Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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198 Yoshitaka Yabumoto 1mm Fig. 66. Diplomistus primotius Uyeno, 1979, head region of the holotype, KMNH VP 100,001. From Uyeno, 1979. Description of the holotype. The body is slender and the body depth is contained 4.2 times in the standard length. The head length is contained 3.4 times in the standard length. The dorsal fin is situated at about the middleof the body,and the pelvic fin, below the dorsal fin. The pectoral fin is situated near the ventral edge of the body at the posteroventral corner of the head. The number of dorsal fin pterygiophores is 12. The base of the anal fin is long with 24 pterygiophores. (The number of pterygiophores is usually equal to the number of principal dorsal or anal rays in the closely related Recent species, Hyperlophus vittatus Castelnau). Seven predorsal scutes are visible. The ventral scutes are well-developed and total 19 in number, with 11 scutes between the pectoral and pelvic fins, and 8 scutes between the pelvic and anal fins. The total number of vertebrae is 37, with 20 abdominal and 17 caudal vertebrae. Seven predorsal interneural spines are present. The neural spines ofthe first to the 15th vertebrae are divided into two. The intermuscular bones are well-developed, espe cially in the caudal region. The number of predorsal interneural spine is 7. At least 2 epurals are visible. One parhypural and 6 hypural bones are present. Description of additional specimens. In KMNH VP 100,192, the body depth is contained 4.1 times in the standard length. The head length is contained 3.7 times in the standard length. The number ofdorsal fin pterygiophores is 10. The number ofanal fin pterygiophores is
Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 199 1mm J A 1mm Fig. 67. Diplomistus primotius Uyeno, 1979. A, predorsal scutes oftheholotype, KMNH VP 100,001. B, predorsal scutes of KMNH VP100,006. From Uyeno, 1979 24. Seven predorsal scutes are visible. The number of ventral scutes is 17, with 9 scutes between the pectoral and pelvic fins, and 8 scutes between the pelvic and anal fins. The total number of vertebrae is 35, with 17 caudal vertebrae. The number of ribs is 16. The depth between the dorsal margin of the body and the abdominal vertebral column at the maximum depth of the body is contained 3.4 times in the depth between the abdominal vertebral column and the ventral margin of the body. In KMNH VP 100,193, the body depth is contained 3.8 times in the standard length. The head length is contained 3.7 times in the standard length. The number of dorsal fin rays is 10. The number of dorsal fin pterygiophores is 10. The number of anal fin rays is 25. Five predorsal scutes are visible. The ventral scutes are 18. The total number of vertebrae is 34, with 18 abdominal and 16 caudal vertebrae. The number of ribs is 16. The depth between the dorsal margin of the body and the abdominal vertebral column at the maximum depth of the body is contained 2.4 times in the depth between the abdominal vertebral column and the ventral margin of the body. In KMNH VP 100,194, the body depth is contained 4.4 times in the standard length. The head length is contained 3.8 times in the standard length. The number of dorsal fin rays is 10. The number of anal fin pterygiophores is over 22. Ten predorsal scutes are visible. The ventral scutes are total 17, with 10 scutes between the pectoral and pelvic fins, and 7 scutes between the pelvic and anal fins. There are 4 ventral scutes, which do not have vertical elements, under the coracoid. The total number of vertebrae is 34, with 18 abdominal and 16 caudal vertebrae. Thenumber ofribs is 16. Thedepth between the dorsal margin ofthe body and the
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Bull. Kitakyushu Mus. Nat. Hist., 1
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Early Cretaceous Freshwater Fish Fa
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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