Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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242 Yoshitaka Yabumoto Table9. Faunal comparison between the Wakino Subgroup and the Early Cretaceous beds of southeastern China Southeastern China The First Formation (W|) The Third Formation (W3) The Fourth Formation (\V4) OSTEICHTHYES ACTINOPERYG1I Order Semionotiformes Family Semionotidae Ncotepidotts yungkangensis Sinolepidotes chekiangensis Lepidotes macropterus Order Amiiformes Family Amiidae Sinamia kuananensis Nipponamia satoi Ikechaoamia meridionalis TELEOSTEI Order "Leptolcpiformes" Family "Leptolepidae" Pingolepis polyurocentralis Fuckunkiangia chesiensis Order Ichthyodectiformes Family Chuhsiungichthiidae Mesoclupea shoivchangensis Chuhsiwigichtrhys tsanglingensis Order Osteoglossiformes Family Lycopteridae Paralycoptera wui Yungkangichthys hsitanensis Family PHyodontidae Chetungichthys brevicephalus Chuhsiungichthys yanagidai Aokiichthys toriyamai Aokiichthys changae Aokiichthys otai Aokiichthys uyenoi Aokiichthys praedorsalis Aokiichthys sp. Chuhsiungichthys sp. Chuhsiungichthys japonicus Yungkangichthys macrodon Family Wakinoichthiidae Wakinoichthys aokii Wakinoichthys aokii Wakinoichthys robustus Order Ellimmichthtilbrmes Family Ellimmichthyidac Paractupea chetungensis Order Clupeiformes Family Clupeidae Diplomystus primotinus Diplomystus kokuraensis Diplomystus altisomus Diplomystus sp. Order.... Family Huashiidae Huashia gracilis Order and family incertae sedis Paraleptolepis kikuchii Paraleptolepis elegans Gonorynchiformes? incertae sedis
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 243 Province and the Mesoclupea-Huaskia fauna in the Zhejiang Province at the early stage of Early Cretaceous, and Paralycoplera-Tonghuaichlhys-Huashia fauna in the Jiling Prov ince and the Paralycoptera-Pingolepis-Huashia fauna in the Zhejiang Province at the early to middle stage of the Early Cretaceous. The Nipponamia-Aokiichthys fauna is related to the faunas of the early to middle stage of Early Cretaceous in China on the basis of its resemblance in composition. Paraleptolepis-Wakinoichthys fauna has a family, Chuhsiungichthiidae, in common with the Mesoclupea assemblage, but there is no similarity between the fauna at the level of genera and species. Diplomystus-Wakinoichthys fauna has a genus, Yungkangich thys, in common with the Mesoclupea assemblage, but other members are quite different. The Paraleptolepis-Wakinoichthys and Diplomystus-Wakinoichthys faunas differ from the Mesoclupea assemblage (Tab. 9). The Paraleptolepis-Wakinoichthys and Di plomystus-Wakinoichthys faunas are considered to be endemic. Comparison with other Cretaceous freshwater fish faunas in the world. There are several freshwater fish faunas from the Lower Cretaceous in the world. In Spain, nineteen species belonging to 13 families and 10 orders are described from the Lower Cretaceous sediments of Las Hoyas and Montsec (Poyato-Ariza and Wenz, 1990; Sanz et al., 1988). The family Amiidae and the genus Lepidotes are common to the Las Hoyas and Montesech fauna and the Wakino fish fauna. The elasmobranch order Hybodontiformes, the primitive halecostome orders Pycnodontiformes and Macrosemiiformes, the primitive teleostean orders Pholidophoriformes and Elopiformes, and Coelacanthiformes are present in the Las Hoyas and Montsec fauna, but they are absent in the Wakino fish fauna. The orders Ichthyodecti formes, Osteoglossiformes and Clupeiformes are present in the Wakino fish fauna, but they are absent in the Las Hoyas and Montsec fish fauna. The Wealden freshwater fish fauna in Belgium has an order, Amiiformes, and a genus, Lepidotes, common to the Wakino fish fauna. But the Wealden fish fauna is characterized by the existence of the chondrostean family Coccolepididae and an abundance of amiiform fish in number of species (Traquair, 1911). The order Osteoglossiformes which is abundant in the Wakino fish fauna is absent in the Wealden fauna. The fish fauna of Koonwarra in Australia is composedof 6 species belonging to 5 families and 5 orders (Waldman, 1971). The order Clupeiformes is common to the Koonwarra fish fauna and the Wakino fish fauna. However, the chondrostean family Coccolepididae and the primitive teleostean order Pholidophoriformes are present in the Koonwarra fauna and the existence of the lungfish family Ceratodontidae is characteristic of the Koonwarra fauna. These families and orders are absent in the Wakino fish fauna. The order Osteoglossiformes is absent in the Koonwarra fauna. The fish fauna of the Cocobeach Series of Gabon and Equatorial Guinea in
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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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Fig. 37. Aokiichthys changae gen. e
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10mm Fig. 52. Wakinoichthys aokii g
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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