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Wednesday, August 12, 2020 | History

2 edition of Ordovician polyplacophora (mollusca) from North America found in the catalog.

Ordovician polyplacophora (mollusca) from North America

Richard David Hoare

Ordovician polyplacophora (mollusca) from North America

by Richard David Hoare

  • 17 Want to read
  • 24 Currently reading

Published by Paleontological Society in Lawrence, KS .
Written in English

    Subjects:
  • Chitons -- North America.,
  • Mollusks -- North America.,
  • Paleontology -- Ordovician.

  • Edition Notes

    StatementRichard D. Hoare and John Pojeta, Jr.
    SeriesPaleontological Society memoir -- 64., Journal of paleontology supplement -- v. 80, no. 3., Memoir (Paleontological Society) -- 64., Journal of paleontology -- v. 80, no. 3.
    ContributionsPojeta, John.
    The Physical Object
    Paginationi, 27 p. :
    Number of Pages27
    ID Numbers
    Open LibraryOL16136971M

    Polyplacophora at the Tree of Life Web Project Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. () A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e doi: / pmid Monograph of Living Chitons (Mollusca: Polyplacophora) Chitons form a peculiar and highly interesting class of molluscs, known with certainty to exist since the Ordovician, and widespread in all world seas, with great concentrations along the west coast of North America and in Australia, to depths from 0 to over m.

      An Australian chiton filmed moving on the Northern Tasmanian coastline. Most polyplacophora are nocturnal, that is, they move around and eat mostly at night. A polyplacophora may spend its entire life in the very small area of a few feet. Polyplacophora often show a "homing behavior". If they get knocked off their rock, they can usually find their way back.

    Polyplacophora in the earliest Cambrian. It also suggests an origin for the class m late Proterozoic. Yallgtzcchiton and Lllyallhaochitol1, represented the study material, are typical polyplacophorans having head, intermediate and tail valves, each with a tegmentum and an articulamentum. These. The Scaphopoda are a distinctive group of molluscs commonly known as the "tusk shells" because their shells are conical and slightly curved to the dorsal side, making the shells look like tiny tusks (see the photos below). The scientific name Scaphopoda means "shovel foot," a term that refers to the "head" of the animal, which lacks eyes and is used for burrowing in marine .


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Ordovician polyplacophora (mollusca) from North America by Richard David Hoare Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

The class Polyplacophora was named by de Blainville Etymology. The English name "chiton" originates from the Latin word chitōn, which means "mollusc", and in turn is derived from the Greek word khitōn, meaning tunic (which also is the source of the word chitin).Class: Polyplacophora, Blainville, ordovician polyplacophora (mollusca) from north america RICHARD D.

HOARE AND JOHN POJETA JR. Department of Geology, Bowling Green State University, Bowling Green, Ohio and U.S. Geological Survey and Department of.

Ordovician Polyplacophora (Mollusca) from North America Article in Journal of Paleontology 80(May ) January with 29 Reads How we measure 'reads'.

Chitons form a peculiar and highly interesting class of molluscs, known with certainty to exist since the Ordovician, and widespread in all world seas to depths from 0 to over 7, m.

In recent years taxonomists all over the world have much contributed to our knowledge of the chitons and their synonymy, so that the number of living species now amounts to some Polyplacophora: Order: † Paleoloricata: Family: † Chelodidae: Genus: † Calceochiton: Calceochiton is an extinct genus of polyplacophoran molluscs.

Calceochiton became extinct during the Ordovician period. References This prehistoric mollusc article is a stub. You can help Class: Polyplacophora.

Tripathy, A.K. Mukhopadhyay, in Marine Faunal Diversity in India, Class polyplacophora. Globally, the class Polyplacophora is represented by 1 order, 3 suborders, 9 families and 49 genera; of these, 21 species belonging to 10 genera under 5 families within 2 suborders and 1 order are found in India, as summarized below.

