Description: Relatively large (typically >5 µm), triangular-shaped nannoliths that thicken along the longer sides and exhibit low birefringence in XPL.

Remarks: Similar to disaggregated Micrantholithus segments in LM but with a more acute angle between the longer edges (~50°-60°, compared to 72° for typical pentaliths). The c-axis orientation is similar to other pentaliths, i.e., tangential. The liths consist of a series of fine calcite laminae similar to other members of the Braarudosphaeraceae. May be disaggregated liths of Micrantholithus-type pentalith with a concave base.

Range: NP19 to NP21.

Holotype: Paratype: