Nacella, FLAMMEA

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 : 317

publication ID 10.1093/zoolinnean/zly067

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( FIG. 7 View Figure 7 )

Patella flammea Gmelin, 1791: 3716 , pl. 5, fig. 42.

Patinella flammea – Strebel, 1907: 145, pl. 5, fig. 73.

Nacella (Patinigera) flammea View in CoL – Powell, 1973: 197, pl. 181; Mutschke et al., 1988: 8; Ramírez, 1981: 57; Linse, 1999: 400; Valdovinos & Rüth, 2005: 508, fig. 5C; González-Wevar et al., 2010: 116.

Nacella flammea View in CoL – Ríos & Gerdes, 1997: 51; Ríos & Mutschke, 1999: 196; de Aranzamendi et al., 2009: 1; González-Wevar et al., 2011a: 1937; 2017: 863; Rosenfeld et al., 2015: 55 View Cited Treatment ; 2016: 77.

Material studied: Melimoyu (43º03’33.63’’ S, 73º15’12.55’’ W) GoogleMaps N = 25; Port Famine , Strait of Magellan (53º36’34.07’’ S, 70º55’53.40’’ W) GoogleMaps N = 50; Laredo Bay , Strait of Magellan (52º56’59.14’’ S, 70º48’03.96’’ W) GoogleMaps N = 30; Tekenika Bay (55º03’24.66’’ S, 68º 07’52.22’’ W) GoogleMaps N = 40; Puerto Williams , Beagle Channel (54º56’04.95’’ S, 67º36’48.33’’ W) GoogleMaps N = 40; Hookers Point , Falkland / Malvinas Islands (51º42’09.60’’ S, 57º46’07.49’’ W) GoogleMaps N = 25.

Shell: The shell shape and sculpture are relatively constant in the analysed individuals ( Fig. 7A–C View Figure 7 ). The species exhibits a conical morphology, dorsally depressed with a thin and relatively translucent shell ( Fig. 7A–F View Figure 7 ). The anterior part of the animal is laterally compressed ( Fig. 7D–F View Figure 7 ). It has a medium shell size (maximum length 80 mm) and a low profile. The apex is situated at the anterior 30–40% of the shell’s length. All the slopes of the shell are regularly straight ( Fig. 7A–F View Figure 7 ). The aperture of the shell is oval to oblong. The surface of the shell is sculptured with radial ribs, more obvious in the anterior zone, and concentric growth lines, which increase in thickness towards the shell margin. The margin of the shell is relatively even. The external coloration is quite constant in the analysed individuals with a white coloration pattern with light brown/grey/purple rays. Some rays beginning below the apical zone, others at the margin. The internal part of the shell exhibits a nacreous halo and a dun-brown spot corresponding to the animal’s body impression. Nacella flammea individuals exhibit similar internal and external coloration patterns.

External anatomy: The ventral area of the foot is white to light grey and the epipodial fringe is recognizable ( Fig. 7G View Figure 7 ). The mantle fold is thick and creamy coloured. The mantle tentacles are in alternated series of three white shorter ones and a light grey longer one ( Fig. 7G View Figure 7 ). The cephalic tentacles are not pigmented ( Fig. 7G View Figure 7 ).

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, wider spaced, with three short cusps ( Fig. 7H View Figure 7 ).

Distribution: Magellanic province. Pacific Patagonia: from Melimoyu (44°S) to Cape Horn (56°S). Atlantic Patagonia: Tierra del Fuego. Falkland/ Malvinas Islands ( Fig. 7I View Figure 7 ).

Habitat: Subtidal rocky ecosystem between 5 and 40 m.

Comments: Field observations along the Magellanic province reveal that N. flammea exhibits a patchy distribution, being highly abundant in some localities and completely absent at others. Nevertheless , preliminary population-based analyses of the species suggest that it represents a single genetic unit across its distribution (unpublished data). This revision extends the known northern limit of this species to the Melimoyu Islands (44º03’33.63’’ S, 73º15’12.55’’ W) GoogleMaps .













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

Nacella flammea

Gonzalez-Wevar CA & Hune M & Segovia NI & Nakano T & Spencer HG & Chown S & Saucede T & Johnstone G & Mansilla A & Poulin E 2017: 863
Rosenfeld S & Aldea C & Mansilla A & Marambio J & Ojeda J 2015: 55
Gonzalez-Wevar CA & Nakano T & Canete JI & Poulin E 2011: 1937
de Aranzamendi MC & Gardenal CN & Martin JP & Bastida R 2009: 1
Rios C & Mutschke E 1999: 196
Rios C & Gerdes D 1997: 51

Nacella (Patinigera) flammea

Gonzalez-Wevar CA & Nakano T & Canete JI & Poulin E 2010: 116
Valdovinos C & Ruth M 2005: 508
Linse K 1999: 400
Ramirez J 1981: 57
Powell AWB 1973: 197

Patinella flammea

Strebel H 1907: 145

Patella flammea

Gmelin JF 1791: 3716
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