Ischnochitonidae. This family is further divided. The 14 previously-named families of Cambrian and Ordovician chitons are reviewed and analyzed. Aulochitonidae n. fam. is defined, based on. Polyplacophora are found in cold waters and in tropical waters.

Some live in tidal zones and can hold up to air exposure for periods of time. Others can live as deep as 20, feet under the surface of the water.

They are only found in salt water. Chitons form a peculiar and highly interesting class of molluscs, known with certainty to exist since the Ordovician, and widespread in all world seas to depths from 0 to over 7, m. In recent years taxonomists all over the world have much contributed to our knowledge of the chitons and their synonymy, so that the number of living species now.

Citing this page: Tree of Life Web Project. Polyplacophora. Chitons. Version 01 January (temporary). Matthevia (Polyplacophora) invades the Ordovician: The first reported post-Cambrian occurrence Journal of Paleontology By: J.

Pojeta Jr., John F. Taylor, and G. Darrough. Chitons may be found mainly in the littoral surf zone. About species of this primordial mollusc class are known today. The largest one is Cryptochiton stelleriwith 33 cm (about 14 in.), living on the American north western coast.

In colloquial language, chitons are also called coat-of-mail shells, their shell resembling the segmental armour on a knight's gauntlet, though, as we shall. Mollusca is the second-largest phylum of invertebrate animals after the members are known as molluscs or mollusks (/ ˈ m ɒ l ə s k /).Aro extant species of molluscs are recognized.

The number of fossil species is estimated betw andadditional species. The proportion of undescribed species is very m: Animalia. Polyplacophora definition is - an order of Amphineura comprising the chitons all of which have the foot occupying the whole ventral surface of the body and. Atono,y of Mollusca.

Preview this book Mesozoic molluscs Monoplacophora morphology muscle muscular musculature Myogenesis Nautilus nephridia nervous system occur omaments Ordovician organs oysters pair Paleozoic pallial Paragastropoda pattem pedal periostracum phylum planispiral Polyplacophora posterior primitive prosobranchs pulmonates 1/5(1).

Chitons are generally bilaterally symmetrical with an ovoid, flattened body. The most distinctive characteristic of chitons is their eight-piece shell. Each of these eight plates is quite similar, except for the first and last (the cephalic and anal plates).

The posterior margin of each plate projects backwards, and the anterior lateral margins of each one bears a large wing that projects forward.

Phylogenetic position. In a molecular study on Laevipilina antarctica suggested that extant Monoplacophora and Polyplacophora form a well-supported clade with the researched Neopilina closest to the chitons. The two classes in this new clade, with the proposed name Serialia, all show a variable number of serially repeated gills and eight sets of dorsoventral pedal retractor (unranked): Monoplacophora, Odhner, Michael J.

Vendrasco and Bruce Runnegar,Late Cambrian and Early Ordovician stem group chitons (Mollusca: Polyplacophora) from Utah and Missouri, Journal of Paleontology, Julyv. 78, p. Monograph of Living Chitons (Mollusca: Polyplacophora), Volume 1 Order Neoloricata: Lepidopleurina Hardcover – by P.

Kaas,R. Belle,Piet Kaas,R. Van Belle, (Author) Be the first to review this item. See all formats and editions Hide other formats and editions. Price First published:. Start studying Phylum Mollusca - Class Polyplacophora.

Learn vocabulary, terms, and more with flashcards, games, and other study tools.The Polyplacophora, or chitons, differ from all other mollusks in several anatomical particulars.

The most striking is that the shell consists of eight somewhat overlapping calcareous plates or valves (Fig. 1) instead of a single shell or pair of shells, as in the gastropods and the valves are embedded in a tough, muscular girdle, which holds them in place .Polyplacophora (Loricata; chitons, coat-of-mail shells; phylum Mollusca, class Amphineura) A subclass of amphineurans in which seven or eight dorsal plates are generally composed of calcium carbonate and are enclosed by a spiculate plates articulate with one another and overlap to a varying extent.

The anterior and posterior plates differ from the others, the .