Potamides henryi DeVries 2019, sp. nov.
Creators: name: DeVries, Thomas J.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Potamididae
Potamides
Potamides henryi

description: Potamides henryi sp. nov.
(Figure 4 (m – q))
Diagnosis
Shell with narrow spire. Whorls with four beaded primary spiral cords, posteriormost strongest; later whorls often with additional one to three beaded secondary spiral cords. Varices and ventrolateral varix absent. Columella with single fold.
Description
Estimated shell length 15 – 20 mm; elongate, spire slightly convex, spire angle about 16°. Protoconch poorly preserved. Spire with about eight whorls. Whorls flat-sided, sutures thinly incised, recessed. Earliest teleoconch whorls with three beaded spiral cords. Later whorls with four beaded spiral cords: posteriormost widest, adjacent to posterior suture, with axially elongate beads; anteriormost cord, nearly adjacent to suture, second widest, with spherical or spirally elongate oval beads; second cord from the anterior suture third widest, with small, partly separated spherical beads; and second cord from the posterior margin most narrow, with separated spirally elongate oval beads; lattermost spiral cord strengthens on last whorls to match strength of second most anterior cord. Secondary beaded spiral cord usually present between two posteriormost primary spiral cords; rarely with intercalation of other beaded secondary spiral threads. Anterior suture bordered with barely visible beaded spiral cord marking edge of base; latter spiral cord bordered adaxially by rounded groove with medial thread, strong spiral cord with radially elongate beads, at least one thin spiral cord near axis, and convex axial threads. Varices and ventrolateral varix absent. Columella with single fold posterior to midpoint. Inner lip with erect flange arising from parietal area; anterior end not preserved. Outer lip flaring with terminal varix but poorly preserved.
Remarks
Specimens of Potamides henryi sp. nov., which occur together with specimens of P. janeae sp. nov., are generally more elongate and the spires more convexly conical than those of P. janeae. Specimens of P. henryi have four or more beaded primary cords, rather than the three beaded spiral cords on specimens of P. janeae, and have beaded spiral cords on the base.
Material
UWBM 107582, holotype, B8772 (type locality), L (17.8), W (6.9); remainder are paratypes: UWBM 107583, B8772, L (14.9), W (6.3); UWBM 107584, B8772, L (15.2), W (6.6); UWBM 107585, B8772, L (12.6), W (6.0); UWBM 107586, B8771, L (11.2), W (6.0); UWBM 107587, B8769, L (9.5), W 6.9; UWBM 107588, B8769, L (11.7), W (5.7); UWBM 107650, B8770, L (15.4), W (7.4); MUSM INV 250, B8772, L (14.0), W (7.9); MUSM INV 251, B8772, L (15.8), W (7.7); MUSM INV 252, B8772, L (10.0), W (5.6
).
Etymology
Named in honour of Henry R. DeVries, father of the author.
Occurrence
Lower Paleogene, Cuenca Member, Caballas Formation, East Pisco Basin, southern Peru.
description: Published as part of DeVries, Thomas J., 2019, Early Paleogene brackish-water molluscs from the Caballas Formation of the East Pisco Basin (Southern Peru), pp. 1533-1584 in Journal of Natural History 53 (25) on pages 1557-1558, DOI: 10.1080/00222933.2018.1524032, http://zenodo.org/record/3670229