Alternative plural of ampyx; multiple specimens or species of the trilobite genus ampyx.
From ampyx + -es (variant plural ending). Some paleontological texts use this classical plural form instead of the more common 'ampyx' (unchanged plural).
Paleontologists sometimes debate plural forms—some use 'ampyx' (unchanged, treating it as a genus name), while 'ampyxes' follows the Latin plural convention, showing how scientific naming conventions can vary even among experts.
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