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      PTERYGOTIDS (CHELICERATA; EURYPTERIDA) FROM THE SILURIAN VERNON FORMATION OF NEW YORK

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      Journal of Paleontology
      Paleontological Society

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

          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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            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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              The pterygotid telson as a biological rudder

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                Author and article information

                Journal
                Journal of Paleontology
                Journal of Paleontology
                Paleontological Society
                0022-3360
                1937-2337
                July 2007
                July 2007
                : 81
                : 4
                : 725-736
                Article
                10.1666/pleo0022-3360(2007)081[0725:PEFTSV]2.0.CO;2
                0717c5b2-eaf5-492f-93d3-c15bfb7d91a0
                © 2007
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