Fig. 12 in The Hirnantian (Late Ordovician) brachiopod fauna of the East Baltic: Taxonomy of the key species

Fig. 12. Heterorthid brachiopod Heterorthina? sp. from the Kuldiga Formation of the Porkuni Regional Stage, Hirnantian (Upper Ordovician), East Baltic, western Latvia. Shell, LDM 328-75, Blīdene-5, depth 819.3 m, ventral (A), anterior (B), posterior (C), dorsal (D), and lateral (F) views, and detail of external ornament (E) of the ventral valve showing the growth lines and aditicules. Scale bars 2 mm.