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Figure 1 | BMC Evolutionary Biology

Figure 1

From: A new vetulicolian from Australia and its bearing on the chordate affinities of an enigmatic Cambrian group

Figure 1

The early Cambrian vetulicolian Nesonektris aldridgei . A-C, Holotype SAM P45212a,b, specimen with distal end of posterior body region (S4-S7) folded over itself, anterior towards left; A, part, anterior rim exposed by preparation (arrow points to cuticle wall under the rod); B, Counterpart, with severed notochord (detail in Figure 2B); C, camera lucida drawing, grey indicates sediment infill; D, SAM P49084a, nearly complete specimen, only lacking one side of anterior region body; E, SAM P48073a, nearly complete specimen; F, SAM P48015a, nearly complete but folded specimen; showing fold on anterior region (oblique arrow) and continuous connection between anterior and posterior body regions along the dorsal margin (vertical arrow); G, Reconstruction; abbreviations: dk = dorsal keel; eb = epibionts; ism = intersegmental membrane; lg = lateral groove; nc = notochord; om = oral margin; vk = ventral keel; S1-S7 = posterior body region segment number; scale bars, 5 mm.

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