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Cyclonephelium paucispinum
Cyclonephelium paucispinum Davey, 1969
NOW Circulodinium. Originally Cyclonephelium, subsequently (and now) Circulodinium. Age: Cenomanian
Holotype: Davey 1969, pl. 9, fig. 1
Locus typicus: BRGM Borehole Escalles, Pas de Calais, NW France
Stratum typicum: Cenomanian
Translation Yun, 1981: LPP
Original description: Davey, 1969, p. 170
Diagnosis: Shell subpolygonal in outline with well defined antapical horn. Shell wall lightly to coarsely granular, bearing small number of irregularly distributed processes confined to peripheral region of shell. Processes of moderate size, solid and widening distally. Apical archeopyle with a zigzag margin and sulcal notch.
Dimensions: Holotype: length of shell (operculum missing) 54 Ám, width 81 Ám, length of processes 1.5-12 Ám.
Range: length of shell (operculum missing) 40(72.4)92 Ám, width 54(87.0)112 Ám, maximum length of processes (5(10.2)19 Ám. 12 specimens measured.
Description: The shell is subpolygonal in outline, the cingular region being the widest portion of the shell. Posteriorly there is a pointed antapical horn. The few processes present are of moderate size and if close together tend to anastomose both distally and proximally.
Supplemental description: Yun, 1981, p. 54
Dimensions: maximum size central body: 70-96 Ám, maximum length of spines: c. 6 Ám, number of spines: c. 100.
Description: Like in c. compactum and C. distinctum, the spine-free, narrow and slightly indented parasulcal zone and 6 precingular paraplates, which can be reconstructed through the 7 joints between the convex "wedges", were observed also in this species. The narrow, slightly spiral paracingulum is marked by spines, which are arranged on the margins of the cingulum.
Affinities:
Davey, 1969, p. 170
The large size, the paucity of processes and the subpolygonal shape of the shell distinguish C. paucispinum sp. nov. from all previously described species. The processes most closely resemble those of C. distinctum but are fewer in number.
Yun, 1981, p. 54
In this species, the number of spines varies, so that transitional forms to C. brevispinatum are also found. The difference with latter species is (1) the irregular distribution of the spines, which are accumulated in planes, (2) generally 5 Ám long and sometimes very broad spines, (3) the presence of wart-shaped spines in some specimens.
NOW Circulodinium. Originally Cyclonephelium, subsequently (and now) Circulodinium. Age: Cenomanian
Holotype: Davey 1969, pl. 9, fig. 1
Locus typicus: BRGM Borehole Escalles, Pas de Calais, NW France
Stratum typicum: Cenomanian
Translation Yun, 1981: LPP
Original description: Davey, 1969, p. 170
Diagnosis: Shell subpolygonal in outline with well defined antapical horn. Shell wall lightly to coarsely granular, bearing small number of irregularly distributed processes confined to peripheral region of shell. Processes of moderate size, solid and widening distally. Apical archeopyle with a zigzag margin and sulcal notch.
Dimensions: Holotype: length of shell (operculum missing) 54 Ám, width 81 Ám, length of processes 1.5-12 Ám.
Range: length of shell (operculum missing) 40(72.4)92 Ám, width 54(87.0)112 Ám, maximum length of processes (5(10.2)19 Ám. 12 specimens measured.
Description: The shell is subpolygonal in outline, the cingular region being the widest portion of the shell. Posteriorly there is a pointed antapical horn. The few processes present are of moderate size and if close together tend to anastomose both distally and proximally.
Supplemental description: Yun, 1981, p. 54
Dimensions: maximum size central body: 70-96 Ám, maximum length of spines: c. 6 Ám, number of spines: c. 100.
Description: Like in c. compactum and C. distinctum, the spine-free, narrow and slightly indented parasulcal zone and 6 precingular paraplates, which can be reconstructed through the 7 joints between the convex "wedges", were observed also in this species. The narrow, slightly spiral paracingulum is marked by spines, which are arranged on the margins of the cingulum.
Affinities:
Davey, 1969, p. 170
The large size, the paucity of processes and the subpolygonal shape of the shell distinguish C. paucispinum sp. nov. from all previously described species. The processes most closely resemble those of C. distinctum but are fewer in number.
Yun, 1981, p. 54
In this species, the number of spines varies, so that transitional forms to C. brevispinatum are also found. The difference with latter species is (1) the irregular distribution of the spines, which are accumulated in planes, (2) generally 5 Ám long and sometimes very broad spines, (3) the presence of wart-shaped spines in some specimens.