Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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196 Yoshitaka Yabumoto (Tab. 4). The pectoral fin is long in both species, but it does not extend beyond the pelvic insertion in W. robustus, the pectoral fin extends beyond the pelvic insertion in W. aokii. Infradivision Clupeomorpha Order Clupeiformes Family Clupeidae Genus Diplomystus Cope, 1877 Diagnosis. See Grande (1982). The characteristics of the species from the Waki no Subgroup do not agree with the diagnosis by Grande (1982), but the present author tentatively leaves these species under the genus Diplomyslus until further comparison with other genera and species in detail. Type species. Diplomystus dentatus Cope, 1877. Diplomystusprimotinus Uyeno, 1979 (Figs. 64-67, PI. 53) Holotype. KMNH VP 100,001, an almost complete specimen, with its right side exposed, but the upper lobe of caudal fin is missing. The standard length is 63.0 Additional specimens. KMNH VP 100,192, an almost complete specimen, with its left side exposed, but bones of the head region is slightly moved. The standard length is 42.9 mm. KMNH VP 100,193, an almost complete specimen, with its right side exposed. The standard length is 46.6 mm. KMNH VP 100,194, an almost complete specimen, with its left side exposed. The standard length is 49.4 mm. KMNH VP 100,195, an almost complete specimen, with its right side exposed, but a part of the anal fin is missing. The standard length is 53.7 mm. KMNH VP 100,196, an almost complete specimen, with its left side exposed, but the dorsal margin in front of the dorsal fin is missing. The standard length is 31.7 mm. KMNH VP 100,198, an almost complete specimen, with its left side exposed, but a part of the anal fin is missing. The standard length is 51.4 mm. KMNH VP 100,199, an almost complete specimen, with its leftside exposed, but parts of the anal fin and the caudal vertebrae are missing. The standard length is 36.3 mm. KMNH VP 100,200, an almost complete specimen, with its right side exposed, but parts of the anal and dorsal fins are missing. The standard length is 47.3 mm. KMNH VP 100,201, an almost complete specimen, with its left side exposed, but a part of the anal fin is missing. The standard length is 69.6 mm. KMNH VP
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 197 10mm Fig. 64. Diplomistus primotius Uyeno, 1979, the holotype, KMNH VP 100,001. From Uyeno and Yabumoto, 1980. Fig. 65. Diplomistus primotius Uyeno, 1979, restoration of the skeleton. From Uyeno and Yabumoto, 1980. 100,202, an anterior part of the body, with its leftside exposed. The length from the pectoral insertion to the end of the hypural is 43.6 mm. Locality. Kumagai (KA-0), Kokura-kita-ku (Kokura Northern Ward), Kitakyushu City, Fukuoka Prefecture, Japan. Horizon. The Fourth Formation (the uppermost formation, W4, correlated to the Upper Wakamiya Formation) ofthe Wakino Subgroup in the Kwanmon Group, the Lower Cretaceous. The original description is as follows. Diagnosis. This new species differs from other members of the genus in having the following characters. The predorsal scutes are oval in shape with rounded anterior and posterior ends, as opposed to pointed or concave ends. The body depth is about one-fourth of the standard length. The head length is about one-third of the standard length. The number of dorsal pterygiophores is 11 to 12 and anal fin pterygiophores is 24 to 25. The total number of vertebrae is 37 with 20 abdominal and 17 caudal vertebrae. The number of ventral scutes is 18 to 19 in total, with 10 to 11 scutes between the pectoral and pelvic fins, and 7 to 9 scutes between the pelvic and anal fins. The number of predorsal interneural spines is 7.
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Bull. Kitakyushu Mus. Nat. Hist., 1
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Fig. 19. Chuhsiungichthys yanagidai
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40-42 2.9 Early Cretaceous Freshwat
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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