. Bulletin of the British Museum (Natural History), Geology. LOWER DEVONIAN FISHES FROM SAUDI ARABIA 31. Figs 4-5 Wajidosteus minutus gen. et sp. nov. 4, ventral view of part of ventral trunk armour, based on P62831. Sp - spinal, Int - intero-lateral, Avl - anterior ventrolateral. 5, Anterior dorso-lateral ; a inner, b outer views. Holotype P62836a, b. - lateral line groove. (See also Fig. 22). Fig. 6 cf. Elegantaspis. Ventral trunk armour, scattered head plate and scales. P62837. Sp - spinal, Avl - anterior ventro-lateral, Pvl - posterior ventrolateral, Sc - scale. Fig. 7 Phoebodus sp. to
. Bulletin of the British Museum (Natural History), Geology. LOWER DEVONIAN FISHES FROM SAUDI ARABIA 31. Figs 4-5 Wajidosteus minutus gen. et sp. nov. 4, ventral view of part of ventral trunk armour, based on P62831. Sp - spinal, Int - intero-lateral, Avl - anterior ventrolateral. 5, Anterior dorso-lateral ; a inner, b outer views. Holotype P62836a, b. - lateral line groove. (See also Fig. 22). Fig. 6 cf. Elegantaspis. Ventral trunk armour, scattered head plate and scales. P62837. Sp - spinal, Avl - anterior ventro-lateral, Pvl - posterior ventrolateral, Sc - scale. Fig. 7 Phoebodus sp. tooth P62874, tips of lateral cusps restored. Fig. 8 Ischnacanthid symphysial tooth whorl. P62867. Fig. 9 cf. Onychodus anglicus Woodward. Tooth whorl. P62853. •>y Goujet (1984: fig. 63). Others (P62839 and P62840) are ALs, 18 mm and 22 mm deep but otherwise similar in shape o those of Wajidosteus. Two further specimens are long, offin-shaped AMVs (P62842, P62846a, b), much narrower han those seen in Wajidosteus. P62845a, b and P62848 are imilar shaped AVL plates, 22 mm and 34 mm long respec- ively and the spinal margin shows that the placoderm to yhich they belonged had very divergent spinals. P62841 is lso an AVL showing a divergent spinal margin but it is lightly more elongate. Lelievre (1989) described the central late of a buchanosteid arthrodire from the Jauf Formation, here are plates with buchanosteid type ornament pattern in the present collection although we have been unable to identify them further. Turner (in Boucot et al. 1989) recorded the occurrence of placoderm scales within a sample from the Jauf Formation and compared them with those of Stensioella. We have recovered more such scales from sample number 17 (P62958-60) and they are illustrated in Figs 16-18. Generally the scales are small, conical with a rough uneven surface of ridges, depressions and sometimes tubercles. The lower sur- face is deeply concave. Some are similar to those identified by Turner, o
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