Fig. 7. Bivalved arthropod Isoxys longissimus Simonetta and Delle Cave 1975 in Soft-part preservation in two species of the arthropod Isoxys from the middle Cambrian Burgess Shale of British Columbia, Canada

Fig. 7. Bivalved arthropod Isoxys longissimus Simonetta and Delle Cave 1975. Burgess Shale Formation, middle Cambrian, near Field, British Columbia, Canada (see Fig. 1), general morphology. A. USNM 18170, holotype. B. ROM 57910A. C. ROM 57911A. D. ROM 57909A. E. ROM 57908A, B; E1, part of slightly oblique specimen with soft−body preservation, including large eye, telson and some possible exopods; E2, counterpart; E3, line drawing of specimen. F. ROM 57919A. All laterally compressed specimens. A, low angle light from top left; B–F, polarized light.