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. Ta,

, Po, postorbital; poc, postotic lateral line canal

, Ext, extratemporal ramification of the postotic lateral line canal

. Sbm,

. Sop, . Sq, . Su, and . Pa,

T. Ta, Comparison of dermal skull patterns across porolepiforms in lateral (A, C, E, G, I, scale bar equals 10 mm) and dorsal

, Nasogaluakus chorni (C-D) after Schultze, 1972.

F. Vorobyeva, Glyptolepis groenlandica (G-H) after Jarvik 1972. Holoptychius sp. (I-J) after Jarvik, 1972.

, Abbreviations: Br, branchiostegal rays

. De, . Ext, . Gu, and . Ifd,

. Ju, ;. L. La, and . Ex,

M. Ex,

. Mx, . Op, . Pa, and . Pae, Po, postorbital; Pp, postparietal; Pop, preopercular; Prsp, prespiracular; Psbm, preoperculosubmandibular; Qj, quadratojugal; Sbm, submandibular series; Sop, subopercular; Sq, squamosal; sSq