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a.1.(Anat.) Above the angular bone; supra-angular; - applied to a bone of the lower jaw in many reptiles and birds.
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The specimen was identified as an incomplete bone, known as a surangular, from the lower jaw of an ichthyosaur by experts Dean Lomax, of the University of Manchester, and Professor Judy Massare of Brockport College, New York.
Posteriorly, the angular forms progressively more of the mandibular ramus ventrally, contacting the surangular laterally, and forming the floor of Meckel's canal dorsally (Figure 6 b).
Abbreviations: a, angular; ar, articular; d, dentary; en, external naris; f, frontal; j, jugal; la, lacrimal; mx, maxilla; pmx, premaxilla; pof, postfrontal; prf, prefrontal; pt, pterygoid; q, quadrate; rap, retroarticular process; sa, surangular; sq, squamosal.
In relation to the dermatocranium, other bony elements start to ossify; these include the prefrontal, the frontal, the parietal, the supratemporal, the palatine, the dentary and the surangular (Table 2).
Los huesos restantes son el surangular, el angular, el esplenico y el prearticular.
The lower jaw was almost completely made up of dentary bone; other minor components included the angular, surangular, and articular bones.
Se distinguen un segmento posterior del surangular, una parte de la superficie medial del prearticular y la region dorsal del articular.
a, angular; art, articular; bo, basioccipital; d, dentary; ect, ectopterygoid; f, frontal; j, jugal; l, lacrimal; mcg, meckelian groove; mx, maxilla; n, nasal; op, opisthotic; p, parietal; pal, palatine; pf, postfrontal; pmx, premaxilla; po, postorbital; pp, postparietal; pro, prootic; prf, prefrontal; pbs, parabasisphenoid; pt, pterygoid; q, quadrate, qj, quadratojugal; so, supraoccipital; sp, splenial; sq, squamosal; st, supratemporal; sa, surangular; ta, tabular; v, vomer
12533, 12534, 12535, 12537, 12538, 12546, 12550, 12551, 12553, 12555, 12557, 12562, 12565, 12566, 12571, 12572, 12574, 12575, 12579, 12582, 12585, 12588, 12590, 12595, 12596; 33 left dentaries, GCVP 12532, 12536, 12539, 12540, 12541-12545, 12547, 12549, 12552, 12554, 12556, 12558, 12559-12561, 12563, 2564, 12567, 12568, 12573, 12576-12578, 12580, 12581, 12587, 12592-12594, 12597; 36 parietals, GCVP 12496-12531; 26 frontals, GCVP 12705-12730; 91 squamosals, GCVP 12598-12688; 11 surangulars, GCVP 12694-12704; 5 jugals, GCVP 12689-12693.