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Remarks on the genus Trophon (s.l.) montfort, 1810 (Mollusca: Gastropoda: Muricidae) in the southern ocean and adjacent areas
Article in Thalassas: An International Journal of Marine Sciences · July 2010
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Cristian Aldea Jesus Souza Troncoso University of Magallanes University of Vigo
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REMARKS ON THE GENUS TROPHON (S.L.) MONTFORT, 1810 (MOLLUSCA: GASTROPODA: MURICIDAE) IN THE SOUTHERN OCEAN AND ADJACENT AREAS
CRISTIAN ALDEA (1,2) & JESÚS S. TRONCOSO (1)
Key words: Trophon, distribution, bathymetry, morphology, Antarctica, South-America, Sub-Antarctic islands.
ABSTRACT of this genus, no summarizing data from these areas are known and some records are confused by using of Among the several groups of molluscs in the combining genera/subgenera ( i.e. Coronium Simone, southern hemisphere, the genus Trophon Montfort, 1996, Pagodula Monterosato, 1884, Nodulotrophon 1810 has a particular importance, because it is a highly Habe & Ito, 1965 and Fuegotrophon Powell, 1951). In diversified taxon in the Southern Ocean and Sub- this work we gathered data of the distribution, shell Antarctic waters. In the middle of the XX century, 27 morphology and taxonomic remarks of 46 species species were known, which increased to 33 species at of Trophon (s.l.) starting from a performed database the beginning of the XXI century, but more than 100 with all records toward the pole from about 20ºS species were described under this genus along the time, in South-American waters, and from about 45ºS in most of them being synonyms or belonging to other the Eastern Atlantic, Indian and Western Pacific genera at the moment. Despite the great diversification Oceans. Seventeen species were found inhabiting exclusively in South-America, three in Antarctica, five in Western Sub-Antarctic waters, and five in Eastern Sub-Antarctic waters; 16 species presented
(1) Departamento de Ecología y Biología Animal, a wide range of distribution. Bathymetrically, 22 Facultad de Ciencias del Mar. species were exclusive of the continental shelf, 23 Campus Lagoas Marcosende, 36310. reached the slope and one the deep-sea (>3,000 m). Universidad de Vigo, ESPAÑA. E-mail: [email protected] (C. Aldea), [email protected] From the shell morphology, five main morphotypes were recognized. Affinities between species and with (2) Fundación Centro de Estudios del Cuaternario de Fuego- Patagonia y Antártica (CEQUA), combining genera were discussed from the obtained Avenida Bulnes 01890, Punta Arenas, CHILE. data.
47 CRISTIAN ALDEA & JESÚS S. TRONCOSO
Figure 1: Distribution of species of Trophon (s.l.) in South-America: T. acanthodes (ac), T. amettei (am), T. bahamondei (ba), T. columbarioides (cb), T. ceciliae (ce), T. clenchi (cl), T. condei (co), T. declinans (de), T. fasciolarioides (fa), T. geversianus (ge), T. iarae (ia), “T.” malvinarum (ma), T. minutus (mi), T. ohlini (oh), T. pallidus (pa), T. pelseneeri (pe), T. plicatus (pl), T. parodizi (pr), T. patagonicus (pt), T. triacanthus (tr), T. vangoethemi (va) and T. veronicae (ve).
48 REMARKS ON THE GENUS TROPHON (S.L.) MONTFORT, 1810 (MOLLUSCA: GASTROPODA: MURICIDAE) IN THE SOUTHERN OCEAN AND ADJACENT AREAS
Figure 2: Distribution of species of Trophon (s.l.) around Antarctica: T. coulmanensis coulmanensis (cc), T. coulmanensis multilamellatus (cm), T. cuspidarioides (cu), T. drygalskii (dr), T. echinolamellatus (ec), T. enderbyensis (en), T. leptocharteres (le), T. longstaffi (lo), T. minutus (mi), T. nucelliformis (nu), T. poirieria (po), T. shackletoni paucilamellatus (sp), T. shackletoni shackletoni (ss) and T. scotianus (st).
INTRODUCTION the morphologic pattern with all fusiform and/or lamellate –usually with spiral ornamentation– The genus Trophon Montfort, 1810 represents muricids (Pastorino and Scarabino, 2008) are particular importance among the several genera highlighted points of shell morphology in the of molluscs in the southern hemisphere since it identity of this genus. has a high diversification, mainly in the Southern Ocean and adjacent waters. The austral origin, From the proposal of the genus for Buccinum being the older species traced as far back as the geversianus Pallas, 1774, numerous records with Oligocene (Griffin and Pastorino, 2005), and taxonomic remarks and new species from research