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Sculpture of rounded spiral bands ; penultimate whorl with 6 bands ; body whorl
sculpture variable , with 8 - 10 bands on upper whorl ; some specimens with
intermediate finer lirae ; ventral whorl with 8 – 12 lirae . Umbilicus broad , open in
Very faint rounded axial ridges seen in two specimens , 7 ridges between varices
, becoming obsolete on body whorl . Remarks Of the cymatiids currently living on
the west coast , A . casus most closely resembles Argobuccinum pustulosum ...
normally rounded to carinate in B . aestus , spiral cords single , rounded to
tabulate in T . dilemma . Etymology The specific name is derived from the Latin '
aestus ' , of the surf , and refers to the probable habitat of the species . Triumphis
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National Museum of Natural History
MS accepted 1 May 1985
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50 m Complex abbreviations Annals anterior anteriorly appear authors band Barnard base body whorl brachial valve California Cape Cape Town capital closely coast collected consisting convex Cooper deposits depth described Description developed differences Discussion distribution dorsal early extending Family figures fishes fossil genus given Group hinge Holotype Hondeklip illustrations included indicated interior Kensley Khoikhoi Khoisan known Lampanyctus Late lateral length letters lirae living loop lower margin material MICHIGAN narrow Note Ocean original ornament outer paratypes pedicle valve placed plates Pleistocene pointed posterior present range recorded references region Remarks ribs ridges rounded Scale scientific sea-level separates shell short shows similar single slightly Smith socket South African Museum southern species specimens spiral strong surface Table teeth Triphoturus University upper ventral waters whorl width Zone