Tonna (gastropod)

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Tonna
Tonna galea 02.jpg
Five views of a shell of Tonna galea
Scientific classification
Kingdom:
Phylum:
Class:
(unranked):
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Genus:
Tonna

Brunnich, 1772
Type species
Buccinum galea
Species

See text

Synonyms [1]
  • CadiumLink, 1807
  • CadusRöding, 1798
  • DoliumLamarck, 1801
  • Dolium (Dolium)Lamarck, 1801 (Recombination as subgenus)
  • ForatidoliumRovereto, 1899 (Replacement name for Perdix Montfort, 1810 (non Brisson, 1760))
  • MacgillivrayiaForbes, 1852
  • ParvitonnaIredale, 1931
  • PerdixMontfort, 1810 (Invalid: junior homonym of PerdixBrisson, 1760 [Aves]; Foratidolium is a replacement name)
  • Tonna (Tonna) Brünnich, 1771 (Recombination as subgenus)

Tonna is a genus of large sea snails, marine gastropod molluscs in the family Tonnidae, the tun or cask shells. [1]

Contents

Description

The thin shell is ventricose, inflated, generally globular, rarely oblong and encircled with ribs. The spire is short. The outer lip is crenulated and sometimes denticulated throughout its whole length. The oblong aperture is very large and emarginated inferiorly. The columella is channeled. There is no operculum.

The animal is very large, so as scarcely to be contained within its shell. The head is broad, swollen before, supporting two long, slender, obtuse, distant tentacles, dilated towards the base, where the eyes are situated. The mouth is large, muscular, strong and retractile. The respiratory tube is pretty stout. Its cavity is capacious, entirely open, provided with two branchiae placed on the left side, the larger of which, describes a pretty large semicircle. The trunk is cylindrical, very much developed, flexible, capable of being turned in every direction at the will of the animal, and of elongating itself in a remarkable manner. It is furnished internally with several rows of hooks. The foot is ovate, large, fleshy, bordering all parts of the shell. It is rounded, widened, lobed and dilated before, with a horizontal furrow. The posterior extremity has no trace of an. operculum. The generative organ of the male is very retractile. [2]

Anterior view of a live Tonna galea held in a human hand Tonna Galea, held in hand, showing shell and foot, Astir Beach, Vouliagmeni, Attika, Greece.jpg
Anterior view of a live Tonna galea held in a human hand

The genus Tonna comprehends a small number of species, some of which attain so remarkable a growth, that they are sometimes as large as a man's head. In fact the general appearance of the shell, of an inflated, thick-set form, calls up the image of a tun, whence is derived its generic name. Thus, the characters which make up these species are a form more or less inflated, girdled, and very globular. The spire is much shorter than the body whorl. This causes the size of the aperture, which almost always occupies two thirds of the length of the shell. [2]

The animals of the tuns are in general strongly colored, and painted with different tints which form bands and spottings upon their entire exterior. [2]

Distribution

This marine species is cosmopolitan.

Species

Species within the genus Tonna include:

Species brought into synonymy

Related Research Articles

<i>Bulla</i> (gastropod) Genus of gastropods

Bulla is a genus of medium to large hermaphrodite sea snails, shelled marine opisthobranch gastropod molluscs. These herbivorous snails are in the suborder Cephalaspidea, headshield slugs, and the order Opisthobranchia.

<i>Nucella</i> Genus of gastropods

Nucella, common name dog whelks or dog winkles, is a genus of small to medium-sized predatory sea snails, marine gastropod mollusks in the subfamily Ocenebrinae which is part of the large family Muricidae, the murex snails or rock snails.

<i>Turritella</i> Genus of gastropods

Turritella is a genus of medium-sized sea snails with an operculum, marine gastropod mollusks in the family Turritellidae.

<i>Scutus</i> Genus of gastropods

Scutus is a genus of large sea snails or limpets with the common name "shield shells". These are marine gastropod molluscs in the family Fissurellidae, the keyhole limpets and slit limpets.

<i>Buccinum</i> Genus of gastropods

Buccinum is a genus of medium-sized sea snails, marine gastropod molluscs in the family Buccinidae, the true whelks.

<i>Trochus</i> Genus of gastropods

Trochus is a genus of medium-sized to large, top-shaped sea snails with an operculum and a pearly inside to their shells, marine gastropod molluscs in the family Trochidae, the top snails.

<i>Thais</i> (gastropod) Genus of gastropods

Thais, sometimes known by the common names dog winkles or rock shells, is a genus of medium to large predatory sea snails with an operculum, marine gastropod mollusks in the family Muricidae.

<i>Tonna cumingii</i> Species of gastropod

Tonna cumingi, common name Cuming's tun, is a species of very large sea snail, a tun snail, a marine gastropod mollusc in the family Tonnidae, the tuns.

<i>Tonna dolium</i> Species of gastropod

Tonna dolium, common name the spotted tun, is a species of large sea snail or tun snail, a marine gastropod mollusc in the family Tonnidae, the tun shells.

<i>Tonna galea</i> Species of gastropod

Tonna galea, commonly known as the giant tun, is a species of marine gastropod mollusc in the family Tonnidae. This very large sea snail or tun snail is found in the North Atlantic Ocean as far as the coast of West Africa, in the Mediterranean Sea and the Caribbean Sea. The species was first described by Carl Linnaeus in 1758.

<i>Tonna perdix</i> Species of gastropod

Tonna perdix, common name the partridge tun, is a species of very large sea snail, a marine gastropod mollusc in the family Tonnidae, the tun shells.

<i>Bursa</i> (gastropod) Genus of gastropods

Bursa is a genus of large sea snails, marine gastropod molluscs in the family Bursidae, the frog snails or frog shells.

<i>Janthina</i> Genus of gastropods

Janthina is a genus of small to medium-sized pelagic or planktonic sea snails, marine gastropod molluscs in the family Epitoniidae.

<i>Lithopoma</i> Genus of gastropods

Lithopoma is a genus of medium-sized to large sea snails with a calcareous operculum, marine gastropod mollusks in the family Turbinidae, the turban snails.

<i>Tonna allium</i> Species of gastropod

Tonna allium, common name the costate tun, is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

Tonna dunkeri is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

<i>Tonna sulcosa</i> Species of gastropod

Tonna sulcosa, common name banded tun, is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

<i>Tonna chinensis</i> Species of gastropod

Tonna chinensis, common name : the China tun, is a species of large sea snail, a marine gastropod mollusk in the family Tonnidae, the tun shells.

<i>Tonna variegata</i> Species of gastropod

Tonna variegata, commonly known as the variegated tun, is a species of marine gastropod mollusc in the family Tonnidae.

References

  1. 1 2 WoRMS (2010). Tonna Brunnich, 1771. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138557 on 2011-02-23
  2. 1 2 3 Kiener (1840). General species and iconography of recent shells : comprising the Massena Museum, the collection of Lamarck, the collection of the Museum of Natural History, and the recent discoveries of travellers; Boston :W.D. Ticknor,1837 (described as 'Dolium)

Further reading