Polystira tupan, Simone & Tarasconi, 2022

Simone, Luiz Ricardo L. & Tarasconi, José Carlos, 2022, Two new species of deep water south Brazilian turriforms (Neogastropoda, Conoidea, Turridae and Cochlespiridae), Papéis Avulsos de Zoologia 62, pp. 1-7 : 2

Polystira tupan sp. nov.

( Figs. 1 A-E) http://zoobank.org/ F2E42EF6-DB9F-447C-AF1F-3D0789B29EDC

Types: Holotype MZSP 156575 .

Type locality: BRAZIL. Santa Catarina ; off Itajaí, 26°53 ′ S, 46°32 ′ W, 350 m (otter trawl, iv.2005).

Etymology: The specific epithet is in apposition, and refers to the native Tupi-Guarani godhead Tupã, the Thunder-God, creator of the earth, heaven and seas.This is an allusion to the large size of the shell.

Diagnosis: Shell over 80 mm; spire angle ~30°. Sculpture 4 narrow subsutural spiral lines in superior ⅓, and 4 strong spiral cords in penultimate whorl in inferior ⅔, being superior cord larger, equally spaced; interspaces of spiral cords and lines filled by uniform distributed axial lines, with additional spiral line interposed in spiral cords in inferior ⅔. Canal relatively short, anal notch very shallow.

Description: Shell ( Fig. 1 ) over 80 mm; 3.5 times longer than wide; spire angle ~30°.Walls thick. Growth uniformly increasing. Spire ~49% of total length; suture shallow, well-marked. Protoconch unknown (eroded). Sculpture as delicate, relatively uniform reticulate, with predominance of spiral sculpture; successive scars of anal notch located between middle and superior thirds, forming larger spiral cord (spiral cord B); superior third weakly convex, possessing 4 spiral cords (spiral cords A) relatively uniform and equidistant from each other, interspaces fulfilled by axial secondary narrow cords, uniformly and slightly prosocline distributed. Penultimate whorl with middle and inferior thirds with 4 similar-size strong spiral cords ( Figs.1B, E ), interspaces ~1.5 times wider than each cord, fulfilled by ~60 uniform axial narrow cords (spiral cords C to F). Body whorl slightly larger than expected by uniform spire growth; sculpture similar to penultimate whorl, ~11 subcarinate spiral cords uniformly fulfilled by axial narrow cords ( Figs. 1C, D ). Aperture elliptical, ~1.5 times longer than wide; superior region with terminal narrow notch; inferior region simply opened to canal, lacking folds. Outer lip ( Fig. 1D ) with shallow anal notch located preceding superior quarter; smoothly bearing small expansion as end of each spiral cords. Inner lip weakly concave, callus narrow, relatively thin. About 10 spiral internal cords detectable, ending ~ ⅛ whorl posterior to outer lip ( Fig. 1A ); each cord narrow, low, smooth interspaces ~3-times wider than cords. Canal simple, straight, with ~60% of spire length, prolonging shell length ~20% forwards.

Figures

Figure 1. Polystira tupan Holotype MZSP 156575 (L 76.1 mm): (A) apertural view; (B) right view; (C) dorsal view; (D) digital reconstitution of peristome based on growth lines,right view;(E) detail of sculptureof antepenultimate and penultimate whorls,scale = 5 mm.