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Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...

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122<br />

ADVANCES IN PALAEOICHTHYOLOGY<br />

Diagnosis. Nostolepis with high-crowned scales having porose necks. Wide raised<br />

triangular medial area dominates on crowns, which bear five to eight sub-parallel anterior<br />

ridges that extend half of crown length, or reach its posterior part converging with the<br />

longest central ridges. The lateral crown slopes are ornamented by longitudinal or oblique<br />

ridges converging with the longest medial ridges posteriorly. Up to four superposed

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