Original description: Test dicyrtid with large dome-shaped cephalis and a long massive horn, triradiate in axial section. Cephalis smooth, imperforate at base of horn. Thorax large, relatively inflated, subspherical with fairly regular polygonal pore frames. Two wing-like feet attached at base of thorax; feet inwardly curving, triradiate in axial section. Narrow longitudinal ridges and broad grooves visible along side of thorax for most part. Large aperture at base of thorax.

Original remarks: Bipedis sp. A of Hori (1990) was placed in synonymy with Bipedis horiae by Sugiyama (1997), but these two species are quite different in the shape of shell and feet. Bipedis sp. A of Hori (1990) is described herein as Bipedis japonicus n. sp., which is distinguished from Bipedis horiae Sugiyama by having very long stout feet and a strong horn. B. japonicus n. sp. differs from Bipedis rotundus Whalen and Carter by having long well-developed feet and horn, and a wider thorax with more regularly arranged pore frames.

Etymology: This species of Bipedis occurs mainly in Lower Jurassic strata of Japan.

Bipedis japonicus was named by Gorican et al. (2006). Its type specimen is no.Kb05-18 (pl. BPD15, fig. 1) and is a 3D body fossil. Its type locality is Katsuyama (UF) Section, Inuyama, Kb5, which is in a Jurassic basinal (siliceous) chert/shale in Japan.