Fig. 2
From: Cambrian suspension-feeding lobopodians and the early radiation of panarthropods
Ovatiovermis cribratus from the Burgess Shale, Royal Ontario Museum (ROM) 52707: scanning electron microscopy images in secondary electron mode (a–d, k–m, o, p) or backscatter mode (e–i, n). Close-ups indicated by white rectangles (solid lines) and arrows. a Full specimen (the 8th left lobopod, lL8—dashed white rectangle—photographed after preparation) and details of a posterior claw (b), spinule (c), and bifid anterior claw (d). e posterior single claws showing one possible stacked element (arrows). f, g black, carbonaceous remnants of the gut (dorsal side of the gut defined by vertical arrows; compare with (a)), particularly visible along body folds created by the compression of the opposite lobopod pair. h detail of the heard showing proboscis, pharyngeal area and one visual organ. (i–j) tooth-like structures along the proboscis (dark elements in drawing j). k–m detail of the “head” showing the left and right visual organs preserved on the part (k) and counterpart (l) respectively; (m) images of part and counterpart superposed using Calculation mode in Adobe Photoshop CS6 showing both visual organs together. n detail of the right visual organ. o, p detail of the anterior lobopods on the counterpart and detail of posterior lobopods (rL3–5) on the part showing spinules. A, annulations; Bc, basal unit of the claw; C, claw; Ca, compression artifact; 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; T, teeth. Scale bars: 1 mm (a, o, p), 0.5 mm (f, k–m), 0.2 mm (b–e, g, h), 0.1 mm (i, j, n)