Back
Turbiosphaera filosa
Turbiosphaera filosa (Wilson, 1967) Archangelsky, 1969
Originally Cordosphaeridium, subsequently (and now) Turbiosphaera.
Holotype: Wilson, 1967, figs.2b,32
Locus typicus: Erratics near Minna Bluff, McMurdo Sound, Antarctica
Stratum typicum: Paleocene-Oligocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Turbiosphaera filosa (Wilson, 1967a) Archangelsky, 1969a, has a fibrous periphragm with 20-24 broad, flat, non-tubular fibrous processes, 8-26 µm in length. The longest and broadest processes are at the poles, those at the equator are about half as long. Polar processes pointed, others usually flat-topped. Ventral processes much smaller than dorsal processes. Laevorotatory girdle defined by whorl of 6-8 processes whose long narrow bases are aligned parallel to the equator. This species is similar to Forma F of Evitt (1961). Size: 96-138 µm long, 69-96 µm broad
--------------------------------------------------
Original description Wilson, 1967, p.66: Cordosphaeridium filosum
Test bi- layered comprising fibrous outer cyst and smooth oval inner cyst. Outer cyst extended radially to form 20-24 broad, flat, non-tabular fibrous processes (l = 8-26µm. The longest and broadest being at the poles; processes of equatorial region about one half as long as polar processes; polar processes usually pointed, the other flat-tipped; ventral processes much smaller than those on dorsal surface. Laevorotatory transverse girdle clearly defined by whorl of 6-8 processes whose long, narrow bases are aligned parallel to the equator. Archaeopyle large, subrounded, precingular, located on dorsal epitheca.
Dimensions: Holotype l = 102 µm, b = 69 µm, dimensions of inner cyst (61x52) µm.
Range l = 96(107)138 µm, b = 69(81)96 µm (6 specimens)
Affinities: Wilson, 1967, p.66
C. filosum differs considerably from all other described species of Cordosphaeridium in the distribution, size and shape of the processes. Antarctic specimens are very similar to if not identical with the American Eocene forms described as Forma F by Evitt, 1961 who discussed the characteristic features of the species but gave no formal description. The genus Cordosphaeridium Eisenack had not been erected at the time of publication of Evitt's work. C. filosum was recorded as C. cf. inodes in the preliminary species list of McIntyre and Wilson, 1966.
Originally Cordosphaeridium, subsequently (and now) Turbiosphaera.
Holotype: Wilson, 1967, figs.2b,32
Locus typicus: Erratics near Minna Bluff, McMurdo Sound, Antarctica
Stratum typicum: Paleocene-Oligocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Turbiosphaera filosa (Wilson, 1967a) Archangelsky, 1969a, has a fibrous periphragm with 20-24 broad, flat, non-tubular fibrous processes, 8-26 µm in length. The longest and broadest processes are at the poles, those at the equator are about half as long. Polar processes pointed, others usually flat-topped. Ventral processes much smaller than dorsal processes. Laevorotatory girdle defined by whorl of 6-8 processes whose long narrow bases are aligned parallel to the equator. This species is similar to Forma F of Evitt (1961). Size: 96-138 µm long, 69-96 µm broad
--------------------------------------------------
Original description Wilson, 1967, p.66: Cordosphaeridium filosum
Test bi- layered comprising fibrous outer cyst and smooth oval inner cyst. Outer cyst extended radially to form 20-24 broad, flat, non-tabular fibrous processes (l = 8-26µm. The longest and broadest being at the poles; processes of equatorial region about one half as long as polar processes; polar processes usually pointed, the other flat-tipped; ventral processes much smaller than those on dorsal surface. Laevorotatory transverse girdle clearly defined by whorl of 6-8 processes whose long, narrow bases are aligned parallel to the equator. Archaeopyle large, subrounded, precingular, located on dorsal epitheca.
Dimensions: Holotype l = 102 µm, b = 69 µm, dimensions of inner cyst (61x52) µm.
Range l = 96(107)138 µm, b = 69(81)96 µm (6 specimens)
Affinities: Wilson, 1967, p.66
C. filosum differs considerably from all other described species of Cordosphaeridium in the distribution, size and shape of the processes. Antarctic specimens are very similar to if not identical with the American Eocene forms described as Forma F by Evitt, 1961 who discussed the characteristic features of the species but gave no formal description. The genus Cordosphaeridium Eisenack had not been erected at the time of publication of Evitt's work. C. filosum was recorded as C. cf. inodes in the preliminary species list of McIntyre and Wilson, 1966.