Nacella kerguelenensis, (SMITH, 1879)

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 : 321-322

publication ID 10.1093/zoolinnean/zly067

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Nacella kerguelenensis



( FIG. 10 View Figure 10 )

Patella (Patinella) kerguelenensis Smith, 1879: 177 , pl. 19, figs 13, 13a.

Patella (Nacella) mytilina – 181, not of Helbling.

Patella kerguelenensis – Watson, 1886: 27.

Nacella kerguelenensis View in CoL – Pilsbry, 1891: 121, pl. 49, figs 7, 8; Hedley, 1916: 44; Dell, 1964: 276; Powell, 1973: 192, pl. 173, figs 3, 4; Cantera & Arnaud, 1985: 33; González-Wevar et al., 2010: 116; 2017: 862.

Patinella kerguelenensis – Strebel, 1908: 83.

Nacella mytilina View in CoL – Thiele, 1912: 234, Powell, 1951: 80; 1973: 192 (in part, not of Helbling).

Patinigera cf. kerguelenensis – Powell, 1955: 69.

Patinigera kerguelenensis – Powell, 1957: 126.

Nacella (Patinigera) mytilina View in CoL – Cantera & Arnaud, 1985: 33 (not of Helbling)

Nacella cf. mytilina View in CoL – Troncoso et al., 2001: 88 (not of Helbling).

Material studied: Port-aux-Français, Kerguelen Islands (49°21’09.84’’ S, 70°13’05.89’’ E) GoogleMaps N = 50; Port Christmas , Kerguelen Islands (48°41’40.22’’ S, 69°01’15.54’’ E) GoogleMaps N = 60; Fjord des Portes Noires , Kerguelen Islands (49°29’47.32’’ S, 69°08’06.70’’ E) GoogleMaps N = 50; Îles du Prince-de-Monaco, Kerguelen Islands (49°36’47.24’’ S, 69°14’11.38’’ E) GoogleMaps N = 30; Baie des Cascades , Kerguelen Islands (49°10’02.31’’ S, 70°08’53.33’’ E) GoogleMaps N = 30; Atlas Cove, Heard Island (53°01’27.99’’ S, 73°23’46.95’’ E) GoogleMaps N = 10.

Shell: The shell shape and sculpture are very variable in the species and two different morphotypes have been recorded at Kerguelen Islands: (1) a kelp-dweller ( Fig. 10A View Figure 10 ) and (2) a hard-substrate morphotype ( Fig. 10B, C View Figure 10 ). The shell and the sculpture of the hard-substrate morphotype are relatively constant in the analysed individuals, which exhibit a conical morphology, dorsally raised, with a very thick and non-translucent shell. The anterior part of the animal is laterally compressed ( Fig. 10A–D View Figure 10 ). The shell is large (maximum length 120 mm) and has a medium profile. The apex is located at the the anterior 30% of the shell. All the slopes of the shell are convex. The aperture of the shell is oval. The surface of the shell is sculptured with weak radial folds. The margin of the shell is very crenulated. The external coloration varies from purplish brown to grey/white and the apex is reddish bronze. The internal part of the shell varies from light brown to purple with a metallic lustre and dark lines corresponding to external colour patterns bordered by a white/grey halo.

The shell of the kelp-dweller morphotype resembles N. mytilina from the Magellanic province. This morphotype is conical, dorsally raised, with a very thin and translucent shell. The shell is of medium size (maximum length 60 mm), with a low profile. The apex is situated at the anterior 20% of the shell, anteriorly directed and curved toward the border, and obtuse. The anterior slope is concave, while the posterior and lateral ones are convex. The aperture is oval. The surface of the shell is sculptured with a few radial ribs, more obvious in the anterior zone, with concentric growth lines. The margin of the shell is relatively even. The external and internal coloration of the shell is purple to brown, with darker tones toward the apex.

External anatomy (for both morphotypes): The ventral area of the foot is dark grey to black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternated series of three shorter pigmented ones (white/black/white) and a black longer one ( Fig. 10G View Figure 10 ). The cephalic tentacles are dorsally pigmented with a black line ( Fig. 10G View Figure 10 ).

Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and sharp pointed, with two cusps. The second laterals are broader with four sharp cusps ( Fig. 10H View Figure 10 ).

Distribution: Kerguelen and Heard Islands ( Fig. 10I View Figure 10 ). Nacella kerguelenensis is highly abundant and exhibits a continuous distribution in the Kerguelen Archipelago. The species is also broadly distributed on Heard Island.

Habitat: The species occurs in the high and medium intertidal rocky ecosystem down to 40 m depths; it is also abundant grazing on macroalgae.

Comments: As previously mentioned, the kelpassociated morphotype of N. kerguelenensis exhibits major parallels in terms of shell morphology, thickness and sculpture, as well as habitat preferences with the Patagonian N. mytilina . Recent molecular analyses determined that this kelp-associated morphotype at Kerguelen Islands fell within the genetic diversity recorded in N. kerguelenensis ( González-Wevar et al., 2017) . Accordingly, N. kerguelenesis is restricted to Kerguelen and Heard Islands ( González-Wevar et al., 2010, 2017, this revision).














Nacella kerguelenensis

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

Nacella cf. mytilina

Troncoso N & Van Goethem JL & Troncoso JS 2001: 88

Nacella (Patinigera) mytilina

Cantera JR & Arnaud PM 1985: 33

Patinigera kerguelenensis

Powell AWB 1957: 126

Patinigera cf. kerguelenensis

Powell AWB 1955: 69

Nacella mytilina

Powell AWB 1973: 192
Powell AWB 1951: 80
Thiele J 1912: 234

Patinella kerguelenensis

Strebel H 1908: 83

Nacella kerguelenensis

Gonzalez-Wevar CA & Hune M & Segovia NI & Nakano T & Spencer HG & Chown S & Saucede T & Johnstone G & Mansilla A & Poulin E 2017: 862
Gonzalez-Wevar CA & Nakano T & Canete JI & Poulin E 2010: 116
Cantera JR & Arnaud PM 1985: 33
Powell AWB 1973: 192
Dell, RK 1964: 276
Hedley C 1916: 44
Pilsbry HA 1891: 121

Patella kerguelenensis

Watson RB 1886: 27

Patella (Patinella) kerguelenensis

Smith EA 1879: 177
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