Seguenzia

Seguenzia is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae.^[2]

Seguenzia
Drawing with apertural view of a shell of Seguenzia elegans
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Superfamily:	Seguenzioidea
Family:	Seguenziidae
Subfamily:	Seguenziinae
Genus:	Seguenzia Jeffreys, 1876 [1]
Type species
Seguenzia formosa Jeffreys, 1876

This genus was named after Giuseppe Seguenza (1833–1889), the palaeontologist at Messina, Italy.

Description

The thin shell has a turbinate or subtrochoid shape. It is translucent, the outer layer very slight, somewhat nacreous in fresh specimens. There is no epidermis. The shell contains spiral carinations. The upper part of the body whorl is deeply and widely grooved. The aperture is irregular and sinuous behind. The columella is twisted and abruptly notched below. It has a small tooth-like process. The base of the shell shows a sinus. It is deeply umbilicated or imperforate. The thin operculum is oval, with a subcentral nucleus and with obsolete, numerous concentric lines.^[3][4]

Species

According to the World Register of Marine Species (WoRMS), the following species with valid name are included within the genus Seguenzia :^[5]

• Seguenzia antarctica Thiele, 1925^[6]
• Seguenzia balicasagensis Poppe, Tagaro & Dekker, 2006^[7]
• Seguenzia beloni Poppe, Tagaro & Dekker, 2006^[8]
• Seguenzia cervola Dall, 1919
• Seguenzia chariessa Marshall, 1991
• Seguenzia chelina Marshall, 1983
• Seguenzia compta Marshall, 1983
• Seguenzia conopia Marshall, 1983
• Seguenzia costulifera Schepman, 1909
• Seguenzia dabfari Poppe, Tagaro & Dekker, 2006^[9]
• Seguenzia dautzenbergi Schepman, 1909
• † Seguenzia donaldi Ladd, 1982
• Seguenzia eidalima Marshall, 1991
• Seguenzia elegans Jeffreys, 1885^[10]
• Seguenzia elegantissima Poppe, Tagaro & Dekker, 2006^[11]
• Seguenzia emmeles Marshall, 1991
• Seguenzia engonia B.A. Marshall, 1991
• Seguenzia eritima Verrill, 1884^[12]
• Seguenzia eutyches Marshall, 1991
• Seguenzia fatigans Barnard, 1963
• Seguenzia floridana Dall, 1927
• Seguenzia formosa Jeffreys, 1876^[13]
• Seguenzia fulgida Marshall, 1983
• Seguenzia giovia Dall, 1919
• † Seguenzia glabella B. A. Marshall, 1983
• Seguenzia hapala Woodring, 1928^[14]
• Seguenzia hosyu Habe, 1953
• Seguenzia iota Marshall, 1991
• Seguenzia keikoae Poppe, Tagaro & Dekker, 2006^[15]
• Seguenzia levii Marshall, 1991
• Seguenzia lineata Watson, 1879
• Seguenzia louiseae A.H. Clarke, 1961
• Seguenzia macleani Geiger, 2017
• Seguenzia matara Marshall, 1988
• Seguenzia metivieri Marshall, 1991
• Seguenzia mirabilis Okutani, 1964
• Seguenzia monocingulata Seguenza, 1876^[16]
• Seguenzia nipponica Okutani, 1964
• Seguenzia nitida Verrill, 1884^[17]
• Seguenzia occidentalis Dall, 1908
• Seguenzia orientalis Thiele, 1925
• Seguenzia platamodes Marshall, 1991
• Seguenzia praeceps Marshall, 1991
• † Seguenzia prisca B. A. Marshall, 1983
• † Seguenzia propheta Lozouet, 1999
• Seguenzia richeri Marshall, 1991
• † Seguenzia serrata B. A. Marshall, 1983
• Seguenzia soyoae (Okutani, 1964)
• † Seguenzia statiana Sosso, Bertolaso & Dell'Angelo, 2020
• Seguenzia stegastris Marshall, 1991
• Seguenzia stephanica Dall, 1908
• Seguenzia sumatrensis Thiele, 1925
• Seguenzia textilis Marshall, 1983
• Seguenzia transenna Marshall, 1983
• Seguenzia triteia Salvador, Cavallari & Simone, 2014^[18]
• Seguenzia trochiformis Poppe, Tagaro & Dekker, 2006^[19]
• Seguenzia wareni Marshall, 1991

