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Fig 2 - A large Late Devonian arthrodire (Vertebrata, Placodermi) from Poland

Fragments of the head shield of Dunkleosteus sp. A, specimen Muz. PGI-NRI 1809.II.18, back view. B, specimen Muz. PGI-NRI 1809.II.18, visceral view. B1, magnified fragment of fig. B. C, specimen Muz. PGI-NRI 1809.II.18, external view. C1, sketch of the external view of the specimen on C. Abbreviations for Figs 2, 4 and 6: Ce, central plate; d end, opening of the endolymphatic duct; dp. m. cu., cucullaris depression; f.lv, levator pits; laf, lateral articular fossa; m.sept, median septum; Nu, nuchal plate; PNu, paranuchal plate; pap, para-articular process; p.pr, posterior process of the nuchal plate; PrO f., contact face for the preorbital plate; ppt, pineal pit; th.n, nuchal thickening; th.pre, pre-endolymphatic thickening.
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