Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan 177
anal fin rays and 16 pterygiophores. The pectoral fin reaches the pelvic insertion.
The first ray of pectoral fin is stout and long. The caudal fin is emarginate. The
number of branched caudal fin rays is 15 (1,7,8,1). The number of vertebrae is 36,
with 18 caudal vertebrae.
The anterior 10 vertebrae are small.
Description of the paratype.
In KMNH VP 100,156, nine long canine like teeth on the dentary are visible.
There are 7 teeth similar to the dentary teeth on the premaxilla. Four large canine
like teeth on the parasphenoid and the teeth are more stout than the dentary and the
premaxillary teeth. Eleven branchiostegal rays are visible. The number of pectoral
fin rays is 10. Sixteen ribs can be counted.
In KMNH VP 100,157, the body depth is contained 2.7 times in the standard
length. The head length is contained 3.6 times in the standard length. The dorsal
fin base is contained 2.0 times in the anal fin base. The number of principal dorsal
fin rays is 11. There are 11 dorsal fin pterygiophores. The number of principal
anal fin rays is 15. There are 15 anal fin pterygiophores. The total number of
vertebrae is 35, with 18 caudal vertebrae. The number of ribs is 15.
In KMNH VP 100,158, the body depth is contained 2.8 times in the standard
length. The head length is contained 3.5 times in the standard length. The dorsal
fin base is contained 1.7 times in the anal fin base. The number of principal anal fin
rays is 17. There are 17 anal fin pterygiophores. Nine pectoral fin rays are visible.
The total number of vertebrae is 35, with 18 caudal vertebrae.
is 15.
The number of ribs
Remarks. This new species differs from other species of the genus, Aokiichthys in
having the former position ofthe dorsal fin, the large dorsal fin, the largest number of
the dorsal fin rays and the fewest number of the anal fin rays. The anal origin is
behind the dorsal origin and about vertical with the 7th dorsal fin pterygiophore (the
middle of the dorsal base). The length of dorsal fin base is contained 1.2 times in
the length of anal fin base. The number of dorsal fin rays is 11 to 13. The number
of anal fin rays is 15 to 17. The standard length of the largest specimen, holotype is
146.7 mm. This is the largest in the genus Aokiichthys.
Aokiichthys sp.
(Fig. 51, PI. 49)
Specimen. KMNH VP 100,159, the anterior part of the body. The posterior part
of the abdomen and the caudal part of the body are missing.
Locality. Tokuriki (TO-1), Kokura-minami-ku (Kokura Southern Ward), Kitakyu
shu City, Fukuoka Prefecture, Japan.