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      Morphology, taxonomy, and classification of the order Eurypterida Burmeister, 1843

      Journal of Paleontology
      Cambridge University Press (CUP)

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          Abstract

          Standards have been empirically developed to describe various morphological characters of eurypterids. The standards pertain to the following characters: 1) shape of the prosoma; 2) shape of the metastoma; 3) shape of the eyes; 4) position of the eyes; 5) types of prosomal appendages; 6) types of swimming leg paddles; 7) structure of the doublure; 8) differentiation of the opisthosoma; 9) structure of the genital appendages; 10) shape of the telson; and 11) types of ornamentation.

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          A New Eurypterid from the Ordovician of Montgomeryshire, Wales

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            Problems of functional morphology and classification in stylonuroid eurypterids (Chelicerata, Merostomata), with observations on the Scottish Silurian Stylonuroidea

            Eurypterids of the Superfamily Stylonuroidea Diener 1924sensuStørmer (1974, 373) from the Pentland Hills, Midlothian, are redescribed and the evidence which these forms may give concerning the life environment of the Gutterford Burn Eurypterid Bed (Upper Llandovery), from which most of them have been obtained, is considered. Five species are recognised.Parastylonurus ornatus(Laurie) is redescribed with special reference to the organs of locomotion and reproduction. A new form from the Gutterford Burn is described asParastylonurus hendersonisp. nov.Stylonurus macrophthalmusLaurie is designated the type species of the new genusHardieopterusandStylonurus knoxaeLamont as the type species of the new genusLamontopterus. The unique holotype ofLamontopterus knoxaeis of morphological interest in showing evidence of the gut.
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              Cyrtoctenus wittebergensis sp. nov. (Chelicerata: Eurypterida), a large sweep-feeder from the Carboniferous of South Africa

              Cyrtoctenus wittebergensissp. nov. is described from a unique holotype from the Witteberg Group of the Cape Supergroup. It is a giant hibbertopteroid eurypterid having combs and specialised movable spines of crytoctenid type (Størmer & Waterston 1968) on the more distal podomeres of the second to fourth prosomal appendages. The function of the combs and their associated movable spines is discussed and it is suggested that together they formed a unique adaptation of eurypterid structures to sweep filter-feeding, the combs forming the filters and the spines the cleaners. The digestive tract is remarkably preserved and shows a spiral valve, posterior to the stomach, which is interpreted as an adaptive feature in this large arthropod to increase the absorptive area of the gut.
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                Author and article information

                Journal
                applab
                Journal of Paleontology
                J. Paleontol.
                Cambridge University Press (CUP)
                0022-3360
                1937-2337
                September 1989
                May 2016
                : 63
                : 05
                : 642-657
                Article
                10.1017/S0022336000041275
                5ccbc15c-da73-4115-9694-246917b43b08
                © 1989
                History

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