Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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158 Yoshitaka Yabumoto DEN CRA Fig. 38. Aokiichthys changae gen. et sp. nov., head region of the holotype, KMNH VP 100,166. exposed. The standard length is 69.7 mm. KMNH VP 100,168, an almost com plete specimen with its left side exposed, but the pelvic fin is missing. The standard length is 76.1 mm. KMNH VP 100,169, an almost complete specimen with its left side exposed. The standard length is 83.1 mm. KMNH VP 100,170, an almost complete specimen with its left side exposed, but the posterior end of the caudal fin is missing. The standard length is 62.5 mm. KMNH VP 100,171, an almost com plete specimen with its right side exposed, but the posterior part of the caudal fin is missing. The standard length is 70.5 mm. Locality. Tokuriki (TO-1), Kokura-minami-ku (Kokura Southern Ward), Kitakyu shu City, Fukuoka Prefecture, Japan. Horizon. The First Formation (the lower formation, Wj, correlated to the Sengoku Formation) of the Wakino Subgroup in the Kwanmon Group, the Lower Cretaceous. Etymology. The species is named for Dr. Chang Mee-mann, a paleontologist of China who has contributed to the study of the Mesozoic fish fossils in China.
Early Cretaceous Freshwater Fish Fauna in Kyushu,Japan 159 Description of the holotype. The body is moderate. The body depth is contained 3.5 times in the standard length. The head length is contained 3.8 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 almost straight (Fig. 36). The restored outline of the abdomen is almost straight and runs little under the lower end of each rib (Fig. 37). The median fins are relatively posterior in position. The dorsal origin is behind the anal origin and vertical with the fifth anal fin pterygiophore (about anterior one third of the anal base). The first dorsal fin pterygiophore is above the first and second caudal vertebrae. The dorsal fin base is contained 2.1 times in the anal fin base. The pectoral fin is moderate and reaches the pelvic insertion. The caudal fin is emarginate. The number of principal dorsal fin rays is 11. There are 12 dorsal fin pterygiophores. The number of principal 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. Seven pectoral 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 angulo-articular is not visible and the posterior part of the lower jaw is poor in preservation. The maxilla bears teeth almost entirely on its oral margin. The maxillary teeth are larger than the dentary teeth. The posterior end of the :3^ GS3 PARH 5mm Fig. 39. 100,166. Aokiichthys changae gen. et sp. nov., caudal region of the holotype, KMNH VP
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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