Suborder: Frontoventral cirri as 2 or more zig-zag files almost full length of ventrum.

Unidentified sp. 180 x 56 μm Shirakawa Fukushima, 1999

Unidentified sp. 112 x 33 μm Saitama, 2000

Unidentified sp. 168 x 35 μm Yamagata, 1999