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Hystrichodinium dasum
Hystrichodinium? dasum Davey, 1969a
Originally Hystrichodinium subsequently (and now) Hystrichodinium?.
Stover and Evitt, 1978, considered this to be a provisionally accepted species of Hystrichodinium.
Principle 5 of the I.C.B.N. states that "... names of taxonomic groups are treated as Latin regardless of their origin." Thus, the epithet "dasys" should be Latinized to "dasus", with the neuter form being "dasum".
Holotype: Davey, 1969, pl.10, fig.8
Locus typicus: Escalles, France
Stratum typicum: Cenomanian
Original diagnosis: Davey, 1969, p. 176
Shell subspherical, thin-walled, smooth or slightly granular. Tabulation very faintly marked; cingulum, and more rarely, precingular and postcingular plate boundaries visible. Processes numerous, short, fine and flexuous, aligned along plate boundaries, also intratabular. Archaeopyle not observed.
Dimensions: diameter of central body 42 (53) 70 Ám, maximum length of processes 7 (10.6) 14Ám.
Original description: Davey, 1969, p. 176
The shell, being thin-walled, is always found deformed. Only two specimens possess a faint tabulation. This is best seen in the holotype which has a clear but lightly defined cingulum and two or three precingular and postcingular plate boundaries visible. Tne numerous processes are hair-like, approximately 0.2 Ám wide for most of their length, probably hollow and terminate with a point. The most characteristic feature of the proccsscs is their extreme flexibility.
Affinities:
Davey, 1969, p. 176: The characteristic processes and the presence of a tabulation differentiate H. dasys very easily from all previously described microplankton species.
Originally Hystrichodinium subsequently (and now) Hystrichodinium?.
Stover and Evitt, 1978, considered this to be a provisionally accepted species of Hystrichodinium.
Principle 5 of the I.C.B.N. states that "... names of taxonomic groups are treated as Latin regardless of their origin." Thus, the epithet "dasys" should be Latinized to "dasus", with the neuter form being "dasum".
Holotype: Davey, 1969, pl.10, fig.8
Locus typicus: Escalles, France
Stratum typicum: Cenomanian
Original diagnosis: Davey, 1969, p. 176
Shell subspherical, thin-walled, smooth or slightly granular. Tabulation very faintly marked; cingulum, and more rarely, precingular and postcingular plate boundaries visible. Processes numerous, short, fine and flexuous, aligned along plate boundaries, also intratabular. Archaeopyle not observed.
Dimensions: diameter of central body 42 (53) 70 Ám, maximum length of processes 7 (10.6) 14Ám.
Original description: Davey, 1969, p. 176
The shell, being thin-walled, is always found deformed. Only two specimens possess a faint tabulation. This is best seen in the holotype which has a clear but lightly defined cingulum and two or three precingular and postcingular plate boundaries visible. Tne numerous processes are hair-like, approximately 0.2 Ám wide for most of their length, probably hollow and terminate with a point. The most characteristic feature of the proccsscs is their extreme flexibility.
Affinities:
Davey, 1969, p. 176: The characteristic processes and the presence of a tabulation differentiate H. dasys very easily from all previously described microplankton species.