Biology:Tritia mutabilis

Short description: Species of gastropod

Tritia mutabilis
Five views of a shell of Tritia mutabilis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Family:	Nassariidae
Genus:	Tritia
Species:	T. mutabilis
Binomial name
Tritia mutabilis (Linnaeus, 1758)
Synonyms
Buccinum foliorum Gmelin 1791 Buccinum foliosum Wood W. 1818 Buccinum gibbum Bruguière 1789 Buccinum inflatum Lamarck 1822 Buccinum jaspideum Link 1807 Buccinum mutabile Linnaeus, 1758 (basionym) Buccinum rufulum Kiener 1834 Buccinum tessulatum Gmelin 1791 Nassa companyoi Fontannes 1882 Nassa ebenacea Gennari 1866 Nassa gibba Gray M.E. 1850 Nassa helvetica Peyrot 1925 Nassa mediterranea Risso 1826 Nassa mutabilis var. curta Pallary 1904 Nassa mutabilis goodalliana var. minuscula Pallary 1900 Nassa mutabilis var. minor Pallary 1900 Nassa mutabilis var. minuscularia Pallary 1904 Nassa mutabilis var. procera Pallary 1906 Nassa mutabilis var. senilis Pallary, 1910 Nassarius mutabilis (Linnaeus, 1758) Nassarius (Sphaeronassa) mutabilis (Linnaeus, 1758) Sphaeronassa adriatica Coen 1933 Sphaeronassa deformis Coen 1933 Sphaeronassa globulina Locard 1886 Sphaeronassa mutabilis (Linnaeus, 1758) Sphaeronassa umbilicata Coen 1933

Tritia mutabilis, common name : the mutable nassa, is a species of sea snail, a marine gastropod mollusk in the family Nassariidae, the nassa mud snails or dog whelks.

Description

The size of an adult shell varies between 14 mm and 30 mm.

The smooth shell is ovate, conical, and slightly ventricose. The spire is composed of seven whorls, rounded and swollen at the upper part, especially the lowest, which is larger than all the others united. The three upper whorls are finely plaited. The body whorl has a few fine, transverse striae near the base. The aperture is white and ovate, pretty strongly emarginated, and oblique at the base. The depth of the cavity is chestnut-colored. The thin outer lip is white and very finely striated internally. The inner lip is thin, white and shining and partially covers the body of the shell. The columella arcuated and terminates at the base by a sharp, and slightly projecting keel. The exterior of the shell is red or fawn-colored, ornamented with an articulated band of white and violet upon the upper edge of the whorls, with waved longitudinal yellow or red spots, the tint of which is sometimes very deep, and often very pale.

This shell, which is very common, presents somewhat remarkable varieties of color. Sometimes its ground is red ; and white, undulated, very crowded flames, or brown and distant longitudinal lines ornament it from one end to the other. At other times it is whitish, which happens when it has been a long time exposed to the light ; and in this case transverse striae are perceptible on its surface. But the articulated band about the suture always appears in each of these varieties.

Distribution

This species occurs in the Mediterranean Sea, the Black Sea, in the Atlantic Ocean off Mauritania and West Africa.

References

• Pallary, P. (1910). Sur la faune de l'ancienne lagune de Tunis. Bulletin de la Société d'Histoire Naturelle de l'Afrique du Nord. 1: 214-228
• Coen, G. (1933). Saggio di una Sylloge Molluscorum Adriaticorum. Memorie del Regio Comitato Talassografico Italiano. 192: i-vii, 1-186
• Bernard, P.A. (Ed.) (1984). Coquillages du Gabon [Shells of Gabon]. Pierre A. Bernard: Libreville, Gabon. 140, 75 plates pp.
• Cernohorsky W. O. (1984). Systematics of the family Nassariidae (Mollusca: Gastropoda). Bulletin of the Auckland Institute and Museum 14: 1-356
• Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Collection Patrimoines Naturels, 50: pp. 180–213

External links

• "Nassarius (Sphaeronassa) mutabilis" (in en). Gastropods.com. http://www.gastropods.com/2/Shell_2242.shtml. 
• Linnaeus, C. (1758). Systema Naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Editio decima, reformata (10th revised edition), vol. 1: 824 pp. Laurentius Salvius: Holmiae
• Gmelin, J. F. (1791). Vermes. In: Gmelin J.F. (Ed.) Caroli a Linnaei Systema Naturae per Regna Tria Naturae, Ed. 13. Tome 1(6). G.E. Beer, Lipsiae (Leipzig) pp. 3021-3910. Systema Naturae. Linneaeus (ed.). Ed. 13. 1: pars. 6
• Bruguière J.G. (1789-1792). Encyclopédie méthodique ou par ordre de matières. Histoire naturelle des vers, volume 1. Paris: Pancoucke. Pp. i-xviii, 1-344
• Lamarck, [J.-B. M.] de. (1822). Histoire naturelle des animaux sans vertèbres. Tome septième. Paris: published by the Author, 711 pp
• Link, D.H.F. (1807-1808). Beschreibung der Naturalien-Sammlung der Universität zu Rostock. Adlers Erben
• Kiener L.C. (1834-1841). Spécies général et iconographie des coquilles vivantes. Vol. 9. Famille des Purpurifères. Deuxième partie. Genres Colombelle, (Columbella), Lamarck, pp. 1-63, pl. 1-16
• Gray, J. E. (1850). (text). In: Gray, M. E., Figures of molluscous animals, selected from various authors. Longman, Brown, Green and Longmans, London. Vol. 4, iv + 219 pp. (August) [Frontispiece (portrait of Mrs. Gray); pp. ii–iv (preface); 1–62 (explanation of plates 1–312 in Volumes 1–3); pp. 63–124 (systematic arrangement of figures); 127–219 (reprint of Gray 1847)
• Peyrot A. (1925-1928). Conchologie néogénique de l'Aquitaine. Actes de la Société Linnéenne de Bordeaux. 77(2): 51-194
• Risso, A. (1826-1827). Histoire naturelle des principales productions de l'Europe Méridionale et particulièrement de celles des environs de Nice et des Alpes Maritimes. Paris, F.G. Levrault. 3(XVI): 1-480, 14 pls.
• Locard, A. (1886). Prodrome de malacologie française. Catalogue général des mollusques vivants de France. Mollusques marins. Lyon: H. Georg & Paris: Baillière. x + 778 pp
• Pallary, P. (1900). Coquilles marines du littoral du département d'Oran. Journal de Conchyliologie. 48(3): 211-422
• Pallary, P. (1900). Coquilles marines du littoral du département d'Oran. Journal de Conchyliologie. 48(3): 211-422
• Galindo, L. A.; Puillandre, N.; Utge, J.; Lozouet, P.; Bouchet, P. (2016). The phylogeny and systematics of the Nassariidae revisited (Gastropoda, Buccinoidea). Molecular Phylogenetics and Evolution. 99: 337-353

Wikidata ☰ Q61697815 entry