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Circulodinium distinctum
Circulodinium distinctum, (Deflandre and Cookson, 1955), Jansonius, 1986
Taxonomic junior synonym: Circulodinium deflandrei, according to Millioud (1969, p.427) and Harker and Sarjeant in Harker et al. (1990, p.80) - however, Fauconnier and Londeix in Fauconnier and Masure (2004, p.114) retained Circulodinium deflandrei.
Holotype: Deflandre and Cookson, 1955, pl. 2, fig. 14
Locus typicus: Gingin, W Australia
Stratum typicum: Senonian
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Original description as Cyclonephelium distinctum: [Deflandre and Cookson, 1955, p. 285-286]:
Description:
Ornamentation typically consisting of numerous short, solid appendages of variable width, the apices of which are either bluntly pointed, capitate, enlarged, or forked; rarely the processes are joined to one another forming short lamellae. They are irregularly disposed, most numerous at the equator and becoming progressively fewer towards the poles, from which they are entirely absent. Surface of shell distinctly punctate.
Dimensions:
Diameter of shell, 64-97 µm, length of appendages 2.5-18 µm.
Affinities:
It is sometimes difficult to separate C. compactum from C. distinctum, surely two closely related species, but when a series of individuals is observed the distinction between them becomes clear. In a few examples of C. distinctum lamella-like appendages have been observed amongst the typical processes of this species, but so far isolated appendages similar to those of C. distinctum have not been seen in C. compactum.
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Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Circulodinium distinctum (Deflandre and Cookson, 1955) Jansonius, 1986, has numerous short solid processes of variable width, the tips of which are bluntly pointed, capitate, or bifurcate. Processes occasionally joined.
Size: diameter 64-97 µm, processes 2.5-18 µm.
Taxonomic junior synonym: Circulodinium deflandrei, according to Millioud (1969, p.427) and Harker and Sarjeant in Harker et al. (1990, p.80) - however, Fauconnier and Londeix in Fauconnier and Masure (2004, p.114) retained Circulodinium deflandrei.
Holotype: Deflandre and Cookson, 1955, pl. 2, fig. 14
Locus typicus: Gingin, W Australia
Stratum typicum: Senonian
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Original description as Cyclonephelium distinctum: [Deflandre and Cookson, 1955, p. 285-286]:
Description:
Ornamentation typically consisting of numerous short, solid appendages of variable width, the apices of which are either bluntly pointed, capitate, enlarged, or forked; rarely the processes are joined to one another forming short lamellae. They are irregularly disposed, most numerous at the equator and becoming progressively fewer towards the poles, from which they are entirely absent. Surface of shell distinctly punctate.
Dimensions:
Diameter of shell, 64-97 µm, length of appendages 2.5-18 µm.
Affinities:
It is sometimes difficult to separate C. compactum from C. distinctum, surely two closely related species, but when a series of individuals is observed the distinction between them becomes clear. In a few examples of C. distinctum lamella-like appendages have been observed amongst the typical processes of this species, but so far isolated appendages similar to those of C. distinctum have not been seen in C. compactum.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Notes:
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Circulodinium distinctum (Deflandre and Cookson, 1955) Jansonius, 1986, has numerous short solid processes of variable width, the tips of which are bluntly pointed, capitate, or bifurcate. Processes occasionally joined.
Size: diameter 64-97 µm, processes 2.5-18 µm.