Borsonia is a genus of sea snails, marine gastropod mollusks in the family Borsoniidae. Description The fusiform shell has medium to small size. It has an elevated spire and a well-marked siphonal canal. The whorls of the spire are usually angulated near the middle. On this angle they show elongated nodes or axial ribs. These nodes disappear almost completely at the last section of the body whorl. The sutures are distinct. The aperture is elongate and is about half as long as the shell. The simple outer lip curves back near the top and forms a deep notch. The columella is nearly straight and has none, one or two strong plications on the upper half. The anal sinus of the outer lip is not deep The sinus area between and the strong sutural cord are well excavated. There is an opening in the infrasutural depression of the body whorl. Distribution At considerable depths in the subtropical and temperate waters of the Pacific Ocean and the Atlantic Ocean; in shallower boreal waters. Species Species within the genus Borsonia include: Borsonia armata Boettger, 1895 Borsonia brasiliana Tippett, 1983 Borsonia ceroplasta (Watson, 1881) † Borsonia cliffdenensis H. Finlay, 1930 † Borsonia crassiaxialis Maxwell, 1992 Borsonia epigona Martens, 1901 Borsonia hirondelleae (Dautzenberg, 1891) Borsonia jaffa Cotton, 1947 Borsonia jaya Sysoev, 1997 † Borsonia meridionalis Lozouet, 2017 † Borsonia mitromorphoides Suter, 1917 Borsonia ochracea Thiele, 1925 † Borsonia prima Bellardi, 1839 † Borsonia pulchra Peyrot, 1931 Borsonia saccoi Dall, 1908 Borsonia silicea (Watson, 1881) Borsonia smithi Schepman, 1913 Borsonia symbiophora Sysoev, 1996 Borsonia symbiotes (Wood-Mason & Alcock, 1891) Borsonia syngenes (Watson, 1881) Borsonia timorensis (Schepman, 1913) † Borsonia zelandica (P. Marshall, 1919) Species brought into synonymy Borsonia agassizii Dall, 1908 : synonym of Borsonella agassizii (Dall, 1908) Borsonia bifasciata Pease, 1860 : synonym of Kermia bifasciata (Pease, 1860) † Borsonia brachyspira Suter, 1917: synonym of † Mitromorpha brachyspira (Suter, 1917) Borsonia coronadoi Dall, 1908: synonym of Borsonella coronadoi (Dall, 1908) Borsonia crassicostata Pease, 1860: synonym of Lienardia crassicostata (Pease, 1860) Borsonia diegensis Dall, 1908 : synonym of Borsonella diegensis (Dall, 1908) † Borsonia inculta Moody, 1916: synonym of Pseudotaranis strongi (Arnold, 1903) Borsonia lutea Pease, 1860: synonym of Kermia lutea (Pease, 1860) Borsonia nebulosa Pease, 1860 synonym of Pseudodaphnella nebulosa (Pease, 1860) Borsonia rouaultii Dall, 1889: synonym of Cordieria rouaultii (Dall, 1889) References Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J.