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Guide to Ulnaria acus

(Kütz.) Aboal 2003

Ulnaria Acus Guide Aac
  1. Valves narrow-lanceolate
  2. Apices attenuated, subrostrate to subcapitate
  3. Central area present
  4. Rimoportulae present

Valves are narrow-lanceolate, often with subrostrate to subcapitate apices. The sternum is narrow, expanding to a central area where ghost striae often present. Rimoportulae are present at the apices.

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