Cassidulina is a genus of foraminifera described in the Treatise Part C. (Loeblich & Tappan, 1964), as having a free, lenticular test, with central boss of clear calcite on either side. Chambers are biserially arranged, enrolled planispirally with a subangular to keeled periphery. The wall is calcareous, hyaline (glassy), optically granular, perforate. The surface is smooth with a polished appearance. Sutures are radial to oblique, straight or curved. The aperture is a narrow arched slip at the base of the apertural face, partly closed by an apertural place. (Loeblich and Tappan 1988)
The taxonomy of Cassidulina is rather stable, and is included in the Cassidulinidae at least as far back as Cushman, 1950. Related genera include Cassidulinella, Favocassidulina, Globocassidulina, and Buriela. Cassidulina, itself, is cosmopolitan, with a stratigraphic range extending from the Upper Eocene to recent.
Species
Cassidulina albemariensis McCulloch, 1977 Cassidulina alternans Yabe & Hanzawa, 1925 Cassidulina asanoi Uchio, 1950 Cassidulina bradshawi Uchio, 1960 Cassidulina braziliensis Cushman, 1922 Cassidulina caledoniana McCulloch, 1981 Cassidulina carapitana Hedberg, 1937 † Cassidulina carinata Silvestri, 1896 Cassidulina costatula Cushman, 1933 Cassidulina cretacea Cushman, 1931 Cassidulina crustosa Saidova, 1975 Cassidulina curvata Phleger & Parker, 1951 Cassidulina curvatiformis McCulloch, 1977 Cassidulina cushmani R.E. & K.C. Stewart, 1930 Cassidulina deafueraensis McCulloch, 1977 Cassidulina delicatiformis (McCulloch, 1977) Cassidulina detierraensis McCulloch, 1977 Cassidulina differens McCulloch, 1977 Cassidulina elegantissima Cushman, 1925 Cassidulina globosa Hantken, 1865 Cassidulina hoodensis McCulloch, 1977 Cassidulina inflatiformis McCulloch, 1977 Cassidulina insueta Cushman, 1947 Cassidulina izuensis Aoki, 1967 Cassidulina kasiwazakiensis Husezima & Maruhasi, 1944 Cassidulina laevigata d'Orbigny, 1826 Cassidulina limbata Cushman & Hughes, 1925 Cassidulina lineocorrugata McCulloch, 1977 Cassidulina lobulata McCulloch, 1977 Cassidulina lomitensis Galloway & Wissler, 1927 Cassidulina margareta Karrer, 1877 † Cassidulina marshallana Todd, 1954 Cassidulina moluccensis Germeraad, 1946 Cassidulina monicaniformis McCulloch, 1977 Cassidulina monstruosa Voloshinova, 1952 † Cassidulina neoteretis Seidenkrantz, 1995 Cassidulina norvangi Thalmann, 1952 Cassidulina obtusa Williamson, 1858 Cassidulina oshimai Aoki, 1967 Cassidulina palmerae Bermúdez & Acosta, 1940 Cassidulina patula Cushman, 1933 Cassidulina penangensis McCulloch, 1977 Cassidulina perumbonata Keyzer, 1953 Cassidulina pilasensis McCulloch, 1977 Cassidulina planata Saidova, 1975 Cassidulina planulata McCulloch, 1977 Cassidulina pulchella d'Orbigny, 1839 Cassidulina quadrata Cushman & Hughes, 1925 Cassidulina radiata Chave, 1987 Cassidulina rarilocula Cushman, 1933 Cassidulina reniforme Nørvangi, 1945 Cassidulina seca McCulloch, 1977 Cassidulina simpsonsbayensis McCulloch, 1977 Cassidulina spiniferiformis McCulloch, 1977 Cassidulina spiralis Natland, 1938 Cassidulina striatostoma Zheng, 1979 Cassidulina subcalifornica Drooger, 1953 Cassidulina subcarinata Uchio, 1960 Cassidulina sublaevigata Hofker, 1956 Cassidulina sublimbata Asano & Nakamura, 1937 Cassidulina subtumida Cushman, 1933 Cassidulina teretis Tappan, 1951 Cassidulina tortuosa Cushman & Hughes, 1925 Cassidulina translucens Cushman & Hughes, 1925 Cassidulina tumida Natland, 1938 Cassidulina velaensis McCulloch, 1981 Cassidulina victoriensis Collins, 1974 Cassidulina vulgata McCulloch, 1977 Cassidulina wakasaensis Asano & Nakamura, 1937 Cassidulina weinmanensis McCulloch, 1977 Cassidulina wordeni McCulloch, 1977 Cassidulina wrangellensis McCulloch, 1977 Cassidulina yabei Asano & Nakamura, 1937
References
Joseph A. Cushman, 1950. Foraminifera, their classification and economic use. Harvard University Press, Cambridge, Massachusetts. 4th edition, 1950 Alfred R. Loeblich, Jr. and Helen Tappan, 1964. Sarcodina, chiefy "Thecamoebians" and Foraminiferida. Treatise on Invertebrate Paleontology, Part C, Protista 2. Geological Society of America and University of Kansas Press, 1964. Alfred R. Loeblich, Jr. and Helen Tappan, 1988. Forminiferal Genera and their classification. Geological Survey of Iran, (e-book) 2005.
External links
Cassidulina at the World Register of Marine Species (WoRMS)