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Fig. 1 | BMC Evolutionary Biology

Fig. 1

From: Cambrian suspension-feeding lobopodians and the early radiation of panarthropods

Fig. 1

Ovatiovermis cribratus from the Burgess Shale, Royal Ontario Museum (ROM) 52707: (ae, i, j) part, (g, h) counterpart, (f) reconstructed death pose. Close-ups indicated by white rectangles. a, b full specimen under direct (a) and polarized (b) lighting conditions. ce superposed elemental maps of carbon (red) and calcium (purple) before preparation of the 8th left lobopod (lL8—see a). The lighter colours represent higher concentrations of elements: parts of the gut, proboscis, pharyngeal area and claws are preserved in carbon whereas the rest of the body is preserved in calcium (see also Additional file 6). gj details of the anterior part of the body showing internal organs in lobopods (g), pair of visual organs (g, h), spinules and bifid claws (g, i, j). Digital single-lens reflex (DSLR) images taken using direct light (a, i, j) and cross-polarized light (b, g, h), all under dry conditions except (b, g and h). A, annulations; C, claw; Ds, dark stain; E, “eye” (visual organ); G, gut; H, head; I, internal organ; L, lobopod (l, left; r, right; x,y, lobopod position); Lu; foregut lumen; M, mouth; Pr, proboscis; S, spinules. Scale bars: 5 mm (ac, g, i), 1 mm (e, d, h, j)

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