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Achnanthes biporoma Hohn & Hellerman 1963
| GC44261 Achnanthes biporoma Hohn & Hellerman 1963 Circled specimen 1 on holotype slide; rapheless valve |
| GC44261 Achnanthes biporoma Hohn & Hellerman 1963 Circled specimen 2 on holotype slide; raphe valve |
| GC44261 Achnanthes biporoma Hohn & Hellerman 1963 Circled specimen 2 on holotype slide; rapheless valve |
| GC44261 Achnanthes biporoma Hohn & Hellerman 1963 Circled specimen 3 on holotype slide; raphe valve |
| GC44261 Achnanthes biporoma Hohn & Hellerman 1963 Circled specimen 3 on holotype slide; rapheless valve |
