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Phthanoperidinium coriciterium
Phthanoperidinium coriciterium Islam, 1982
Holotype: Islam, 1982, pl.1, fig.8
Locus typicus: Bracklesham Bay, southern England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1982, p.307, 309
The cyst has a trim-looking compressed peridinioid form with a minute apical horn and two similarly minute antapical lobes or without; longish or roundish in shape; proximate; acavate or cornucavate; composed of periphragm and endophragm which are at times adpressed to look like an autophragm only, both phragma are very thin, the periphragm is mildly chagrinate or granulate; periphragmal thickenings and folds always define the paracingulum and often the paratabulation as 4", 3a, 7", ?5c, 5""", 2"""", xs; archeopyle compound type [I(2a)P(4")], operculum free or adherent with visible accessory suture, paraplate 4" is rectangular while paraplate 2a is pentagonal, the shape of both being longitudinally symmetrical; paracingulum slightly helicoidal, may be slightly sunken; parasulcus indicated by a shallow depression which is broad posteriorly and may extend across the paracingulum. Dimensions: Holotype: pericyst 37 X 36 µm. Range: pericyst length 40(36)32 µm, breadth 36(33)31 µm. Specimens measured 15.
Holotype: Islam, 1982, pl.1, fig.8
Locus typicus: Bracklesham Bay, southern England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1982, p.307, 309
The cyst has a trim-looking compressed peridinioid form with a minute apical horn and two similarly minute antapical lobes or without; longish or roundish in shape; proximate; acavate or cornucavate; composed of periphragm and endophragm which are at times adpressed to look like an autophragm only, both phragma are very thin, the periphragm is mildly chagrinate or granulate; periphragmal thickenings and folds always define the paracingulum and often the paratabulation as 4", 3a, 7", ?5c, 5""", 2"""", xs; archeopyle compound type [I(2a)P(4")], operculum free or adherent with visible accessory suture, paraplate 4" is rectangular while paraplate 2a is pentagonal, the shape of both being longitudinally symmetrical; paracingulum slightly helicoidal, may be slightly sunken; parasulcus indicated by a shallow depression which is broad posteriorly and may extend across the paracingulum. Dimensions: Holotype: pericyst 37 X 36 µm. Range: pericyst length 40(36)32 µm, breadth 36(33)31 µm. Specimens measured 15.