Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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— 6-10 202 Yoshitaka Yabumoto Table 5. Comparison of characters in the species of the genus Diplomystus. Diplomystus primotinus D. kokuraensis D. allisomus sp. nov. D. sp. counts D. 11-12 11-12 1.9-2.5 11 D. pterygiophore 11-12 11-12 10-12 10-12 A. 24-25 20-27 23-24 22-25 A. pterygiophore 24-25 20-27 23-24 22-25 Vertebrae 36-37 (19-20+17) Predorsal scutes — 33-36 (18-20+15-16) 34-36 (18-20+16) 34-36 (18-2+16) 5-7 Ventral scutes 10-11+7-8=18-19 9-10+8=17-18 10+7-8=17-18 iv+11+7-9 = 18-20 Supraneurals 7-8 7 7 6-7 ratio SL/BD 4.2 1.9 1.9-2.5 (2.0)3.2-3.7 SL/HL 3.4 3.4 3.6-3.7 3.2-3.9 AB/DB 1.3 1.2 1.8-2.1 1.8 other characters Angle of preopercle right •> right obtuse Ventral margin of abdomen slightly convex convex remarkably convex slightly convex A., anal fin rays; AB,anal fin base; BD,body depth; D.,dorsalfin rays; DB,dorsal fin base; HL, head length; SL, standard length. Additional specimens. KMNH VP 100,203, an almost complete specimen, with its right side exposed, but the caudal part of the body is poorly preserved. The standard length is 47.2 mm. KMNH VP 100,204, an almost complete specimen, with its right side exposed, but the part of the anal fin is missing. Bones of head region are moved. The standard length is 53.1 mm. KMNH VP 100,205, an almost complete specimen, with its left side exposed, but the anal fin and dorsal margin of the body in front of the dorsal origin are missing. The standard length is 42.9 mm. KMNH VP 100,206, an almost complete specimen, with its right side exposed, but the parts of the dorsal and anal fins are missing. The standard length is 49.7 mm. KMNH VP 100,207, an almost complete specimen, with its left side exposed, but a part of the anal fin and a part of the head region are missing. The standard length is 48.2 mm. KMNH VP 100,208, an almost complete specimen, with its right side exposed, but posterior parts of the anal and dorsal fins are missing. The standard length is 31.1 mm. KMNH VP 100,209, an almost complete speci men, with its right side exposed, but the dorsal margin of the body in front of dorsal fin is missing. Bones of the abdomen are slightly moved. The standard length is 47.2 mm. KMNH VP 100,210, an anterior part of the body with its right side exposed. The length from the snout to the anal origin is 49.7 mm.
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 203 10mm Fig.68. Diplomistus kokuraensis Uyeno, 1979, the holotype, KMNH VP 100,031. From Uyeno and Yabumoto, 1980. Fig. 69. Diplomistus kokuraensis Uyeno, 1979, restoration of the skeleton. Yabumoto, 1980. From Uyeno and 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) of the Wakino Subgroup in the Kwanmon Group, the Lower Cretaceous. The original description is as follows. Diagnosis. This species differs from other members of the genus in having the following characters. The predorsal scutes are round in shape and their lengths are almost equal to or shorter than their widths. The anterior and posterior ends of the scutes are round, as opposed to pointed or concave. The body depth is about half of the standard length. The head length is about one-third of the standard length.
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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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