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1“..., with no clear boundaries, often with irregular central peak; 2–3 lacunae between adjacent costae, proximal ones...”
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2“..., with no clear boundaries, often with irregular central peak; 2–3 lacunae between adjacent costae, proximal ones...”
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3“..., with no clear boundaries, often with irregular central peak; 2–3 lacunae between adjacent costae, proximal ones...”
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4“... shield of pinnate costal spines, these with rows of intercostal lacunae, and at least one pseudopore...”
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5“... shield of pinnate costal spines, these with rows of intercostal lacunae, and at least one pseudopore...”
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6“... irregular, with no clear boundaries; 3–5 subrounded to oval lacunae between adjacent costae; each costa...”
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7“... irregular, with no clear boundaries; 3–5 subrounded to oval lacunae between adjacent costae; each costa...”
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