Azpelicueta et al.—Kooiichthys jono (Teleostei, Siluriformes)
797
Figure 7. Kooiichthys jono, n. gen. n. sp. (MPEF-PV 1613). (1) Right cleithrum, (2) right quadrate, (3) left preopercle, (4) right hypobranchials and basibranchial 3, (5) right interhyal, (6) anterior ceratohyal, posterior ceratohyal, and branchiostegal rays. Abbreviations: hb = hypobranchial; bb3 = basibranchial 3. Scale bars = 1 cm.
Figure 9. Kooiichthys jono, n. gen. n. sp. (MPEF-PV 1613). Lateral view of the basioccipital, Weberian apparatus, and the fifth vertebra. Abbreviations: boc = basioccipital; cv = complex centrum of Weberian apparatus; v1 = vertebra 1; v5 = vertebra 5. Scale bar = 1 cm.
According to the sockets, teeth were not arranged in rows
and there are about 10/11 teeth from the labial to lingual edges near the symphyseal area. There are fewer teeth distally. The maxilla is toothed and double headed. However, compared with that of Diplomystes, Hypsidoris, and Bachmannia and the morphology of the fragment, a relatively long portion of bone is missing. Actually it probably surpassed the level of lateral ethmoid. The anterior articular process is long and stouter than Diplomystes. There are some longitudinal striae in the outer face. A few teeth were preserved. According to the sockets, the maxilla bears about five or six teeth from the labial to lingual edges close to the symphysis. There is a lower number of teeth distally (three or four).
Figure 8. Kooiichthys jono, n. gen. n. sp. (MPEF-PV 1613). (1) Dorsal view of parurohyal, (2) ventral view of parurohyal, (3) lateral view of parurohyal and dorsal and ventral hypohyals. Scale bars = 1 cm.
tubular in shape and the other is crescent-like and laminar; this latter bears the sensory canal close to the upper edge.
Upper Jaw.—The premaxilla is rectangular (Figs. 4.2, 5.5). It is slightly wider by the symphysis. The dorsal surface is slightly concave. It connects posteriorly with the maxilla. Most teeth are not preserved in position. Teeth are conic and elongated (longest: 5.2 mm).
Lower jaw.—The lower jaw is relatively long and stout (Figs. 5.4, 6). The coronoid process is slightly posterior to the middle of the jaw. The dentary is long and relatively deep. The oclusal face is flat and wide. The ventral part of the bone is compressed. There are three elongated pores of the sensory canal near the lower edge. Teeth are not arranged in rows and there are about nine/ten teeth from the labial to lingual edges near the symphyseal area. The angular+articular +retroarticular complex is long. The coronoid process appears to have been relatively low (perhaps 1:3 in total jaw length). The complex is externally ornamented with anteroposteriorly directed ridges. The articular surface for the quadrate is oval and transversally wide. The retroarticular is triangular and part of the upper suture
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