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Palaeoperidinium castanea
Palaeoperidinium castanea Deflandre, 1935
Name not validly published: generic name not validly published until 1967.
NOW Trichodinium. Originally Palaeoperidinium (name not validly published), subsequently (and now) Trichodinium.
Taxonomic senior synonyms: Apteodinium (as Trichodinium) ciliatum and Trichodinium intermedium, both by implication in Clarke and Verdier (1967, p.19), who believed Trichodinium castanea to be the senior name — however, subsequent workers have retained the three species (e.g. see Morgan, 1980, p.33 and Harding, 1990b, p.38). A full description of this species is given in Deflandre (1936b, p.177).
Holotype: Deflandre, 1935, pl.6, fig.8; Deflandre, 1936, pl.6, fig.1; Jan du Chene et al., 1986, pl. 122, figs.9-10
Age: Erratic, ?Senonian
Translation Deflandre 1935: LPP
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Deflandre 1935, p. 229, PL.6, fig.8
Palaeoperidinium castanea
Diagnosis: The theca is spherical, sometimes spheroidal, slightly flattened or, on the contrary, a little ellipsoidal; it is divided in two equal parts by the transverse furrow, which is helicoidal and laevorotatory. The longitudinal furrow, which is perpendicular to it, is larger on the hypotheca than on the epitheca, but it seems to extend equally on both. At the apex, there is a bunch of strong, slightly divergent spines. The entire theca is covered with spines which, depending on the specimen, appear to be more or less dense. Generally, these spines are more numerous and stronger where the plate sutures would be located, and of which traces are found.
Dimensions: diameter generally about 45 µm, range 45-65 µm.
Name not validly published: generic name not validly published until 1967.
NOW Trichodinium. Originally Palaeoperidinium (name not validly published), subsequently (and now) Trichodinium.
Taxonomic senior synonyms: Apteodinium (as Trichodinium) ciliatum and Trichodinium intermedium, both by implication in Clarke and Verdier (1967, p.19), who believed Trichodinium castanea to be the senior name — however, subsequent workers have retained the three species (e.g. see Morgan, 1980, p.33 and Harding, 1990b, p.38). A full description of this species is given in Deflandre (1936b, p.177).
Holotype: Deflandre, 1935, pl.6, fig.8; Deflandre, 1936, pl.6, fig.1; Jan du Chene et al., 1986, pl. 122, figs.9-10
Age: Erratic, ?Senonian
Translation Deflandre 1935: LPP
------------------------------------
Deflandre 1935, p. 229, PL.6, fig.8
Palaeoperidinium castanea
Diagnosis: The theca is spherical, sometimes spheroidal, slightly flattened or, on the contrary, a little ellipsoidal; it is divided in two equal parts by the transverse furrow, which is helicoidal and laevorotatory. The longitudinal furrow, which is perpendicular to it, is larger on the hypotheca than on the epitheca, but it seems to extend equally on both. At the apex, there is a bunch of strong, slightly divergent spines. The entire theca is covered with spines which, depending on the specimen, appear to be more or less dense. Generally, these spines are more numerous and stronger where the plate sutures would be located, and of which traces are found.
Dimensions: diameter generally about 45 µm, range 45-65 µm.