| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Xiphostylus simplus
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.
| Year | Name and author |
|---|---|
| 1987 | Xiphostylus simplus Yeh p. 52 figs. Pl. 10, fig. 7; Pl. 22, fig. 4 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.