Tristeirostoma saxaquadrata, DeVries, 2019

DeVries, Thomas J., 2019, Early Paleogene brackish-water molluscs from the Caballas Formation of the East Pisco Basin (Southern Peru), Journal of Natural History 53 (25), pp. 1533-1584 : 1574

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.

Figures

Figure 5. Gastropods from the Caballas Formation. (a–e) Caballasea segmentata gen. nov., sp. nov. B8769. (a) UWBM 107607, paratype, L 12.4 mm, apertural view. (b) UWBM 107607, abapertural view. (c) UWBM 107606, holotype, L 12.6 mm, abapertural view. (d) MUSM INV 262, paratype, L 8.3 mm, oblique view of parietal callus and columella. (e) UWBM 107608, paratype, L 15.3 mm, abapertural view. (f, g) Turritella capistrata sp. nov. (f) MUSM INV 259, paratype, B8772, L 16.3 mm, lateral view. (g) UWBM 107601, holotype, B8770, L 14.4 mm, apertural view. (h) Turritella saposa Olsson, 1944, UWBM 107602, B8770, L 15.5 mm. (i) Cristispira caballasensis sp. nov., UWBM 107605, holotype, B8769, L 5.1 mm, fragment. (j, k, m, n) Rhombopsis longinquus sp. nov. (j) UWBM 107630, holotype, B8772, L 18.3 mm, apertural view, outer lip missing. (k) MUSM INV 269, paratype, B8769, L 19.9 mm, abapertural view. (m) UWBM 107631, paratype, B8772, L 22.5 mm, abapertural view. (n) UWBM 107632, paratype, B8769, L 16.4 mm, lateral view of spire and columella. (l, o–q) Tristeirostoma saxaquadrata sp. nov. B8771. (l) UWBM 107636, paratype, L 10.0 mm, spire. (o) UWBM 107,635, holotype, L 7.6 mm, abapertural view. (p) UWBM 107635, lateral view of columella. (q) UWBM 107635, apertural/lateral view.