Tristeirostoma saxaquadrata sp. nov.

(Figure 5 (l), 5(o – q))

Diagnosisı descriptionı and remarks

As for genus.

Etymology

‘ Saxaquadrata ’, Latin, meaning ‘ paving stones ’, referencing the axially and spirally aligned beads between axial ribs.

Material

B8771 (type locality). UWBM 107635, holotype, L (7.6), W (5.7); UWBM 107636, paratype, L (10.0), W (6.3)

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Occurrence

Lower Paleogene, Cuenca Member, Caballas Formation, East Pisco Basin, southern Peru.