Protozoa - Actinommacea - Xiphostylidae
Original description: Test large, spherical in outline, with two polar spines unequal in length. One spine long and massive, triradiate with three rounded ridges alternating with three wide grooves; ridges and grooves displaying slight torsion. One polar spine extremely short and pointed in nature. Test comprised of regularly sized pentagonal and hexagonal pore frames. Pore frames thin in rims and thick in sides with numerous laminations superimposed on each pore frame (plate 22, figure 4).
Original remarks: This form is characterized by having a large spherical test with one extremely short polar spine and one long, massive polar spine.
Etymology: Simplus-a-um (Latin, adj.) simple.
Full reference: K. Y. Yeh. 1987. Taxonomic Studies of Lower Jurassic Radiolaria from East-Central Oregon. National Museum of Natural Science Special Publications 2:1-169
Belongs to Xiphostylus according to K. Y. Yeh 1987
Sister taxa: Xiphostylus ardea, Xiphostylus asper, Xiphostylus communis, Xiphostylus duvalensis, Xiphostylus fragilis, Xiphostylus gasquetensis, Xiphostylus halli, Xiphostylus inclinatus, Xiphostylus logdellensis, Xiphostylus whalenae
Type specimen: NMNS (000063). Its type locality is Suplee-Izee area, OR-600M, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.
Ecology: passively mobile planktonic omnivore
Distribution:
• Jurassic of Canada (1: British Columbia collection), Japan (1), Slovenia (4), Spain (1), United States (2: Oregon)
Total: 9 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
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