Acanthochitonidae: Acanthochitona
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2a.
Valves triangular in shape, jugal area raised and sharply separated from lateropleural areas, tegmentum covered with densely arranged, small and round granules. |
2b.
Valves ellipsoidal in shape, jugal area hardly separated from lateropleural areas, tegmentum covered with oval to elongated oval, decidedly separated, granules.
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| Acanthochitona fascicularis | |
