Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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164 Yoshitaka Yabumoto PREM DEN 10mm CRA Fig. 42. Aokiichthys otai gen. et sp. nov., head region of the holotype, KMNH VP 100,173. and second excavations of the Cretaceous fish fossils in Kitakyushu City. Locality. Tokuriki (TO-1), Kokura-minami-ku (Kokura Southern Ward), Kitakyu shu City, Fukuoka Prefecture, Japan. Horizon. The First Formation (the lower formation, W,, correlated to the Sengoku Formation) ofthe Wakino Subgroup in the Kwanmon Group, the Lower Cretaceous. Description of the holotype. The body is deep. The body depth is contained 2.3 times in the standard length. The head length is contained 3.6 times in the standard length. The snout is rounded. The outline of the head dorsal margin is slightly convex. The outline from the occipital region to the dorsal origin is slightly convex (Fig. 40). The restored outline of the abdomen is convex, and runs little under the lower end of each rib (Fig. 41). The median fins are relatively posterior in position. The dorsal
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 165 PARH HYU1 5mm Fig. 43. Aokiichthys otaigen. et sp. nov., caudal region of the holotype, KMNH VP 100,173. origin is vertical with the anal origin. The first dorsal fin pterygiophore is inserted between the first and second caudal vertebrae. The dorsal fin base is contained 1.9 times in the anal fin base. The pectoral fin elongates and extends over the pelvic insertion. The caudal fin is emarginate. The number ofprincipal dorsal fin rays is 11. There are 11 dorsal fin pterygiophores. The number ofprincipal anal fin rays is 19. There are 19 anal fin pterygiophores. The principal dorsal and anal fin rays are preceded by two small unbranched accessory rays respectively. Sixteen pectoral fin rays arevisible. Six pelvic fin rays are visible. There are 17 principal caudal fin rays (1,7,8,1). The gape of the mouth is large. The lower jaw is long and narrow. The dentary bears small canine like teeth on its oral margin. The suture between the dentary and anglo-articular is not visible and the posterior part ofthe lower jaw is poor in preservation. The premaxilla and maxilla bear small canine like teeth. Three large teeth are visible on the parasphenoid. The parasphenoid teeth are larger than the premaxillary, maxillary and dentary teeth. The premaxillary and maxillary teeth are slightly larger than the dentary teeth. Seven branchiostegal rays are visible (Fig. 42). The cleithrum is wide and has two ridges at the upper part.
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Bull. Kitakyushu Mus. Nat. Hist., 1
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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