Nacella clypeater, (LESSON, 1831)

González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish & Poulin, Elie, 2019, Systematic revision of Nacella (Patellogastropoda: Nacellidae) based on a complete phylogeny of the genus, with the description of a new species from the southern tip of South America, Zoological Journal of the Linnean Society 186, pp. 303-336 : 309

publication ID 10.1093/zoolinnean/zly067

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Nacella clypeater



( FIG. 3 View Figure 3 )

Patella clypeater Lesson, 1831: 419   ; Reeve, 1854: pl. 16, figs A, B; Huppé, 1854: 259.

Nacella (Patinella) clypeater   – Pilsbry, 1891: 122.

Patinigera clypeata   – Dell, 1964: 273.

Nacella (Patinigera) clypeater   – Powell, 1973: 193, pl. 175, figs 1, 2; Ramírez, 1981: 52; Valdovinos & Ruth, 2005: 504.

Nacella clypeater   – Aldea & Valdovinos, 2005: 369; González-Wevar et al., 2010: 116; 2017: 863.

Material studied: Coquimbo (29°58’04.68’’ S, 71°22’00.79’’W) GoogleMaps   N = 40; Valparaíso (33°00’56.98’’S, 71°33’39.62’’W) GoogleMaps   N = 25; Pichilemu (34°25’29.96’’S, 72°02’39.31’’W) GoogleMaps   N = 20; Tubul (37°13’11.09’’S, 73°26’35.55’’W) GoogleMaps   N = 35; Mehuín (39°26’39.04’’S, 73°13’52.63’’W) GoogleMaps   N = 25; La Misión (39°47’44.48’’S, 73°23’59.17’’W) GoogleMaps   N = 40; Pucatrihue (40°32’39.92’’S, 73°43’16.68’’W) GoogleMaps   N = 25.

Shell: The shell shape and sculpture are relatively constant in the analysed individuals from different localities along the Chilean Central coast ( Fig. 3A–F View Figure 3 ). The species exhibits a conical morphology, dorsally depressed with a relatively thick and non-translucent shell ( Fig. 3A–C View Figure 3 ). The anterior part of the animal is laterally compressed ( Fig. 3D–F View Figure 3 ). The shell is large (maximum length 120 mm) with a low profile. The apex is situated at the anterior 30% of the shell. The anterior slope of the shell is slightly concave, while the lateral and the posterior slopes are convex ( Fig. 3A–C View Figure 3 ). The aperture of the shell is circular. The surface of the shell is sculptured with fine, rounded near-radial ribs and concentric growth lines beginning below the apex. The margin of the shell is relatively even. The external coloration varies (grey, green and brown) with clear white, yellow and creamy ribs. The internal part of the shell exhibits silvery to pale bronze, with a brown spot that corresponds to the impression of the body.

External anatomy: The ventral area of the foot and the mantle fold are creamy white coloured and the epipodial fringe is recognizable. The mantle fold is thin and bordered by a black narrow line. Mantle tentacles are in alternate series of three short ones and a slightly longer one and lack pigmentation ( Fig. 3G View Figure 3 ). The cephalic tentacles are not pigmented ( Fig. 3G View Figure 3 ).

Radula: See Valdovinos & Rüth (2005) ( Fig. 3H View Figure 3 ).

Distribution: Pacific margin of the Chilean coast between 42°S and 30°S ( Fig. 3I View Figure 3 ).

Habitat: Low intertidal and subtidal rocky shores between 0 to 20 m depths.

Comments: Field observation along the Chilean coast shows that N. clypeater   exhibits a patchy distribution being highly abundant in some localities and completely absent at others. In fact, Aguilera (2011), in a rocky intertidal trophic study across the Chilean coast, did not record the presence of N. clypeater   and, therefore, considered it as an uncommon inter- subtidal species. Population-based analyses in the species suggest that N. clypeater   represents a single genetic unit across its distribution and exhibits extremely low levels of mtDNA (COI) genetic diversity across its distribution (unpublished data).














Nacella clypeater

González-Wevar, Claudio A., Hüne, Mathias, Rosenfeld, Sebastián, Nakano, Tomoyuki, Saucède, Thomas, Spencer, Hamish & Poulin, Elie 2019

Nacella clypeater

Gonzalez-Wevar CA & Hune M & Segovia NI & Nakano T & Spencer HG & Chown S & Saucede T & Johnstone G & Mansilla A & Poulin E 2017: 863
Gonzalez-Wevar CA & Nakano T & Canete JI & Poulin E 2010: 116
Aldea C & Valdovinos C 2005: 369

Nacella (Patinigera) clypeater

Valdovinos C & Ruth M 2005: 504
Ramirez J 1981: 52
Powell AWB 1973: 193

Patinigera clypeata

Dell, RK 1964: 273

Nacella (Patinella) clypeater

Pilsbry HA 1891: 122

Patella clypeater

Huppe LH 1854: 259