Natica pipoca, Simone, 2014

Simone, Luiz Ricardo L., 2014, Taxonomic study on the molluscs collected during the Marion-Dufresne expedition (MD 55) off SE Brazil: the Naticidae (Mollusca: Caenogastropoda), Zoosystema 36 (3), pp. 563-593 : 582-586

publication ID

https://doi.org/ 10.5252/z2014n3a2

persistent identifier

https://treatment.plazi.org/id/7C5BCE66-FFD9-1959-8256-D5E09664FB9E

treatment provided by

Felipe

scientific name

Natica pipoca
status

sp. nov.

Natica pipoca View in CoL n. sp.

( Fig. 9 View FIG F-I)

HOLOTYPE. — MNHN 27156 About MNHN .

PARATYPES. — MNHN 27157, 19 shells, MZSP 105142, 6 shells from type locality.

TYPE LOCALITY. — Brazil. Espírito Santo: off Regência, MD 55 sta. DC87, 19°34’S, 39°42’W, 15 m, 29. V.1987 (coll. Bouchet, Leal & Métivier).

DIAGNOSIS. — Shell c. 2 mm, c. 85% taller than wide. Umbilicus entirely closed by callus. Sculpture lacking, surface glossy, translucent, basic color white, with irregular pale brown chevrons splayed and mostly coalescent. Protoconch dome-shaped, of 1.5 whorls. Operculum smooth, glossy, with low fold in outer edge. Spire angle c. 120°.

DESCRIPTION

Shell ( Fig. 9 View FIG F-H)

Diameter of c. 2 mm; height c. 85% of width; general form globose. Color translucent white in base; irregular pale brown chevrons splayed and mostly coalescent in most area except for peri-umbilical area ( Fig. 9G View FIG ). Protoconch domeshaped, of 1.5 flattened whorls ( Fig. 9H View FIG ); surface smooth, glossy; diameter c. 0.2 mm, occupying c. 10% of upper shell surface. Teleoconch of c. 2.5 whorls; suture planar, weakly marked; spire angle c. 120°. Sculpture absent except for growth lines. Aperture semicircular, wide, occupying c. 74% of shell height and c. 44% of shell width; outer lip thick, weakly prosocline, simple; inner lip slightly concave to almost straight ( Fig. 9F View FIG ), almost entirely covered by thick callus. Umbilicus entirely covered by thick callus, only short lower portion of umbilicus remaining uncovered ( Fig. 9F View FIG ); its aperture occupying c. 15% of lower surface.

Operculum ( Fig. 9F, I View FIG )

Semi-circular, thin, calcareous, occupying entire aperture. Nucleus in middle of inner-lower quadrant; spiral sculpture with 2 barely visible whorls; low undulations parallel to inner edge. Inner surface smooth, glossy; scar elliptical (twice wider than long), closer to inner edge, occupying c. 40% of inner surface.

Measurements (width and height in mm)

Holotype ( Fig. 9H, I View FIG ): 2.1 × 1.8.

Paratype: MZSP 105142: 2.1 × 1.8.

Habitat

15 m depth, muddy bottoms (included living specimens).

Etymology

The specific epithet is a nom in apposition, from the native Tupy word pipoca , meaning cracked skin, an allusion to the appearance of the shell spotted surface.

Natica juani Costa & Pastorino, 2012 View in CoL ( Fig. 10A, B View FIG )

Natica juani Costa & Pastorino, 2012: 30-32 View in CoL , figs 21-28, 30, 37-40.

Natica View in CoL cf. sagrayana – Simone 2011: 167, 269, 276, 283, 290, 297, 304 (non d’Orbigny, 1850).

EXAMINED MATERIAL. — Brazil. Espírito Santo: off Itaúnas , MD55 sta. DC82, 18°56’S, 37°52’W, 85-105 m, 28.V.1987 (coll. Bouchet, Leal & Métivier), MNHN, 2 shells (coll. Bouchet, Leal & Métivier) GoogleMaps ; Trindade Island , MD55 sta. DC59, 20°30’S, 29°18’W, 52-60 m depth, 22.V.1987 (coll. Bouchet, Leal & Métivier), MNHN, 1 shell (coll. Bouchet, Leal & Métivier) GoogleMaps .

REMARKS. — Natica juani has been described including the material examined by Simone (2011), which provisionally determined the samples as N. cf. sagrayana. The known distribution was from Rio de Janeiro to Uruguay ( Costa & Pastorino 2012: 31). The three specimens presently studied are dry, but well-preserved young shells; this indicates low transportation. The two samples expand the known distribution of the species northward, reaching middle Espírito Santo coast, and to east, reaching Trindade oceanic island. The deepest known environment also increases from 65 m to 105 m.

MNHN

Museum National d'Histoire Naturelle

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

MD

Museum Donaueschingen

V

Royal British Columbia Museum - Herbarium

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Naticidae

Genus

Natica

Loc

Natica pipoca

Simone, Luiz Ricardo L. 2014
2014
Loc

Natica juani

COSTA P. M. S. & PASTORINO G. 2012: 32
2012
Loc

Natica

SIMONE L. R. L. 2011: 167
2011
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