Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

130 Yoshitaka Yabumoto
otp
Fig. 16. The suspensorium of Sinamia zdanskyi Stensio, 1937. From Stensio, 1937. An
arrow indicates the part between the condyles of the hyomandibular for the ncurocanium
and the opercular process.
Subdivision Teleostei
Order Ichthyodectiformes
Family Chuhsiungichthiidae nov.
Diagnosis. It differs from other families of the Ichthyodectiformes in the combina
tion of following characters. The body depth is moderate. The body depth is
contained 2.3 to 3.7 times in the standard length. The head is large and the length
of the head is contained 2.9 to 4.0 times in the standard length. The number of
dorsal fin 14 to 25. The number ofanal fin is 32 to 46. The number of vertebrae is
40 to 54. The anterior uroneurals cover the ural centra and the first preural
centrum. The median fins are posterior in position. The anal fin base is long.
Two genera, Chuhsiungichthys and Mesoclupea, belong to this new family.
Genus Chuhsiungichthys Lew, 1974
Diagnosis. This genus differs from the other genus, Mesoclupea, of the new family
Chuhsiungichthiidae in having the combination of following characters. The dorsal
origin is slightly before the anal origin. The dorsal fin base is relatively long and its
length is contained 1.4 to 1.9 times in the anal fin base. The number of dorsal fin
rays is 20 to 25. The number of vertebrae is 40 to 42.
Type species. Chuhsiungichthys tsanglingensis Lew, 1974.
Remarks.
The genus Chuhsiungichthys contains three species, C. tsanglingensis Lew,