Epithets
| arcana | closed |
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| arcanus | closed |
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| arenaria | relating to sand |
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| arenarius | relating to sand |
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| arenicola | living in sand |
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| argentea | silvery |
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| argenteus | silvery |
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| argillicola | growing in clay |
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| arguta | sharply toothed |
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| argutus | sharply toothed |
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| argyraeus | silvery |
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| argyrotricha | silvery haired |
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| argyrotrichus | silvery haired |
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| aristata | long bristle-like tip |
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| aristatus | long bristle-like tip |