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Leiosphaeridia asymmetrica
Leiosphaeridia asymmetrica Pocock, 1972
NOW Pilosidinium. Originally Leiosphaeridia, subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Taxonomic junior synonym: Sentusidinium (as Pilosidinium) fibrosum, according to Courtinat in Fauconnier and Masure, 2004, p.447.
Holotype: Pocock, 1972, pl.26, fig.29
Locus typicus: Royalite DeWinton, Western Canada
Stratum typicum: Late Bajocian
Original description: Pocock, 1972, p.107
Vesicle spherical, extended at one end in the form of a conical process about 5.0µ long and with a basal width of 5.0µ; densely spinose; spines pinnate; less than 0.5µ wide and 2.5--3.0µ long; spines spaced about 1.0µ apart over most of the vesicle but less closely packed over an area about 5.0µ wide situated immediately below the process frequent tears around the vesicle at the base of the process together with its complete absence from many specimens, suggests apical archeopyle formation; vesicle very thin; singlelayered; colourless to pale yellow; size range 35.2 (36.6) 40.0 x 27.0 (31.0) 33.0µ.
Affinities:
Pocock, 1972, p.107: Pyriform shape and dense covering of spines characterize L. asymmetrica. The possible presence of an archeopyle suggests possible dinoflagellate affinity.
NOW Pilosidinium. Originally Leiosphaeridia, subsequently Sentusidinium, thirdly (and now) Pilosidinium.
Taxonomic junior synonym: Sentusidinium (as Pilosidinium) fibrosum, according to Courtinat in Fauconnier and Masure, 2004, p.447.
Holotype: Pocock, 1972, pl.26, fig.29
Locus typicus: Royalite DeWinton, Western Canada
Stratum typicum: Late Bajocian
Original description: Pocock, 1972, p.107
Vesicle spherical, extended at one end in the form of a conical process about 5.0µ long and with a basal width of 5.0µ; densely spinose; spines pinnate; less than 0.5µ wide and 2.5--3.0µ long; spines spaced about 1.0µ apart over most of the vesicle but less closely packed over an area about 5.0µ wide situated immediately below the process frequent tears around the vesicle at the base of the process together with its complete absence from many specimens, suggests apical archeopyle formation; vesicle very thin; singlelayered; colourless to pale yellow; size range 35.2 (36.6) 40.0 x 27.0 (31.0) 33.0µ.
Affinities:
Pocock, 1972, p.107: Pyriform shape and dense covering of spines characterize L. asymmetrica. The possible presence of an archeopyle suggests possible dinoflagellate affinity.