Margarella violacea (King & Broderip, 1831)

Rosenfeld, Sebastian, Aldea, Cristian, Mansilla, Andres, Marambio, Johanna & Ojeda, Jaime, 2015, Richness, systematics, and distribution of molluscs associated with the macroalga Gigartina skottsbergii in the Strait of Magellan, Chile: A biogeographic affinity study, ZooKeys 519, pp. 49-100 : 60

Margarella violacea (King & Broderip, 1831) Fig. 4J

Material examined.

69 spm (3 × 2.5 - 9 × 9 mm).

Synonymy.

See Dell (1971).

Remarks.

Rosenfeld et al. (2011) commented that the shell of the similar species Margarella expansa (Sowerby I, 1838) is composed of two well-differentiated layers, with the internal layer being thicker. Also, Margarella expansa have four pairs of epipodial tentacles and frequently present an additional unpaired tentacle ( Zelaya 2004). However, the identification between these species is quite complex due to the extreme morphological similarities (see Zelaya 2004, Rosenfeld et al. 2011). In this sense, Troncoso et al. (2001, p. 86) recorded and commented on Margarella violacea for the Kerguelen Islands, but in fact they photographed and mentioned Margarella expansa ( Troncoso et al. 2001, p. 89, Fig. 4).

Distribution.

Magellanic: Estero Elefantes ( Reid and Osorio 2000), Puerto Edén ( Dell 1971), Nelson Strait ( Linse 2002), Kirke Channel ( Linse 2002), and Smyth Channel ( Strebel 1905a); Strait of Magellan ( King and Broderip 1832, Strebel 1905a): eastern micro-basin of the Strait of Magellan ( Ríos et al. 2003), Punta Arenas ( Strebel 1905a), Agua Fresca ( Strebel 1905a), Cape Valentín ( Strebel 1905a), Porvenir ( Strebel 1905a), Inútil Bay ( USNM 2010), Gente Grande Bay ( Strebel 1905a), Punta Santa María (this record), Punta Santa Ana ( Ríos et al. 2007; this record), Dawson Island ( Strebel 1905a, USNM 2010), and Carlos III Island ( Aldea et al. 2011a); Elizabeth Island ( Strebel 1905a), Beagle Channel ( Rochebrune and Mabille 1889), Ushuaia ( Strebel 1905a, 1908), Navarino Island ( Strebel 1905a), Puerto Williams ( Dell 1971), Róbalo Bay ( Dell 1971, Ojeda et al. 2010), Basket Island ( Strebel 1905a), Puerto Toro ( Strebel 1905a), Orange Bay ( Rochebrune and Mabille 1889), Seno Grandi ( Dell 1971), Goree Passage ( Linse 2002), Picton Island ( Strebel 1905a, Linse 2002), Lenox Island ( Strebel 1905a), Bertrand Island ( Dell 1971), and Cape Horn ( Gould 1852, Linse 2002); Malvinas/Falkland Islands ( Strebel 1905a, Powell 1951), Burdwood Bank ( Melvill and Standen 1907), and Staten Island ( USNM 2010).