Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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212 Yoshitaka Yabumoto ventral end and has wings both sides of the ridge. The preopercle is L-shape. The sensory canal runs along the anterior margin of the upper limb and the dorsal margin of the lower limb. Five branches of the canal are visible from the corner to the anterior end of the lowerlimb. Four branchiostegal rays are visible. The opercleis visible (Fig. 75). The predorsal scutes are round in shape and their lengths are almost equal to their widths. The anterior and posterior ends of the scutes are round. Five predorsal scutes are visible. The ventral scutes are welldeveloped and total 17 in number, with 10 scutes between the pectoral and pelvic fins, and 7 scutes between the pelvic and anal fins. The total number of vertebrae is 34, with 16 caudal vertebrae (Fig. 73). The anterior end of the vertebral column is not visible. The number ofabdominal vertebrae was estimated on the basis of the number of ribs. The number of ribs is 16. Five median supraneurals are visible. The first preural centrum bears the cylindrical parhypural. The neural arch and spine of the first preural centrum are complete. The first hypural is the largest. The second hypu ral is about one fourth of the first one in width. There are two ural centra. The second ural centrum bears at least three hypurals. Two uroneurals are visible. The number of epurals is 3. There is a caudal scute before the procurrent caudal fin rays of the lower lobe (Fig. 76). Fig. 76. Diplomystus altisomus sp. nov., caudal skeleton of the holotype, KMNH VP 100,217.
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 213 PTP1 MAX-4K ECP 5mm Fig. 77. Diplomystus altisomus sp. nov., anterior part ofthe body, KMNH VP 100,219. Description of the paratypes. In KMNH VP 100,218, the body depth is contained 2.5 times in the standard length. The head length is contained 3.7 times in the standard length. The dorsal fin base is short and is contained 1.8 times in the anal fin base. The number of principal dorsal fin rays is 10. The number ofprincipal anal fin rays is 23. There are 23 anal fin pterygiophores. Ten predorsal scutes are visible. The ventral scutes are well developed and total 17 in number, with 10 scutes between the pectoral and pelvic fins, and 7 scutes between the pelvic and anal fins. The total number of vertebrae is 35, with 16 caudal vertebrae. The number of ribs is 17. In KMNH VP 100,219, the number of principal dorsal fin rays is 12. There are 12 dorsal fin pterygiophores. Four predorsal scutes are visible (Fig. 77). The ventral scutes are well developed and total 20 in number, with 10 scutes between the pectoral and pelvic fins, and 8 scutes between the pelvic and anal fins. The total number of vertebrae is 20, with 16 caudal vertebrae. The number of ribs is 18. Seven median supraneurals are present. In KMNH VP 100,220, the body depth is contained 1.9 times in the standard
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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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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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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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