[BPT06-P04] Fossil fish from the Lower Miocene Kamenoo Formation, the Yunagaya Group, in Northern Ibaraki prefecture
Keywords:Early Miocene, Kamenoo Formation, Fossil Fish
Fossil fish from the Kamenoo Formation are fossil fish scales (about 90) and 2 skeletons, which had been trying to identify.
Caudal fin and scales of this skeleton is well preserved. The skeleton belongs to the genus of Neoscopelidae because of the following characters: the scales is Myctophiformes like cycloid; there is a gap between second and third hypurals (HY); the width of third and forth hypurals are wide; and preural centrum1 and ural centrum1 fused (PU1+ U1); and the first hypural is articulated with PU1+U1. Neoscopelus sp. and Glossanodon sp. have these characteristics. But Glossanodon sp. have no scales cycloid. So it is considered Neoscopelidae.(Myctophiformes)
The Neoscopelidae is first record in the Miocene of the Kamenoo Formation. Recent taxa of Mycyophiformes is classed by head and photogenic organ. Consequently, it is necessary for osteology and comparison of recent taxa of the genus Neoscopelus sp. to study taxonomy.