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Geological Society, London, Special Publications; 1967; v. 2; p. 479-497;
DOI: 10.1144/GSL.SP.1967.002.01.36
© 1967 Geological Society of London

Invertebrata

Chapter 18 Arthropoda: Protarthropoda and Trilobitomorpha

J. W. Cowie, Ph.D. F.G.S., W. T. Dean, Ph.D. F.G.S., R. Goldring, Ph.D. F.G.S., W. D. I. Rolfe, Ph.D. F.G.S., A. W. A. Rushton, Ph.D., J. T. Temple, M.A. Ph.D. F.G.S. & R. P. Tripp

Department of Geology, The University, Queen’s Buildings, Bristol 8
Department of Palaeontology, British Museum (Natural History), Cromwell Road, London S W 7
Department of Geology, The University, Reading, Berkshire
Hunterian Museum, The University, Glasgow W 2, Scotland
Geological Survey and Museum, Institute of Geological Sciences, Exhibition Road, London S W 7
Department of Geology, Birkbeck College, Malet Street, London W C 1
High Wood, Botsom Lane, West Kingsdown, Sevenoaks, Kent

First and Last, M.Camb: Aysheaia pedunculata Walcott, Bathyuriscus-Elrathina Z., Burgess Shale, British Columbia. Xenusion Pompeckj, ?Pre-Camb-Camb (Pleist drift), Germany, may be Onychophora but age unknown (Treatise O and W, Glaessner 1962).

Comment: Ancestor of Euonychophora Hutchinson, Quat Holo.

First and Last, M.Camb: Marrella splendens Walcott, Bathyuriscus-Elrathina Z., British Columbia (Treatise O; Simonetta 1962, ref. in Whittington & Rolfe 1963, p. 19). Mimetaster Gürich, Dev Siegen, has been regarded as a later marrellomorph (Dechaseaux in Piveteau 1953), but may be a crustacean metanauplius (Treatise R). Pygaspis Beurlen 1934, Perm Assel, is not Marrellomorpha but Crustacea Pygocephalomorpha (Brooks 1962).

First, L.Camb: Sidneyia? [Amiella] prisca (Mansuy in Deprat & Mansuy) 1912, Palaeolenus Z., Indochina (Simonetta 1964). S.groenlandica Cleaves, Pre-Camb Varang, is inorganic (Rolfe 1963). The L. Camb taxa erected by Vologdin (1965) are based on pseudofossils, probably rolled-up mud flakes.

First and Last, M.Camb: Burgessia and Waptia Walcott, Bathyuriscus-Elrathina Z., British Columbia (Treatise O).

First and Last, Dev Siegen: Cheloniellon calmani Broili, Hunsrückschiefer, Germany (Treatise O).

First and Last, M. Camb: Opabinia regalis Walcott, Bathyuriscus-Elrathina Z., British Columbia (Treatise O).

First and Last, M.Camb: Yohoia, Helmetia, Mollisonia Walcott, Houghtonites Raymond 1931, Bathyuriscus-Elrathina Z., British Columbia. Tontoia Walcott, ?Albertella Z., Arizona, is a doubtful, earlier record; Yohoia?, U.Camb, Siberia, may be a later record (Novozhilov in Orlov 1960, p. 195).

Introduction: The classification of Treatise O has been adopted as a framework because of its general availability to readers, but it should be emphasised that there is at present no generally acceptable major classificatory scheme for the trilobites. Where individual families are considered

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