Tonna galea (Linnaeus, 1758)
Tropical W. Atlantic to Mediterranean & W. Africa.
Predator on holothurians and occasionally on fishes, shells, sea-urchins and stars, in infralittoral and circalittoral soft bottoms. Original taxon: Buccinum galea.
5m deep, on sand, western bay, Palaiohora, SW. Crete. 135mm.
A Helmet-Tun with its periostracum.
9m deep, on rough sand, north Kolokitha cove, Spinalonga peninsula, Elounda, Lassithi, N. Crete. 70mm.
The Dolium galea pictured in W. Kobelt: Iconographie der schalentragenden europäischen Meeresconchylien vol II, Cassel 1901, plate L.
The species, printed on a stamp of Malta Post.
Tonna-shaped rhyton (bottom-drilled ceremony vase) carved in Nysiros obsidian, from Agia Triada, central Crete, 1500-1450 BC. Heraklion Archaeological Museum.
30m deep, on sand, Bozcaada Island, Çanakkale, Western Marmara, W. Turkey. 175mm.
The animal in G. S. Poli: Testacea utriusque Siciliae…, vol. IV, Parma 1791-1796, plate XLVII via BHL.
Above and below: a specimen from Greece, 210mm.
Original pictures provided by M. Gáspár (RO) – CC BY-NC-SA.
The species has « a period of pelagic development of over three months. […] A comparison between the duration of larval development and the velocity of the North and tropical Atlantic surface currents shows that transoceanic dispersal […] is possible even without a delay in settlement. » – R. S. Scheltema: “Larval dispersal as a means of genetic exchange between geographically separated populations of shallow-water benthic marine gastropods”, The Biological bulletin vol. 140, Woods Hole 1971, p.319.

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