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| 背面描述 | The reverse is fashioned as the interior of the Cyrtonaias tampicoensis mussel shell, realistically shaped as a concave bivalve basin with a richly iridescent holographic finish that replicates the lustrous nacre of the living mollusc in multicoloured tones of green, blue, red, and violet. A single rose-pink freshwater pearl is affixed at the upper-centre of the interior, resting within a recessed setting that evokes the natural pearl-forming environment. The date 2013 is inscribed in small characters along the upper lip of the shell. |
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| 背面铭文 | 2013 |
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| 附加信息 |
Palau's conservation coin program, which began in the 1990s, has produced dozens of species-themed issues — most tied to Pacific marine ecosystems. The Tampico pearlymussel (Cyrtonaias tampicoensis) is a conspicuous outlier: a freshwater bivalve native to the Rio Grande and Tamesi river drainages in Mexico and Texas, with no geographic connection to Palau whatsoever. The series routinely licensed species of global conservation concern, and this mussel qualifies — its riverine habitat has been severely degraded by agriculture and water diversion.