Amusium bocasense Olsson, 1922
OLSSON, A. A. 1922. The Miocene of Nothern Costa Rica with notes on its general stratigraphic relations. Bulletins of American Paleontology, 9 (39): 1-460, pls. 1-32. [p. 378, pl. 17, figs. 3-4]
1922 Amusium bocasensis Olsson, 1922
A. A. Olsson, 1922, plate 17.
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«Shell rather small, thin and subcircular in outline; moderately convex; ears proportionately larger than in A. luna, and with their dorsal margins slightly inclined upwards from the beaks to their outer edges; the surface is smooth and polished, finely covered with concentric growth-lines and faintly showing the position of the internal lirae; interior of shell with about 34 lirae, which are usually nearly evenly spaced and not in pairs; the internal lirae commence well in the interior of the shell, but are strongest distally.
Height 40, breadth 43. 35 38, thickness 6 mm. (right valve) A much smaller and more delicate species than the Amusium luna Brown and Pilsbry. The internal lirae are more or less equally spaced and not in pairs. It differs from Amusium Lyonii Gabb from the lower Miocene of Sapota, Costa Rica by its much smaller ears. Gatun Stage: Bocas del Toro.» AXEL ADOLPH OLSSON, 1922
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«Species of American Neogene Amusium that lack external radial ribs on their umbones and are thus comparable to A. papyraceum are A. toulae (Brown & Pilsbry, 1911) [junior synonyms Pecten (Amusium) luna Brown & Pilsbry, 1913, and possibly A. bocasense Olsson, 1922], A. mortoni (junior synonym Amusium rexmaris Maury, 1925a), A. darwinianum (d'Orbigny, 1842), and A. paris del Río, 1992.»
WALLER, T. R. 2011. Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley. Bulletins of American Paleontology, 381: 1-197. [p. 98]
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