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Cribroperidinium delicatum
Cribroperidinium delicatum Backhouse, 1988
Holotype: Backhouse, 1988, pl.23, figs.4a-b
Locus typicus: Perth Basin, Western Australia
Stratum typicum: Late Valanginian-Hauterivian
Original description: Backhouse, 1988, p.80
Cyst proximate, ovoid? with a short apical horn and a roundcd antapex. Autophragm 1 Ám thick, finely granular. Paratabulation expressed by low granular parasutural septa, usually less than 1 Ám high, sometimes high and membranous at the paracingulum and antapex. Precingular and postcingular intratabular areas bear low accessory ridges. Paratabulation formula: 4", 6", 6c, 6""", 1p, 1"""". Paracingulum clearly expresscd, 3 to 5 Ám wide, offset approximately 8 Ám. Parasulcus, including an indeterminate number of parasulcal paraplates? expressed by low septa. Apical horn solid, granular, 6 to 15 Ám long, bearing a small preapical tip. Archeopyle precingular? type P, operculum free.
Dimensions: Length of holotype 68 Ám, width 56 Ám. Range of Iength including apical horn (14 specimens) 64(80)97 Ám, width 51(61)74 Ám.
Affinities:
Backhouse, 1988, p.80: Cribroperidinium delicatum is significantly smaller than previously described species of Cribroperidinium. It is distinguished from C. muderongense (Cookson and Eisenack) Davey 1969 by possessing lower surface features and a shorter apical horn.
Holotype: Backhouse, 1988, pl.23, figs.4a-b
Locus typicus: Perth Basin, Western Australia
Stratum typicum: Late Valanginian-Hauterivian
Original description: Backhouse, 1988, p.80
Cyst proximate, ovoid? with a short apical horn and a roundcd antapex. Autophragm 1 Ám thick, finely granular. Paratabulation expressed by low granular parasutural septa, usually less than 1 Ám high, sometimes high and membranous at the paracingulum and antapex. Precingular and postcingular intratabular areas bear low accessory ridges. Paratabulation formula: 4", 6", 6c, 6""", 1p, 1"""". Paracingulum clearly expresscd, 3 to 5 Ám wide, offset approximately 8 Ám. Parasulcus, including an indeterminate number of parasulcal paraplates? expressed by low septa. Apical horn solid, granular, 6 to 15 Ám long, bearing a small preapical tip. Archeopyle precingular? type P, operculum free.
Dimensions: Length of holotype 68 Ám, width 56 Ám. Range of Iength including apical horn (14 specimens) 64(80)97 Ám, width 51(61)74 Ám.
Affinities:
Backhouse, 1988, p.80: Cribroperidinium delicatum is significantly smaller than previously described species of Cribroperidinium. It is distinguished from C. muderongense (Cookson and Eisenack) Davey 1969 by possessing lower surface features and a shorter apical horn.