Early Cretaceous Freshwater Fish Fauna in Kyushu, Japan

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6-10
202 Yoshitaka Yabumoto
Table 5.
Comparison of characters in the species of the genus Diplomystus.
Diplomystus primotinus D. kokuraensis D. allisomus sp. nov. D. sp.
counts
D. 11-12 11-12 1.9-2.5 11
D. pterygiophore 11-12 11-12 10-12 10-12
A. 24-25 20-27 23-24 22-25
A. pterygiophore 24-25 20-27 23-24 22-25
Vertebrae 36-37
(19-20+17)
Predorsal scutes —
33-36
(18-20+15-16)
34-36
(18-20+16)
34-36
(18-2+16)
5-7
Ventral scutes 10-11+7-8=18-19 9-10+8=17-18 10+7-8=17-18 iv+11+7-9
= 18-20
Supraneurals 7-8 7 7 6-7
ratio
SL/BD 4.2 1.9 1.9-2.5 (2.0)3.2-3.7
SL/HL 3.4 3.4 3.6-3.7 3.2-3.9
AB/DB 1.3 1.2 1.8-2.1 1.8
other characters
Angle of preopercle right
•>
right obtuse
Ventral margin of
abdomen
slightly convex convex remarkably convex slightly convex
A., anal fin rays; AB,anal fin base; BD,body depth; D.,dorsalfin rays; DB,dorsal fin base; HL,
head length; SL, standard length.
Additional specimens. KMNH VP 100,203, an almost complete specimen, with its
right side exposed, but the caudal part of the body is poorly preserved. The
standard length is 47.2 mm. KMNH VP 100,204, an almost complete specimen,
with its right side exposed, but the part of the anal fin is missing. Bones of head
region are moved. The standard length is 53.1 mm. KMNH VP 100,205, an
almost complete specimen, with its left side exposed, but the anal fin and dorsal
margin of the body in front of the dorsal origin are missing. The standard length is
42.9 mm. KMNH VP 100,206, an almost complete specimen, with its right side
exposed, but the parts of the dorsal and anal fins are missing. The standard length
is 49.7 mm. KMNH VP 100,207, an almost complete specimen, with its left side
exposed, but a part of the anal fin and a part of the head region are missing. The
standard length is 48.2 mm. KMNH VP 100,208, an almost complete specimen,
with its right side exposed, but posterior parts of the anal and dorsal fins are missing.
The standard length is 31.1 mm. KMNH VP 100,209, an almost complete speci
men, with its right side exposed, but the dorsal margin of the body in front of dorsal
fin is missing. Bones of the abdomen are slightly moved. The standard length is
47.2 mm. KMNH VP 100,210, an anterior part of the body with its right side
exposed. The length from the snout to the anal origin is 49.7 mm.