File:Aria 2021 Fossil arthropods.jpg

English: Figure 1. (Previous page) Variety of preservations and fossils that have recently reshaped or challenged our views on early arthropod evolution. a, Alacaris multinoda Yang et al. [54], specimen YKLP 12268 (holotype), from the Xiaoshiba biota; a fuxianhuiid. Image courtesy of Xiguang Zhang. b, Ercaicunia multinodosa Zhai et al. [32], specimen YKLP 16201, from the Chengjiang biota; a hymenocarine. X-ray computed tomography, image courtesy of Dayou Zhai. c, Mollisonia plenovenatrix Aria and Caron [55], specimen ROMIP 65262, from the Burgess Shale(Marble Canyon); an early chelicerate. Image courtesy of Jean-Bernard Caron. d, Gnathobases of Wisangocaris barbarahardyae Jago et al. [56], specimen SAM P45629, from the Emu Bay Shale; a habeliidan. Image courtesy of Jim Jago. e, Yicaris dianensis Zhang et al. [57], specimen YKLP 10844, from the Yu’anshan “Orsten” biota; a larval crustaceomorph. Scanning electron microscropy, image courtesy of Xiguang Zhang. f, Surusicaris elegans Aria and Caron [58], specimen ROMIP 62976 (holotype), from the Burgess Shale (Marble Canyon); an isoxyid. Image courtesy of Jean-Bernard Caron. g, Kerygmachela kierkegaardi Budd [59], specimen MGUH 32048a, from Sirius Passet; a swimming lobopodian. Image courtesy of Jakob Vinther. h, i, Aegirocassis benmoulae Van Roy et al. [60], from the Fezouata biota; a radiodontan. Images courtesy of Derek Briggs. h, Specimen YPM 527123, filter-feeding frontal appendages. i, Specimen YPM 237172, whole body, three-dimensional. j, Cascolus ravitis Siveter et al. [61], specimen OUMNH C.29698, from the Herefordshire biota; a possible malacostracan. Digital reconstruction from serial photography, image courtesy of David Siveter, Derek Briggs, Derek Siveter, Mark Sutton and David Legg. k, Hongshiyanaspis yiliangensis Zhang and Lin in Zhang et al. [62], specimen NIGPAS 164503, from the Xiazhuang biota; a trilobite. Image courtesy of Han Zheng. l, Ovatiovermis cribratus Caron and Aria [37], specimen ROMIP 52707, from the Burgess Shale (Walcott Quarry); a suspension-feeding lobopodian. Image courtesy of Jean-Bernard Caron. m, Yawunik kootenayi Aria et al. [63], specimen ROMIP 63066, from the Burgess Shale (Marble Canyon); a leanchoiliid megacheiran. Image courtesy of Jean-Bernard Caron. Arrowheads point to: subdivided, enditic basipod (a), raptorial and sensory complex of appendages (c), tripartite exopods (k), stout lobopods for anchoring (l) and robust basis of cheira (m). Abbreviations: an, antennule(s); at, antenna(e); ca, carapace; cr, cheira(e); cs, cephalic shield; en, endopod(s); gn, gnathobasipod; he, h-element “carapace”; la, labrum; lb, lobopod(s); lbf, lobopodous flaps; le, lateral eye(s); ma, mandible(s); me, median eye(s); mo, mouth apparatus; mp, mandibular palp; mx, maxillula and maxilla; ph, peri-intestinal hemocoelic cavity; py, pygidium; ta, trunk appendage(s). Scale bars, 10mm (a, g, m), 1mm (b, j), 3mm (c, f, k, l), 2mm (d), 100μm (e), 20mm (h), 100mm (i).