Species brought into synonymy

• Seguenzia caliana Dall, 1919: synonym of Seguenzia stephanica Dall, 1908
• Seguenzia carinata Jeffreys, 1876^[20] synonym of Carenzia carinata (Jeffreys, 1877)
• Seguenzia certoma Dall, 1919: synonym of Seguenzia stephanica Dall, 1908
• Seguenzia cazioti Dautzenberg, 1925: synonym of Quinnia cazioti (Dautzenberg, 1925)
• Seguenzia ionica Watson, 1878^[21] synonym of Quinnia ionica (Watson, 1878)
• Seguenzia laxa Jeffreys, 1885: synonym of Haloceras laxa (Jeffreys, 1885)
• Seguenzia megaloconcha Rokop, 1972: synonym of Seguenzia cervola Dall, 1919
• Seguenzia melvillii Schepman, 1909: synonym of Carenzia melvillii (Schepman, 1909)
• Seguenzia polita Verco, 1906: synonym of Quinnia polita (Verco, 1906)
• Seguenzia quinni J. H. McLean, 1985: synonym of Seguenzia giovia Dall, 1919
• Seguenzia reticulata (Philippi, 1844): synonym of Ancistrobasis reticulata (Philippi, 1844)
• Seguenzia rushi Dall, 1927: synonym of Quinnia rushi (, 1927)
• Seguenzia siberutensis Thiele, 1925: synonym of Halystina siberutensis (Thiele, 1925)
• Seguenzia simplex Barnard, 1963: synonym of Halystina simplex (Barnard, 1963)
• Seguenzia sykesi Schepman, 1909: synonym of Quinnia sykesi (Schepman, 1909)
• Seguenzia tricarinata Jeffreys, 1885: synonym of Haloceras tricarinata (Jeffreys, 1885)

References

1. Jeffreys, J. G. 1876. Preliminary report of the biological results of a cruise in H. M. S. 'Valorous' to Davis Strait in 1875. Proc. R. Soc. London 25: 177-230
2. Seguenzia Jeffreys, 1876. Retrieved through: World Register of Marine Species on 26 March 2013.
3. Tryon (1887), Manual of Conchology IX – Solariidae (by William B. Marshall), Ianthinidae, Trichotropidae, Scalariidae, Cerithiidae, Rissoidae, Littorinidae
4. J. Gwyn Jeffreys, Preliminary Report of the Biological Results of a Cruise in H.M.S. 'Valorous' to Davis Strait in 1875; Proceedings of the Royal Society of London, Vol. 25, (1876 - 1877), pp. 177-230
5. WoRMS : Seguenzia; accessed : 13 September 2010
6. Seguenzia antarctica Thiele, 1925. Retrieved through: World Register of Marine Species on 18 April 2010.
7. Seguenzia balicasagensis Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
8. Seguenzia beloni Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
9. Seguenzia dabfari Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
10. Seguenzia elegans Jeffreys, 1885. Retrieved through: World Register of Marine Species on 18 April 2010.
11. Seguenzia elegantissima Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
12. Seguenzia eritima A. E. Verrill, 1884. Retrieved through: World Register of Marine Species on 18 April 2010.
13. Seguenzia formosa Jeffreys, 1876. Retrieved through: World Register of Marine Species on 18 April 2010.
14. Seguenzia hapala Woodring, 1928. Retrieved through: World Register of Marine Species on 18 April 2010.
15. Seguenzia keikoae Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
16. Seguenzia monocingulata Seguenza, 1876. Retrieved through: World Register of Marine Species on 18 April 2010.
17. Seguenzia nitida A. E. Verrill, 1884. Retrieved through: World Register of Marine Species on 18 April 2010.
18. Salvador, R. B.; Cavallari, D. C.; Simone, L. R. L. (30 October 2014). "Seguenziidae (Gastropoda: Vetigastropoda) from SE Brazil collected by the Marion Dufresne (MD55) expedition". Zootaxa. 3878 (6): 536–550. doi:10.11646/zootaxa.3878.6.2. PMID 25544464.
19. Seguenzia trochiformis Poppe, Tagaro & Dekker, 2006. Retrieved through: World Register of Marine Species on 18 April 2010.
20. Seguenzia carinata Jeffreys, 1876. Retrieved through: World Register of Marine Species on 18 April 2010.
21. Seguenzia ionica Watson, 1878. Retrieved through: World Register of Marine Species on 18 April 2010.

• Quinn J.F. (1983). A revision of the Seguenziacea Verrill, 1884 (Gastropoda : Prosobranchia). I. Summary and evaluation of the superfamily, Proceedings of the Biological Society of Washington, 96(4): pp. 725–757

External links

• Jeffreys, J. G. (1876). Preliminary report of the biological results of a cruise in H.M.S. Valorous to Davis Straits in 1875. Proceedings of the Royal Society of London. 25: 177-237.
• Marshall, B. A. (1983). Recent and Tertiary Seguenziidae (Mollusca: Gastropoda) from the New Zealand region. New Zealand Journal of Zoology. 10: 235-262.
• Harris, G. F. (1897). Catalogue of Tertiary Mollusca in the Department of Geology, British Museum (Natural History). Part I. The Australasian Tertiary Mollusca. London: British Museum (Natural History). xxvi + 406 pp., 6 pls.