notochords in their tails and a dorsal, tubular nerve cord, features that link them with the Chordata The adults have a gelatinous or leathery protective test (the tunic) made from a
  • Chordata | Encyclopedia. com
    Chordata Chordata is a large and diverse group of animals, with roughly 50,000 living species included The majority of chordates belong to a group called Vertebrata Vertebrates have backbones that are composed of vertebrae Some examples of vertebrates are sharks, fish, dinosaurs, and human beings A second group of chordates, called Urochordata, consists of animals found mostly in oceans
  • Chordates - Encyclopedia. com
    Chordates Chordates are a diverse group of animals that comprise the phylum Chordata The phylum is divided into three subphyla based on general physical characteristics: Urochordata, Cephalochordata, and Vertebrata Urochordates have a notochord (a hollow dorsal nerve cord) while in the larvae stage but lose it later in their adult stage Source for information on Chordates: The Gale
  • Tunicate - Encyclopedia. com
    tunicate (tōō´nəkĬt), marine animal of the phylum Chordata [1], which also includes the vertebrates The adult form of most tunicates (also called urochordates) shows no resemblance to vertebrate animals, but such a resemblance is evident in the larva
  • Thaliacea | Encyclopedia. com
    Thaliacea (salps; phylum Chordata, subphylum Urochordata) A class of tunicates in which two siphons occur at opposite ends of the body, so the current of water passing through the animal is used for gas exchange, feeding, and also for locomotion Salps are adapted for a free-swimming, planktonic existence
  • Cephalochordata - Encyclopedia. com
    Cephalochordata (Acrania) Subphylum of Chordata, containing only Amphioxus (lancelet), probably the most primitive of living chordates, although some soft-bodied Cambrian fossils are dubiously referred to the group Cephalochordates have a notochord extending into the head, gill slits, and segmented muscle blocks, and are thought to resemble the ancestors of vertebrates
  • endostyle - Encyclopedia. com
    The endostyle is also able to take up iodine, a capacity it retains after it is transformed into the thyroid gland of the adult lamprey, when metamorphosis is complete 2 A mucus -secreting groove in the pharynx of Urochordata and Cephalochordata, and a comparable organ in Hemichordata; it is analogous to the thyroid gland in Chordata
  • Thaliacea (Salps) - Encyclopedia. com
    Thaliacea (Salps) Phylum ChordataClass ThaliaceaNumber of families 5Thumbnail description Marine, holoplanktonic organisms with cylindrical bodies that have openings on both ends Source for information on Thaliacea (Salps): Grzimek's Animal Life Encyclopedia dictionary
  • Gnathostomata - Encyclopedia. com
    Gnathostomata 1 A superclass of jawed vertebrates that includes the fishes, Amphibia, Reptilia, Aves, and Mammalia Recently it has been proposed that Gnathostomata should comprise the Elasmobranchii (sharks, rays, etc ) and the Teleostomi (i e Osteichthyes and Sarcopterygii) In this classification Pisces becomes redundant 2 (phylum Echinodermata, class Echinoidea) A superorder of
  • Orthonectida (Orthonectidans) - Encyclopedia. com
    Orthonectida (Orthonectidans) Phylum OrthonectidaNumber of families 1Thumbnail description Minute dioecious and dimorphic or hermaphroditic parasites found in tissues of a wide variety of marine invertebrate phyla Source for information on Orthonectida (Orthonectidans): Grzimek's Animal Life Encyclopedia dictionary





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