Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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228 Yoshitaka Yabumoto HYU7 PARH . HYU1 5mm Fig.89. 100,222 Paraleptolepis kikuchii gen. et sp. nov., caudal skeleton of the holotype, KMNH VP base. The number ofprincipal dorsal fin rays is 12. The number ofprincipal anal fin rays is 19. There are 19 anal fin pterygiophores. The principal anal fin rays are preceded by two small unbranched accessory rays. The total number of vertebrae is 42, with 20 caudal vertebrae. The number ofribs is 20. Remarks. This new species, Paraleptolepis kikuchii is close to Paraleptolepis elegans in the meristic characters and the characters of the head and caudal regions. But it differs from P. elegans in the proportion. The body depth is contained 3.2 to 3.7 times in the standard length in P. kikuchii, 4.7 to 5.5 times in P. elegans (Tab. 6). Paraleptolepis elegans sp. nov. (Figs. 90-93, Pis.58-59) Diagnosis. It differs from other species ofthe genus in having the combination of following characters. The body is slender. The body depth is contained 4.7 to 5.5 times in the standard length. The head length is contained 4.1 to 5.1 times in the standard length. The anterior three anal fin pterygiophores do not extend near the vertebral column. The first dorsal fin pterygiophore is above the neural spine of the first caudal vertebra. The number of vertebrae is 41 to 42, with 19 to 20 caudal
Early Cretaceous Freshwater Fish Fauna in Kyushu,Japan 229 Table 6. Comparison of charactersin the species of the new genus Paraleptolepis. Paraleptolepis kikuchii gen. et sp. nov. P. elegans gen et sp. nov. Counts D. 11-12 D. pterygiophore 10-12 A. 17-19 A. pterygiophore 17-19 P. 10-11 P2 5 C. 18 V. 40-42 (20--22 + 20-19) ribs 18-20 ratio 10-12 10-11 18-19 18-20 12 5-6 19 41-42 (22+19-20) 20 SL/BD 3.2-3.7 SL/HL 3.5-4.3 AB/DB 1.4-1.6 other character Size of pelvic fin small 4.7-5.5 4.1-5.1 4.5-2.5 middle A., anal fin rays; AB, anal fin base; BD, body depth; C, caudal fin rays; D., dorsal fin rays; DB, dorsl fin base; HL, head length; P,, pectoral fin rays; P2, pelvic fin rays; SL, standard length; V., vertebrae. vertebrae. The number of ribs is 20. Holotype. KMNH VP 100,227, an almost complete specimen with its right side exposed, but the posterior part of the caudal fin is missing. The standard length is 48.9 mm. Paratypes. KMNH VP 100,228, an almost complete specimen with its left side exposed, but the anterior part of the head region and the pelvic fin are missing. The length from the pelvic insertion to the posterior margin of the hypural is 30.3 mm. KMNH VP 100,229, an almost complete specimen with its right side exposed, but a part between the end of the dorsal fin base and the middle of the anal fin base is missing. The standard length is 41.0 mm. KMNH VP 100,230, an almost com plete specimen with its right side exposed, but the caudal bones are missing. The length from the snout to the posterior end of the first preural centrum is 35.6 mm. KMNH VP 100,231, an almost complete specimen with its right side exposed, but the anterior end of the head and the posterior part of the caudal fin are missing. Thestandard length is 58.8 mm. KMNH VP 100,232, an almost complete specimen with its right side exposed, but a part of the caudal region is missing. The standard
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Fig. 10. Nipponamia satoi gen. et s
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Fig. 19. Chuhsiungichthys yanagidai
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Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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