File:Pygocirrus.jpg

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Description
English: Figure 1. Fossil annelids used in this study. (a) Pygocirrus butyricampum MGUH31365; (b) Phragmochaeta canicularis MGUH3088; (c) ROM62927, undescribed polychaete from Marble Canyon; (Note: named as Kootenayscolex barbarensis in 2018) (d) Canadia spinosa USNM83929c; (e) Burgessochaeta setigera USNM198705; (f) Kenostrychus clementsi OUM C.29544 (top right), OUM C.29543; (g) Arkonips topororum UMMP 73795; (h) Mazopherusa prinosi; (i) Fossundecima konecniorum ROM47990; (j) Esconites zelus ROM47521; (k) Dryptoscolex matthiesae ROM48542. (a,b) Early Cambrian, Sirius Passet, North Greenland; (c–e) Middle Cambrian, Burgess Shale, British Columbia; (f) Silurian (Wenlock), Herefordshire; (g) Middle Devonian, Arkona Shale, Hungry Hollow, Arkona, Ontario; (h–k) Carboniferous (Pennsylvanian), Mazon Creek, Illinois. Images (f) and (g) courtesy of Mark Sutton and Derek Briggs, respectively. (Online version in colour.)
Date
Source Parry et al. (2016) The impact of fossil data on annelid phylogeny inferred from discrete morphological characters https://royalsocietypublishing.org/doi/10.1098/rspb.2016.1378
Author Luke A. Parry, Gregory D. Edgecombe, Danny Eibye-Jacobsen and Jakob Vinther
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