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36 ADVANCES IN PALAEOICHTHYOLOGY Fig. 6. Perscheia pulla gen. et sp. nov. Holotype (CMN-NUFV101), posterior part of the dorsal plate in external (A) and internal (B) view; C, dorsal plate fragment (CMN-NUFV102) in dorsal view; D, dorsal plate fragment (CMN-NUFV103) in dorsal view; posterolateral part of the dorsal plate (CMN-NUFV104) in ventral (E) and dorsal (F) views and a detail of the lateral notch showing posteriorly oriented ridges and grooves (G). Scale bars equal 50 mm (A-F) and 20 mm (G).
D.K. Elliott, E. Mark-Kurik, E.B. Daeschler. A revision of Obruchevia 37 Fig. 7. Perscheia pulla gen et sp. nov. Outline of plates with canals accentuated. A, holotype, posterior part of the dorsal plate (CMN-NUFV 101); B, dorsal plate fragment (CMN- NUFV 102); C, dorsal plate fragment (CMN-NUFV 103); D, posterolateral part of dorsal plate (CMN- NUFV 104). Scale bars equal 50 mm. The internal surface (Fig. 6E) is concavo-convex, shiny and smooth. Several growth lines are present parallel to the curved margin and a number of large smooth blisters are present towards what appears to be the lateral margin of the plate. The basal layer is dense, laminar, and up to 2 mm thick. The embayment is about 55 mm long and has a rounded natural margin. At one end it curves towards the outer margin until truncated by the broken edge, in the other it meets the broken end of the plate. Although broadly rounded, the margin shows three well-developed rounded ridges, about 5 mm across, that run diagonally from the inner to the outer surface and terminate externally in a blister (Fig. 6G). Part of a fourth is
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Page 5 and 6: Contents Ervīns Lukševičs and Ģ
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Page 9 and 10: Ervīns Lukševičs, Ģirts Stinkul
Page 15 and 16: Olga Afanassieva. Microrelief on th
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E. Lukševičs, I. Zupiņš. Sedime
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