Cosmasyrinx is an extinct genus of sea snails, marine gastropod mollusks, unassigned to a family within the superfamily Conoidea.MolluscaBase eds. (2026). MolluscaBase. Cosmasyrinx Marwick, 1931 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=828268 on 2026-07-25
Species Species within the genus Cosmasyrinx include: † Cosmasyrinx antarctigera Stilwell, Zinsmeister & Oleinik, 2004 † Cosmasyrinx ardua Marwick, 1931 † Cosmasyrinx dolorosa (Finlay & Marwick, 1937) † Cosmasyrinx latior Marwick, 1931 † Cosmasyrinx levicristata Darragh, 1997 † Cosmasyrinx makiyamai Shuto, 1961 (uncertain > unassessed) † Cosmasyrinx marwicki Beu, 1970 † Cosmasyrinx monilifera Marwick, 1931 † Cosmasyrinx tereumera Marwick, 1931
Synonyms † Cosmasyrinx brychiosinus Stilwell & Zinsmeister, 1992: synonym of † Cochlespira brychiosinus (Stilwell & Zinsmeister, 1992) † Cosmasyrinx semilirata A. W. B. Powell, 1942: synonym of † Cryptodaphne semilirata (A. W. B. Powell, 1942) (superseded combination)
References
Marwick, J. (1931). The Tertiary Mollusca of the Gisborne District. New Zealand Geological Survey Paleontological Bulletin 13:1-177. 18: pls. Finlay, H. J. & Marwick, J. (1937). The Wangaloan and associated molluscan faunas of Kaitangata-Green Island subdivision. New Zealand Geological Survey Palæontological Bulletin. 15, 1–140, 18 pls.