Protozoa - Nassellaria - Ultranaporidae

Named by R. S. Hori.

Original description: Cephalis small and spherical with a long horn; horn triradiate or solid circular in axial section. Thorax large and spherical with fairly regularly arranged polygonal pore frames, a circular aperture and two long feet. Feet asymmetrical, straight or sometimes curving outward distally. Feet thin, blade-like in axial section proximally terminating with a solid spine.

Original remarks: This species is distinguished from all other species of Bipedis by having a large almost spherical thorax. It is similar to Bipedis hannai Whalen and Carter 1998, but differs by having longer feet, a longer stout horn and larger shell. B. yaoi Hori n. sp. differs from Bipedis japonicus Hori n. sp. and B. horiae Sugiyama 1997 by having thin feet that are circular in cross section terminally, and a small circular aperture.

Etymology: This species is named in honor of Akira Yao for his pioneering works on Lower Jurassic radiolarian fossils.

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 japonicus, Bipedis patricki, Bipedis rotundus, Bipedis triassicus, Parabipedis pessagnoi

Type specimen: IYII24-28 (pl.BPD16, fig. 1). Its type locality is Iwayakannon (IY) Section, Inuyama, IYII24, which is in a Sinemurian/Pliensbachian marine chert/mudstone in Japan.

Ecology: passively mobile planktonic omnivore

Distribution:

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Specimen images are retrieved through the ePANDDA API.