Distorsio perdistorta

Distorsio perdistorta, common name the bristly distorsio, is a species of medium-sized sea snail, a marine gastropod mollusk in the family Personidae, the Distortio snails.^[2]

Distorsio perdistorta
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Tonnoidea
Family:	Personidae
Genus:	Distorsio
Species:	D. perdistorta
Binomial name
Distorsio perdistorta Fulton, 1938[1]
Synonyms[2]
Distorsio (Rhysema) horrida Kuroda & Habe in Habe, 1961

Distribution

This marine species has a wide distribution and occurs in the Indo-West Pacific; the Atlantic Ocean and in the Caribbean Sea.

Description

The maximum recorded shell length is 89.5 mm.^[3]

Shell up to 80 mm, with a moderately high spire and a strongly distorted profile. The protoconch is large (2 mm), globose, distinctly cyrtoconoid with three smooth whorls. The teleoconch consists of 7-8 whorls. The body whorlis compressed on the side of the aperture and increasingly inflated opposite to it. The sculpture shows low spiral cords, and of narrow axial ribs which form indistinct nodes where crossing the spirals. The interspaces between the cords are furnished with a small intervening cordlet. Varixes are situated at about each 3/4 of a whorl over the last whorls. The aperture is subtriangular, considerably constricted by outgrowths of the outer lip and of the columellar edge. The outer lip is provided with 6-7 elongate denticles of which the third (from adapical side) is markedly larger. The parietal edge has a broad, thin and shiny callus, continued to form a broad shield also bordering the columella; provided with small blunt tubercles and molded over the varix of the preceding whorl but never bearing a distinct plait or denticle on the adapical side. The columellar edge forms a thick outgrowth which extends over the aperture, provided with denticles which increase in size towards the adapical side. The siphonal canal is short. The periostracum is hairy, rather short over most of the surface, with longer bristles over the varices. The colour of the shell is whitish to tan, the aperture tinged with brown on the edge of the outer lip and on the parietal/columellar shield.

This species is distinguished from the West African Distorsio smithi (von Maltzan, 1887) in being smaller, with a more attenuated sculpture.^[2]

Habitat

Minimum recorded depth is 72 m (236 ft).^[3] Maximum recorded depth is 282 m (925 ft).^[3]

References

1. Fulton, H. C. 1938. Descriptions and figures of new Japanese marine shells. Proceedings of the Malacological Society of London 23(1):55-56, pl. 3.. World Register of Marine Species, Retrieved 14 August 2010.
2. Distorsio perdistorta Fulton, 1938. Gofas, S. (2010). Distorsio perdistorta Fulton, 1938. 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=140726 on 14 August 2010 .
3. Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.

• Fulton, H. C. 1938. Descriptions and figures of new Japanese marine shells. Proceedings of the Malacological Society of London 23(1):55-56, pl. 3.
• Habe T. (1961). Coloured illustrations of the shells of Japan (II). Hoikusha, Osaka. xii + 183 + 42 pp., 66 pls.
• Kilburn R.N. (1975). Taxonomic notes on South African marine Mollusca (5): including descriptions of new taxa of Rissoidae, Cerithiidae, Tonnidae, Cassididae, Buccinidae, Fasciolariidae, Turbinellidae, Turridae, Architectonicidae, Epitoniidae, Limidae and Thraciidae.. Annals of the Natal Museum 22(2):577-622, figs. 1-25
• Rosenberg, G.; Moretzsohn, F.; García, E. F. (2009). Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in: Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Texas A&M Press, College Station, Texas.
• Beu A.G. 2010 [August]. Neogene tonnoidean gastropods of tropical and South America: contributions to the Dominican Republic and Panama Paleontology Projects and uplift of the Central American Isthmus. Bulletins of American Paleontology 377-378: 550 pp, 79 pls.
• Liu, J.Y. [Ruiyu] (ed.). (2008). Checklist of marine biota of China seas. China Science Press. 1267 pp.
• Steyn, D. G.; Lussi, M. (2005). Offshore Shells of Southern Africa: A pictorial guide to more than 750 Gastropods. Published by the authors. pp. i–vi, 1–289.

External links

• "Distorsio perdistorta". Gastropods.com. Retrieved 16 January 2019.
• Intergovernmental Oceanographic Commission (IOC) of UNESCO. The Ocean Biogeographic Information System (OBIS)
• Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca. in: Costello, M.J. et al. (eds), European Register of Marine Species: a check-list of the marine species in Europe and a bibliography of guides to their identification. Patrimoines Naturels. 50: 180-213.
• Beu A.G. (1998). Résultats des Campagnes MUSORSTOM: 19. Indo-West Pacific Ranellidae, Bursidae and Personidae (Mollusca: Gastropoda), a monograph of the New Caledonian fauna and revisions of related taxa. Mémoires du Muséum National d'Histoire Naturelle. 178: 1-255
• Gofas, S. & Beu, A. (2003). Tonnoidean Gastropods of the North Atlantic seamounts and the Azores. American Malacological Bulletin. 17(1-2): 91-108
• Lewis H. 1972. Notes on the genus Distorsio (Cymatiidae) with descriptions of new species. The Nautilus 86(2-4): 27-50