Photographs: Left photo: SEM of Sphenotrochus senni Wells, 1945; specimen NMB D5891, locality NMB 16938. Right photo: Holotype of Sphenotrochus senni Wells, 1945; specimen USNM 68358 (Martinique).
Photos in Cairns and Wells, 1987, Plate 9, Figs. 15, 18.
Scale bar for both photos = 1.0 mm.
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