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122 ADVANCES IN PALAEOICHTHYOLOGY Diagnosis. Nostolepis with high-crowned scales having porose necks. Wide raised triangular medial area dominates on crowns, which bear five to eight sub-parallel anterior ridges that extend half of crown length, or reach its posterior part converging with the longest central ridges. The lateral crown slopes are ornamented by longitudinal or oblique ridges converging with the longest medial ridges posteriorly. Up to four superposed
J. Valiukevičius. Silurian acanthodians from Lūžņi-4 123 lamellae in crowns are composed of Stranggewebe and simple networked bone-like mesodentine and contain a well developed main vascular system with particularly large radial vascular canals over the bases of scales. The Stranglacunae are long, dense, with numerous osteocytes interspersed. The Stranggewebe layers are enveloped in the lamellae by strips of highly cellular mesodentine.
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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LATVIJAS UNIVERSITĀTES RAKSTI 679.
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Contents Ervīns Lukševičs and Ģ
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ACTA UNIVERSITATIS LATVIENSIS, 2004
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Ervīns Lukševičs, Ģirts Stinkul
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Olga Afanassieva. Microrelief on th
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D.K. Elliott, E. Mark-Kurik, E.B. D
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C.G.Miller, T. Marss, H. Blom. New
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H.-P. Schultze, T. Marss. Revisitin
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