Fig. 1. Pinnocaris and Eotebenna. A, B. Pinnocaris lapworthi Etheridge, 1878 in Pinnocaris and the origin of scaphopods

Fig. 1. Pinnocaris and Eotebenna. A, B. Pinnocaris lapworthi Etheridge, 1878, Ordovician, Girvan, southern Scotland; A1, A2, lateral view of internal mould of partially crushed specimen with adherent shell patches showing the pegma and the coiled protoconch, NHM In 20372, scale bars: A1 3 mm, A2 1 mm; B1, B2, lateral view of partially crushed specimen showing the coiled protoconch, NHM In 20400; scale bars: B1 3 mm, B2 1 mm. C. Eotebenna viviannae Peel, 1991, Middle Cambrian, Andrarum Limestone, Bornholm, Denmark, right side of phosphatic internal mould showing the protoconch, MGUH 19.565, scale bar 100 µm. D. Yochelcionella greenlandica Atkins and Peel, 2004, Lower Cambrian, Aftenstjernesø Formation, Peary Land, North Greenland, lateral view of right side showing the prominent snorkel, MGUH 27.018 from GGU sample 271470, scale bar 200 µm. E. Eotebenna arctica Peel, 1989, Lower Cambrian, Henson Gletscher Formation, Freuchen Land, North Greenland, lateral view which has been horizontally mirrored to enhance comparison, MGUH 18.701 from GGU collection 315109, scale bar 1 mm.