Nacella, TERRORIS

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 : 325-327

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.5718931

persistent identifier

https://treatment.plazi.org/id/C55987A1-810F-FFCB-30F6-F91308B8F98F

treatment provided by

Carolina

scientific name

Nacella
status

 

NACELLA TERRORIS View in CoL ( FILHOL, 1880)

( FIG. 12 View Figure 12 )

Patella terroris Filhol, 1880: 1095 ; Filhol, 1885: 529. Nacella (Patinigera) illuminata Suter, 1913: 77 View in CoL .

Patinigera terroris View in CoL – Powell, 1955: 69.

Nacella (Patinigera) terroris View in CoL – Powell, 1973: 200, pl. 182, figs 3, 4; Powell, 1979: 42, pl. 15, 16.

Nacella terroris View in CoL – González-Wevar et al., 2017: 862.

Material studied: Perseverance Harbour , Campbell Island (52°33’02.14’’ S, 169°09’08.38’’ E) N = 3 GoogleMaps .

Shell: The shell shape and sculpture are constant in the three analysed specimens ( Fig. 12A–C View Figure 12 ). The species exhibits a conical morphology, dorsally raised, with a very thick and non-translucent shell ( Fig. 12A–F View Figure 12 ). The anterior part of the animal is laterally compressed ( Fig. 12D–F View Figure 12 ). The shell is of medium size (maximum length 80 mm) and exhibits a high profile. The apex is situated at the anterior 40% of the shell. All the slopes are convex ( Fig. 12A– C View Figure 12 ). The aperture is oval. The surface of the shell is sculptured with raised angular primary radial ribs, weaker secondary ones and concentric growth lines that are visible in the interspaces. The margin of the shell is crenulated. The external coloration is pale reddish-brown and grey. The primary and secondary ribs are red-brown to ash-coloured to dark brown with clearer interspaces. The internal part of the shell has a soft metallic-brown coloration with dark lines corresponding to external colour patterns, bordered by a white/brown halo.

External anatomy: The ventral area of the foot is grey and the epipodial fringe is quite recognizable. The mantle fold is thin and dun-brown coloured. The mantle tentacles are not pigmented and in alternate series of three white and a white longer one ( Fig. 12G View Figure 12 ). The cephalic tentacles are dorsally pigmented with a black line ( Fig. 12G View Figure 12 ).

Radula: The first lateral teeth are set close together on the anterior edge of the basal plates, long and sharp pointed, with two long cusps. The second laterals are broader, wider spaced with three short cusps ( Fig. 12H View Figure 12 ).

Distribution: Campbell Island, sub-Antarctic New Zealand ( Fig. 12I View Figure 12 ).

Habitat: Low intertidal and subtidal rocky ecosystem down to 30 m.

Comments: Multi-locus phylogenetic reconstructions recognized N. terroris from Campbell Island as a distinct taxonomic unit, closely related to Macquarie Island’s N. macquariensis and to N. edgari from Kerguelen and Heard Islands. Phylogenetic relationships and divergence time estimates indicate that Nacella species from New Zealand ( N. terroris ) and Australia ( N. macquariensis ) constitute a recent offshoot from the Kerguelen Archipelago (González- Wevar et al., 2017).

MOLECULAR ANALYSES

As previously demonstrated ( Nakano & Ozawa, 2004, 2007; González-Wevar et al., 2010, 2017), the monophyly of Nacellidae ( Nacella + Cellana ), as well as the molecular distinction and the sister relationship between Nacella and Cellana , were highly supported ( Fig. 13 View Figure 13 ). Within Nacella , no topological inconsistencies were detected when comparing mitochondrial and nuclear markers. Phylogenetic reconstructions recognized the division of Nacella into two main clades. The first (I) includes South American lineages, while the second ( II), those from maritime Antarctica and sub- Antarctic islands ( Fig. 13 View Figure 13 ).

In South America, main clade I includes individuals of the new Magellanic lineage (a) N. yaghana sp. nov. ( Fig. 13 View Figure 13 ). All the analysed specimens from Pía and Garibaldi Fjords, Beagle Channel, fell within a clearly resolved, reciprocal monophyletic clade and, therefore, represent a new previously unrecognized Nacella species here described ( Fig. 13 View Figure 13 ). Lineage (b) includes all the individuals of N. clypeater collected along Central Chile in the Pacific margin of South America between 42°S and 30°S ( Fig. 13 View Figure 13 ). Finally, lineage (c) represents the most diverse South American group and includes Magellanic species: N. deaurata , N. flammea , N. magellanica and N. mytilina . As observed in previous studies ( González-Wevar et al., 2010), mitochondrial DNA reconstructions recognized the reciprocal monophyly of N. mytilina and N. flammea , but failed to recover that between N. deaurata and N. magellanica . However, 28S rRNA and the concatenated analyses ( Fig. 13 View Figure 13 ) recovered the reciprocal monophyly of all four Magellanic species with strong support. Accordingly, the current diversity of Nacella in South America includes three lineages (a–c) and six species ( N. clypeater , N. deaurata , N. flammea , N. magellanica , N. mytilina and N. yaghana sp. nov.).

The second main clade II includes Nacella species from sub-Antarctic islands and from maritime Antarctica ( Fig. 13 View Figure 13 ). Lineage (d) includes the species N. edgari (Kerguelen and Heard Islands), N. macquariensis ( Macquarie Island) and N. terroris (Campbell Island). All the methods and molecular markers recognized N. edgari as a monophyletic unit, including individuals previously labelled N. cf. macquariensis from Heard Island ( González-Wevar et al., 2010) ( Fig. 13 View Figure 13 ). At the same time, the species N. macquariensis ( Macquarie Island) and N. terroris (Campbell Island) are both monophyletic and form a clade closely related to N. edgari ( Fig. 13 View Figure 13 ). Lineage (e) includes individuals of N. kerguelenensis (Kerguelen and Heard Islands), but this species was not found at Macquarie Island as reported by Powell (1973). Interestingly, high levels of genetic divergence characterize the sympatric species N. kerguelenensis and N. edgari . In fact, molecular divergence between these sympatric species are similar to those recorded between Antarctic and sub-Antarctic lineages of the genus ( González-Wevar et al., 2012b, 2016b). Finally, lineage (f) includes the Antarctic limpet N. concinna and its sister species N. delesserti from the sub-Antarctic Marion and Crozet Islands ( Fig. 13 View Figure 13 ). Accordingly, the diversification of Nacella in the Kerguelen Plateau and New Zealand Islands includes two main lineages (d and e) and four species ( N. edgari , N. kerguelenensis , N. macquariensis and N. terroris ) while maritime Antarctica encompasses a single lineage (f) with two sister species ( N. concinna and N. delesserti ).

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Patellida

Family

Nacellidae

Loc

Nacella

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

Nacella terroris

Gonzalez-Wevar CA & Hune M & Segovia NI & Nakano T & Spencer HG & Chown S & Saucede T & Johnstone G & Mansilla A & Poulin E 2017: 862
2017
Loc

Nacella (Patinigera) terroris

Powell AWB 1979: 42
Powell AWB 1973: 200
1973
Loc

Patinigera terroris

Powell AWB 1955: 69
1955
Loc

Patella terroris

Suter H 1913: 77
Filhol H 1885: 529
Filhol H 1880: 1095
1880
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