Fig. 4 in New palaeoscolecidan worms from the Lower Cambrian: Sirius Passet, Latham Shale and Kinzers Shale

Fig. 4. Palaeoscolecidans Xystoscolex boreogyrus gen. et sp. nov. (A, C–F) and Chalazoscolex pharkus gen. et sp. nov. (B, G), lower Cambrian (Series 2, stage 3), Buen Formation, Sirius Fossil−Passet Lagerstätte, Peary Land, North Greenland. A. MGUH 29147, anterior with introvert. B. MGUH 29148, enlargement of introvert and anterior trunk (B1) and entire specimen with gut trace (B2); see also Fig. 6F. C. MGUH 29149, enlargement of posterior end (C1) and entire specimen with gut trace (C2). D. MGUH 29142, enlargement of introvert, see also Fig. 3A. E. MGUH 29150, entire specimen (E1) and enlargement of introvert with everted pharyngeal region (E2); see also Fig. 6A. F. MGUH 29151, gut trace containing arthropod Isoxys volucris Williams, Siveter, and Peel, 1996 with characteristic spinose extension arrowed. G. MGUH 29137, gut trace; see also Fig. 2C. Scale bars 5 mm in D, G; otherwise 10 mm. All specimens coated with sublimate.