Original description: Test conical, short, with two post-abdominal chamber, without circumferential ridges. Cephalis small, dome-shaped, without horn. Cephalis, thorax, and abdomen closely spaced, sparsely perforate, covered with layer of microgranular silica. Post-abdominal chamber consisting of single layer of pentagonal and hexagonal pore frames. Pore frames increasing in size distally. Bulbous expansion large, subspherical in outline, comprised of nearly two thirds of whole test.

Original remarks: Pseudoristola obesa differs from other Pseudoristola spp. in this report by having an extremely short test with a very large bulbous subspherical final post-abdominal chamber.

Etymology: Obesus-a-um (Latin, adj.) fat. Original description: Test conical, short, with two post-abdominal chamber, without circumferential ridges. Cephalis small, dome-shaped, without horn. Cephalis, thorax, and abdomen closely spaced, sparsely perforate, covered with layer of microgranular silica. Post-abdominal chamber consisting of single layer of pentagonal and hexagonal pore frames. Pore frames increasing in size distally. Bulbous expansion large, subspherical in outline, comprised of nearly two thirds of whole test.

Original remarks: Pseudoristola obesa differs from other Pseudoristola spp. in this report by having an extremely short test with a very large bulbous subspherical final post-abdominal chamber.

Etymology: Obesus-a-um (Latin, adj.) fat. Original description: Test conical, short, with two post-abdominal chamber, without circumferential ridges. Cephalis small, dome-shaped, without horn. Cephalis, thorax, and abdomen closely spaced, sparsely perforate, covered with layer of microgranular silica. Post-abdominal chamber consisting of single layer of pentagonal and hexagonal pore frames. Pore frames increasing in size distally. Bulbous expansion large, subspherical in outline, comprised of nearly two thirds of whole test.

Original remarks: Pseudoristola obesa differs from other Pseudoristola spp. in this report by having an extremely short test with a very large bulbous subspherical final post-abdominal chamber.

Etymology: Obesus-a-um (Latin, adj.) fat. Original description: Test conical, short, with two post-abdominal chamber, without circumferential ridges. Cephalis small, dome-shaped, without horn. Cephalis, thorax, and abdomen closely spaced, sparsely perforate, covered with layer of microgranular

silica. Post-abdominal chamber consisting of single layer of pentagonal and hexagonal pore frames. Pore frames increasing in size distally. Bulbous expansion large, subspherical in outline, comprised of nearly two thirds of whole test.

Original remarks: Pseudoristola obesa differs from other Pseudoristola spp. in this report by having an extremely short test with a very large bulbous subspherical final post-abdominal chamber.

Etymology: Obesus-a-um (Latin, adj.) fat. Original description: Test conical, short, with two post-abdominal chamber, without circumferential ridges. Cephalis small, dome-shaped, without horn. Cephalis, thorax, and abdomen closely spaced, sparsely perforate, covered with layer of microgranular silica. Post-abdominal chamber consisting of single layer of pentagonal and hexagonal pore frames. Pore frames increasing in size distally. Bulbous expansion large, subspherical in outline, comprised of nearly two thirds of whole test.

Original remarks: Pseudoristola obesa differs from other Pseudoristola spp. in this report by having an extremely short test with a very large bulbous subspherical final post-abdominal chamber.

Etymology: Obesus-a-um (Latin, adj.) fat.

Pseudoristola obesa was named by Yeh (1987). Its type specimen is NMNS (0001555) and is a 3D body fossil. Its type locality is Suplee-Izee area, OR-600A, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.

It was recombined as Stichocapsa obesa by Gawlick (2001); it was recombined as Lantus obesus by O'Dogherty and Gawlick (2008).