Protozoa - Nassellaria - Ultranaporidae

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.

Full reference: S. Gorican, E. S. Carter, P. Dumitrica, P. A. Whalen, R. S. Hori, P. De Wever, L. O'Dogherty, A. Matsuoka, and J. Guex. 2006. Catalogue and systematics of Pliensbachian, Toarcian and Aalenian radiolarian genera and species 446

Belongs to Bipedis according to S. Gorican et al. 2006

Sister taxa: Bipedis acrostylus, Bipedis calvabovis, Bipedis diadema, Bipedis douglasi, Bipedis elizabethae, Bipedis fannini, Bipedis hannai, Bipedis helenae, Bipedis hiberniaensis, Bipedis patricki, Bipedis rotundus, Bipedis triassicus, Bipedis yaoi, Parabipedis pessagnoi

Type specimen: no.Kb05-18 (pl. BPD15, fig. 1). Its type locality is Katsuyama (UF) Section, Inuyama, Kb5, which is in a Jurassic basinal (siliceous) chert/shale in Japan.

Ecology: passively mobile planktonic omnivore

Distribution:

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Specimen images are retrieved through the ePANDDA API.