Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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194 Yoshitaka Yabumoto PREM PREO V^ "*v_, 5mm Fig.62. 100,188. Wakinoichthys robustus gen. et sp. nov., head region of the holotype, KMNH VP rays are visible. Five pelvic fin rays are visible. There are 18 principal caudal fin rays (1,8,8,1). The gape of the mouth is large. The anterior part of the lower jaw is missing. The suture between the dentary and anglo-articular is not visible and the posterior part of the lower jaw is poorly preserved. The premaxilla bears small canine like teeth. The posterior end of the lower jaw is placed below almost center of the orbit. There are villiform teeth on the endopterygoid. The endopterygoid is large (Fig. 62). The total number of vertebrae is 45, with 22 caudal vertebrae. The anterior end of the vertebral column is not visible. vertebrae was estimated on the basis of the number of ribs. The number of abdominal The number of ribs is 21. There is a series of median supraneurals beginning immediately behind the head and ending above the first caudal vertebra. Each supraneural is wide and leaf-shape with a ridge running from a dorsal end to a ventral end. The first preural centrum bears the narrow parhypural (Fig. 63). Description of the paratypes. In KMNH VP 100,189, the body depth is contained 3.5 times in the standard length. The head length is contained 3.2 times in the standard length. The first dorsal fin pterygiophore is inserted between the fifth and the sixth caudal vertebrae. The dorsal fin base is contained 2.4 times in the anal fin base. The number of
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 195 N$v^ HYU Fig. 63. 100,188. Wakinoichthys robustus gen. et sp. nov., caudal skeleton of the holotype, KMNH VP principal dorsal fin rays is 10. There are 11 dorsal fin pterygiophores. The number of principal anal fin rays is 19. There are 19 anal fin pterygiophores. The principal dorsal fin rays are preceded by two small unbranched accessory rays. The principal anal fin rays are preceded by four small unbranched accessory rays. The total number of vertebrae is 47, with 22 caudal vertebrae. The number of ribs is 23. In KMNH VP 100,190, the first dorsal fin pterygiophore is between the sixth and the seventh caudal vertebra. The numberof principal dorsal fin rays is over 10. The number of dorsal fin pterygiophores is over 10. The number of principal anal fin rays is over 10. The number of anal fin pterygiophores is over 10. The principal dorsal fin rays are preceded by two small unbranched accessory rays. The principal anal fin rays are preceded by four small unbranched accessory rays. Villiform teeth are present on the endopterygoid. The number of caudal vertebrae is 26. The number of ribs is 24. The sagitta is large and round. In KMNH VP 100,191, the first dorsal fin pterygiophore is inserted between the sixth and seventh caudal vertebrae. The dorsal fin base is contained 2.7 times in the anal fin base. There are 11 dorsal fin pterygiophores. There are 22 anal fin pterygiophores. The number of caudal vertebrae is 22. Remarks. This new species, Wakinoichthys robustus is close to W. aokii in having almost same meristic characters, the position of median fins, the form of median supraneurals and the long pectoral fin. But it differs from W. aokii in the proportion. The body depth of W. robustus is deeper than that of W. aokii. The depth is contained 3.5 to 3.8 times in the standard length in W. robustus, 4.5 to 6.4 times in W. aokii
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Bull. Kitakyushu Mus. Nat. Hist., 1
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Early Cretaceous Freshwater Fish Fa
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Fig. 10. Nipponamia satoi gen. et s
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Early Cretaceous Freshwater Fisli F
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Fig. 19. Chuhsiungichthys yanagidai
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40-42 2.9 Early Cretaceous Freshwat
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Yabumoto, Y. Early Cretaceous Fresh
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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