Corpus ID: 83138390

The subphylum Calcichordata, (Jefferies 1967) : primitive fossil chordates with echinoderm affinities

@inproceedings{Jefferies1968TheSC,
  title={The subphylum Calcichordata, (Jefferies 1967) : primitive fossil chordates with echinoderm affinities},
  author={R. Jefferies},
  year={1968}
}
A NEW MITRATE (ECHINODERMATA, STYLOPHORA) FROM THE TREMADOC OF SHROPSHIRE (ENGLAND) AND THE ORIGIN OF THE MITROCYSTITIDA
TLDR
Plate homologies are identified and discussed in primitive representatives of cornute and mitrate stylophorans and a cladistic analysis of selected stylophoran taxa indicates that cornutes and mitrates are sister-groups, both deriving from a Ceratocystis-like ancestor. Expand
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Abstract The palaeobiogeographical distribution of the six major clades of Ordovician echinoderms (asterozoans, blastozoans, crinoids, echinozoans, edrioasteroids and stylophorans) is analysed basedExpand
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This investigation uncovers the evolutionary foundations of vertebrate endoderm-derived structures, and demonstrates that the number of organ primordia were reduced during evolution. Expand
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A new rare nearly bilaterally symmetrical cornute from the Mila Formation, upper Middle–early Late Cambrian (Series 3, Furongian) from northern Iran is described, Persiacarpos jefferiesi gen. and sp.Expand
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Abstract Although stemmed crinoids are well-known from modern oceans, the post-Palaeozoic Articulata represent a slender ‘twig’ that survived the demise of the many other clades forming a ‘bush’ ofExpand
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The nephridial hypothesis of the gill slit origin.
  • O. Ezhova, V. Malakhov
  • Biology, Medicine
  • Journal of experimental zoology. Part B, Molecular and developmental evolution
  • 2015
TLDR
A discussed hypothesis of the gill slits origin from the metameric nephridia is that the meetingameric gill pores originate from the meetameric excreting pores, and themetameric branchial sacs originate fromThe metamerics endodermal pockets of the gut fused with the coelomoducts. Expand
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Pentaradial echinoderms diversified rapidly from the beginning of their history, and the most significant differences between groups are recorded in the construction of the oral area and ambulacra, as well as the nature of their feeding appendages, which provides a clear narrative of the early evolution of the echinoderm body plan. Expand
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Large crinoid pluricolumnals and attachment structures from the Mississippian of Salthill Quarry in Lancashire, England, have been left in open nomenclature, with the mesistele-dististele transition involves an abrupt increase in diameter. Expand
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Reexamination of the type material of the solutan Plasiacystis mobilis from the Sarka Formation (Darriwilian) of Bohe­mia (Czech Republic) shows that its original reconstruction is a composite, withExpand
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