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Macrodactyla fautinae sp. nov., internal morphology. A, diffuse-circumscript mesenteries of an individual (ZRC.CNI.0296), cross section at mid-column. Note the presence of the retractor pennon. B, a conspicuous, circumscribed marginal sphincter muscle of another individual (ZRC.CNI.0255). Abbreviations: f, fosse; mf, mesenterial filaments; p, pennon; sph, marginal sphincter muscle; t, tentacles. Scale bars = 1 mm.
