Azpelicueta et al.—Kooiichthys jono (Teleostei, Siluriformes)


795


Figure 5. Kooiichthys jono, n. gen. n. sp. (MPEF-PV 1613). (1) Photograph of right lateral view, (2) line drawing, (3) right autopalatine and palatine tooth plate, (4) internal view of right angular+articular+retroarticular with coronomeckelian bone, (5) dorsal and ventral view of right premaxilla and maxilla. Abbreviations: ld = left dentary; orb = orbitosphenoid; pter = pterosphenoid. Other abbreviations as in Figure 3. Scale bar = 1 cm.


and the two prootics. The mesethmoid is short, and presents a short and broad neck. The cornua are stout, well developed, and with a very shallow anterior cleft (Figs. 3, 4). The mesial lamina is deep and flat. The contact with frontal is straight. The mesethmoid reaches the anterior part of anterior cranial fontanelle. A complete right and a fragment of left nasals are preserved. The bone is relatively short and broad (Fig. 5, 6). The lateral ethmoid is relatively deep and stout. Posteriorly it articulates with the orbitosphenoid. In dorsal view, it is almost covered by the frontal; only the anterior margin is exposed (Fig. 3). The exit for the olfactory nerve opens in the middle of the anterior surface. Ventrally it has a contact with


parasphenoid. The preserved portion of the frontal is stout and flat. The anterior lateral portion is very thick (Figs. 5, 6). The suture with the mesethmoid is curved and smooth. The orbital


margin is broken. The anterior fontanelle is large and the epiphyseal bar is long. The anterior edge of the posterior fontanelle suggests that it was also large (Fig. 3). The right sphenotic is fragmentary but an anterior spine is clearly seen forming the dorsal flat surface of neurocranium. There is no evidence of origin of muscles on skull roof. The suture with the frontal is straight. The anterior part of the vomer is rhomboidal; the posterior shaft is very short. There are two separated vomerine toothed patches joined in the middle by means of a straight suture (Fig. 4.1, 4.2). The teeth are villiform, long and narrow, slightly curved, pointed, with a distal enameloid cap (Fig. 5.3). The orbitosphenoid is somewhat rectangular and anteroposteriorly elongate (Figs. 5, 6). It is not as deep as in Diplomystidae orBachmannidae. It sutures dorsally and posteriorly with the frontal, anteriorly with lateral ethmoid, ventrally with


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