Nacella, EDGARI

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 : 322-325

publication ID

https://doi.org/ 10.1093/zoolinnean/zly067

publication LSID

lsid:zoobank.org:pub:68738EE0-509B-4201-854C-2ABB41662357

DOI

https://doi.org/10.5281/zenodo.5718927

persistent identifier

https://treatment.plazi.org/id/C55987A1-810A-FFC5-30CD-FA790E2CFE87

treatment provided by

Carolina

scientific name

Nacella
status

 

NACELLA EDGARI View in CoL ( POWELL, 1957)

( FIG. 11 View Figure 11 )

Patella (Patinella) fuegiensis – Smith, 1879: 180, pl. 19, figs 14, 14a (not of Reeve).

Nacella fuegiensis View in CoL – Pilsbry, 1891: 121, pl. 49, figs 28, 29, 30, 31 (not of Reeve).

Nacella (Patinigera) fuegiensis View in CoL – Thiele, 1912: 234 (not of Reeve).

Patinigera fuegiensis edgari Powell, 1957: 127 View in CoL , pl. 2, figs 5, 6; Powell, 1960: 129.

Nacella (Patinigera) edgari View in CoL – Powell, 1973: 196, pl. 179, figs 3, 4; Cantera & Arnaud, 1985: 35; Troncoso et al., 2001: 88.

Nacella (Patinigera) macquariensis View in CoL – Powell, 1973: 196 (in part, not of Finlay).

Nacella cf. macquariensis View in CoL – González-Wevar et al., 2010: 116 (not of Finlay).

Nacella edgari View in CoL – González-Wevar et al., 2016b: 2; 2017: 862.

Material studied: Port-aux-Français, Kerguelen Islands (49°21’09.84’’ S, 70°13’05.89’’ E) GoogleMaps N = 40; Port Christmas , Kerguelen Islands (48°41’40.22’’ S, 69°01’15.54’’ E) GoogleMaps N = 50; Fjord des Portes Noires , Kerguelen Islands (49°29’47.32’’ S, 69°08’06.70’’ E) GoogleMaps N = 30; Îles du Prince-de-Monaco, Kerguelen Islands (49°36’47.24’’ S, 69°14’11.38’’ E) GoogleMaps N = 50; Baie des Cascades , Kerguelen Islands (49°10’02.31’’ S, 70°08’53.33’’ E) GoogleMaps N = 30; Atlas Cove, Heard Islands (53°01’27.99’’ S, 73°23’46.95’’ E) GoogleMaps N = 5.

Shell: The shell shape and sculpture are variable in the species and two different morphologies were recorded at Kerguelen ( Fig. 11A, B View Figure 11 ) and Heard Islands ( Fig. 11C View Figure 11 ), respectively. Individuals from the Kerguelen Islands exhibit a conical morphology, dorsally depressed, with a thin and translucent shell. The anterior part of the animal is laterally compressed ( Fig. 11D–F View Figure 11 ). The shell is of medium size (maximum length 80 mm) and has a low profile. The apex is located at the anterior 20–30% of the shell. All the slopes of the shell are concave. The aperture is oval. The whole surface is crowded with concentric lamellae that undulate as they cross the radials. The margin of the shell is very crenulated. The external coloration varies in the species across its distribution (brown, grey and purple) and the apex has a bronze coloration. The interior part of the shell is iridescent bluish grey with dark lines, corresponding to external colour patterns bordered by a white/grey halo.

The morphology of N. edgari View in CoL at Heard Island was relatively constant in the analysed individuals (N = 5) with a conical form, dorsally raised, very thick and not translucent. The anterior part of the animal is laterally compressed. The shell is of medium size (maximum length 80 mm) and has a medium profile. The apex is situated at the anterior 30–40% of the shell’s length. All the slopes of the shell are convex. The aperture of the shell is oval. The surface of the shell consists of low radial folds and lamellar growth lines. The margin of the shell is very crenulated. External coloration varies from brown to reddish. The internal part of the shell has iridescent bluish grey coloration with dark lines corresponding to external colour patterns bordered by a white/grey halo.

External anatomy: The ventral area of the foot is black and the epipodial fringe is highly recognizable. The mantle fold is thick and dun-brown coloured. The mantle tentacles are in alternate series of three white shorter and a white longer one and are absent of pigmentation ( Fig. 11G View Figure 11 ). The cephalic tentacles are dorsally pigmented with a black line ( Fig. 11G View Figure 11 ).

Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, of medium length and sharp pointed, with two cusps. The second laterals are broader, wider spaced with four short cusps ( Fig. 11H View Figure 11 ).

Distribution: Kerguelen and Heard Islands ( Fig. 11I View Figure 11 ).

Habitat: This species occurs from high and medium intertidal rocky shores down to 30-m depths; the species is also regularly found on macroalgae ( Powell, 1955, 1957)

Comments: In the original description of the radula from Kerguelen Islands individuals (under the name Patella fuegiensis ) Smith (1879) describes:

Teeth of the lingual ribbon slightly hooked, in pairs, scarcely diverging; the central pairs twopronged, the inner prong much the larger, spearhead shaped; the lateral pairs alternating with the central ones are four-pronged, the innermost prong smallest, the next two subequal, and the outside one situated nearly at right angles to the rest of the tooth, about the same size or a trifle larger.

This radular teeth configuration highly resembles our observations of the radula of N. edgari . At the same time, the lateral and dorsal patterns of shell morphology recorded in Patella fuegiensis from Kerguelen by Smith (1879) are very similar to those observed in N. edgari . Accordingly, individuals identified as Nacella fuegiensis from Kerguelen should be treated as N. edgari . Powell (1957) commented that the adults of N. edgari have a very thin and fragile shell, and live closely associated to ‘kelps’. Recent multi-locus reconstructions indicate that N. edgari from the Kerguelen Islands and N. cf macquariensis from Heard Island ( González-Wevar et al., 2010) represent the same evolutionary unit (González- Wevar et al., 2017). Moreover, Nacella individuals from Macquarie Island fell within a different and endemic lineage, N. macquariensis , closely related to N. edgari (Kerguelen and Heard Islands) and to N. terroris (Campbell Island). Therefore, the colonization of both sub-Antarctic Australia / New Zealand islands, Macquarie and Campbell, constitutes a recent off-shoot from a geographically distant Kerguelenian Nacella lineage. Accordingly, N. edgari is currently restricted to Kerguelen and Heard Islands where, it coexists with N. kerguelenensis .

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

SubClass

Patellogastropoda

Order

Patellida

SuperFamily

Lottioidea

Family

Nacellidae

Loc

Nacella

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

Nacella edgari

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 & Hune M & Rosenfeld S & Saucede T & Feral J-P & Mansilla A & Poulin E 2016: 2
2016
Loc

Nacella cf. macquariensis

Gonzalez-Wevar CA & Nakano T & Canete JI & Poulin E 2010: 116
2010
Loc

Nacella (Patinigera) edgari

Troncoso N & Van Goethem JL & Troncoso JS 2001: 88
Cantera JR & Arnaud PM 1985: 35
Powell AWB 1973: 196
1973
Loc

Nacella (Patinigera) macquariensis

Powell AWB 1973: 196
1973
Loc

Patinigera fuegiensis edgari

Powell AWB 1960: 129
Powell AWB 1957: 127
1957
Loc

Nacella (Patinigera) fuegiensis

Thiele J 1912: 234
1912
Loc

Nacella fuegiensis

Pilsbry HA 1891: 121
1891
Loc

Patella (Patinella) fuegiensis

Smith EA 1879: 180
1879
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