Borsonia is a genus of sea snails, marine gastropod mollusks in the family Borsoniidae.
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.
At considerable depths in the subtropical and temperate waters of the Pacific Ocean and the Atlantic Ocean; in shallower boreal waters.
Species within the genus Borsonia include:
Borsonia armata Boettger, 1895Borsonia brasiliana Tippett, 1983Borsonia ceroplasta (Watson, 1881)† Borsonia cliffdenensis H. Finlay, 1930† Borsonia crassiaxialis Maxwell, 1992Borsonia epigona Martens, 1901Borsonia hirondelleae (Dautzenberg, 1891)Borsonia jaffa Cotton, 1947Borsonia jaya Sysoev, 1997† Borsonia mitromorphoides Suter, 1917Borsonia ochracea Thiele, 1925Borsonia saccoi Dall, 1908Borsonia silicea (Watson, 1881)Borsonia smithi Schepman, 1913Borsonia symbiophora Sysoev, 1996Borsonia symbiotes (Wood-Mason & Alcock, 1891)Borsonia syngenes (Watson, 1881)Borsonia timorensis (Schepman, 1913)† Borsonia zelandica (P. Marshall,1919)Species brought into synonymyBorsonia agassizii Dall, 1908 : synonym of Borsonella agassizii (Dall, 1908)Borsonia bifasciata Pease, 1860 : synonym of Kermia bifasciata (Pease, 1860)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)
