Nacella DEAURATA
- Dataset
- 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
- Rank
- GENUS
Classification
- kingdom
- Animalia
- phylum
- Mollusca
- class
- Gastropoda
- order
- Patellida
- family
- Nacellidae
- genus
- Nacella
description
(FIG. 5) Patella aenea Martyn, 1784: pl. 1, fig. 17 (invalid).
description
External anatomy: The ventral area of the foot is grey and the epipodial fringe is recognizable. The mantle fold is thick and cream-coloured. The mantle tentacles are in an alternated series of three shorter pigmented ones (white / black / white) and a black longer one (Fig. 5 G). The cephalic tentacles are dorsally pigmented with a black line (Fig. 5 G). Radula: See Valdovinos & Rüth (2005) (Fig. 5 H).
discussion
Comments: Our extensive sampling effort across Pa c i f i c Pa t a g o n i a s u g g e s t s t h a t N. d e a u r a t a occurs in this region from Guarello Island (50 ° S) to Cape Horn. In the Atlantic coast this species was reported north up to Mar del Plata province (Morris & Rosenberg, 2005). However, according to de Aranzamendi et al. (2009) the distribution of the species in the Atlantic is restricted to Tierra del Fuego. This species is also abundant in the Falkland / Malvinas Islands. Molecular analyses suggest that N. deaurata represents a single genetic unit along Pacific (González-Wevar et al., 2011 a) and Atlantic (de Aranzamendi et al., 2009, 2011) Patagonia. Molecular and geometric morphometric comparisons (González-Wevar et al., 2011 a) showed that N. fuegiensis is a synonym of N. deaurata. Similarly, molecular analyses indicate that N. delicatissima represents particular morphotypes of N. deaurata (contra de Aranzamendi et al., 2009). Molecular analyses (unpublished data) indicate that N. deaurata exhibits marked levels of population genetic differentiation between Patagonia and the Falkland / Malvinas Islands.
discussion
Nacella (Patinigera) aenea – Wenz, 1938: 328, fig. 401. Patinigera aenea – Powell, 1951: 82.
discussion
Nacella (Patinigera) deaurata form delicatissima – Powell, 1973: 195; pl. 178, figs 3, 4; Ramirez, 1981: 57; Linse, 1999: 400.
discussion
Nacella (Patinigera) fugiensis [sic.] – Linse, 1999: 400. Nacella (Patinigera) magellanica – Valdovinos & Rüth, 2005: 509 (in part, not of Helbling).
distribution
Distribution: Magellanic province. Pacific Patagonia: from Guarello Island (50 ° S) to Cape Horn. Atlantic Patagonia: Tierra del Fuego. Falkland / Malvinas Islands (Fig. 5 I). Habitat: Medium and low intertidal, subtidal rocky ecosystem between 0 and 40 m depths.
materials_examined
Material studied: London Island, Pacific Patagonia (54 ° 40 ’ 00.30 ’’ S, 72 ° 03 ’ 58.67 ’’ W) N = 30; Carlos III Island, Strait of Magellan (53 ° 38 ’ 55.41 ’’ S, 72 ° 15 ’ 31.04 ’’ W) N = 20; Port Famine, Strait of Magellan (53 ° 36 ’ 34.07 ’’ S, 70 ° 55 ’ 53.40 ’’ W) N = 50; Otway Sound, Strait of Magellan (52 ° 56 ’ 13.10 ’’ S, 71 ° 11 ’ 39.07 ’’ W) N = 30; Chabunco, Strait of Magellan (52 ° 59 ’ 14.66 ’’ S, 70 ° 48 ’ 44.43 ’’ W) N = 30; Laredo Bay, Strait of Magellan (52 ° 56 ’ 59.14 ’’ S, 70 ° 48 ’ 03.96 ’’ W) N = 50; Possession Bay, Strait of Magellan (52 ° 13 ’ 55.50 ’’ S, 69 ° 17 ’ 50.71 ’’ W) N = 30; Santa María Bay, Tierra del Fuego (53 ° 19 ’ 29.86 ’’ S, 70 ° 22 ’ 34.30 ’’ W) N = 60; Caleta River, Tierra del Fuego (53 ° 51 ’ 45.32 ’’ S, 70 ° 19 ’ 54.11 ’’ W) N = 60; Pía Fjord, Beagle Channel (54 ° 49 ’ 36.81 ’’ S, 69 ° 39 ’ 11.31 ’’ W) N = 4 0; Gar ib a ldi F j or d, Beag l e C h anne l (54 ° 43 ’ 20.63 ’’ S, 69 ° 57 ’ 48.27 ’’ W) N = 30; Wulaia Bay (54 ° 59 ’ 20.30 ’’ S, 68 ° 09 ’ 02.97 ’’ W) N = 40; Tekenika Bay (55 ° 03 ’ 24.66 ’’ S, 68 ° 07 ’ 52.22 ’’ W) N = 30; Orange Bay (55 ° 27 ’ 21.44 ’’ S, 68 ° 04 ’ 02.33 ’’ W) N = 30; Virginia Bay, Beagle Channel (54 ° 54 ’ 16.95 ’’ S, 67 ° 56 ’ 05.35 ’’ W) N = 40; Puerto Williams, Beagle Channel (54 ° 56 ’ 04.95 ’’ S, 67 ° 36 ’ 48.33 ’’ W) N = 26; Lapataia Bay, Beagle Channel (54 ° 50 ’ 58.94 ’’ S, 68 ° 28 ’ 41.95 ’’ W) N = 40; Hookers Point, Falkland / Malvinas Islands (51 ° 42 ’ 09.60 ’’ S, 57 ° 46 ’ 07.49 ’’ W) N = 50. Shell: Shell shape and sculpture are very variable (de Aranzamendi et al., 2009) (Fig. 5 A – C). The species exhibits a conical morphology, dorsally raised shell, which is thick and non-translucent (Fig. 5 A – F). The anterior part of the animal is laterally compressed (Fig. 5 D – F). It has a large shell (maximum length 120 mm), which has a medium profile. The apex is located at the anterior 30 – 40 % of the shell’s length (Fig. 5 A – F). All the slopes of the shell are convex (Fig. 5 A – C). The aperture is oval to oblong. The surface of the shell is sculptured with numerous broad radial ribs and clearly defined concentric growth lines from the central zone towards the margin. The margin of the shell margin is highly crenulated. The external coloration of the shell is very variable across its distribution (pale reddish, brown, green with a bronze apex, grey, brown). The primary and secondary ribs are dark brown with clearer interspaces. The internal part of the shell has a soft metallic grey / brown interior with dark lines corresponding to external colour patterns, bordered by a white / brown halo.
synonymic_list
Nacella fuegiensis – González-Wevar et al., 2011 a: 1937.
synonymic_list
Nacella strigatella Rochebrune & Mabille, 1885: 110.
synonymic_list
Patinigera fuegiensis – Powell, 1955: 67.