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Clathroctenocystis
From Fensome et al., 2019:
Clathroctenocystis, Wiggins, 1972, p.302–303.
Type: Wiggins, 1972, pl.2, figs.A–C, as Clathroctenocystis elegans.
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Original description: [Wiggins, 1972]:
Diagnosis:
Proximate fossil cysts, fusiform in shape, with a distinct apical horn. Reflected tabulation series is 1`, 6", 6c, 5```, 1p, 1````. The archeopyle is apical, and formed by the detachment of the 1` plate. Sutures are indicated or suggested by septal membranes.
Affinities:
Clathroctenocystis resembles Microdinium and Glyphanodinium. It differs from Microdinium in having one less postcingular plate (5```). It differs from Glyphanodinium in in having one extra precingular plate (6``). The presence of a posterior ventral plate in clathroctenocystis has not, as yet, been adequately demonstrated.
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Modified description:
Stover and Evitt, 1978, p. 30:
Synopsis:
Cysts proximochorate, elongate ellipsoidal with a short apical horn; paratabulation gonyaulacacean, indicated by parasutural septa; archeopyle apical, type uncertain.
Description:
Shape: Elongate ellipsoidal with a short apical horn.
Wall relationships. Autophragm only.
Wall features: Parasutural septa with smooth to minutely denticulate crests. Autophragm granulate.
Paratabulation: Indicated by parasutural features; gonyaulacacean, formula: 1`, ?, 6``, 6c, 5```, 1p, 1````. The five postcingular paraplates are interpreted as reflecting plates 2``` to 6```; additionally, the single apical paraplate probably represents four paraplates if its outline could be determined.
Archeopyle: Apical, type uncertain, but probably standard Type tA; operculum free, conical with truncated tip.
Paracingulum: Indicated by six transversely elongate, polygonal paraplates.
Parasulcus: Present mainly on hypocyst; position of apical end indicated by interruption of paracingulum.
Size: Intermediate.
Affinities:
Clathroctenocystis and Belodinium are similar in that each has an elongate ellipsoidal shape, an apical horn, and an apical archeopyle. They differ in that Belodinium is cavate with apical and antapical pericoels, whereas Clathroctenocystis has an autophragm only.
Clathroctenocystis, Wiggins, 1972, p.302–303.
Type: Wiggins, 1972, pl.2, figs.A–C, as Clathroctenocystis elegans.
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Original description: [Wiggins, 1972]:
Diagnosis:
Proximate fossil cysts, fusiform in shape, with a distinct apical horn. Reflected tabulation series is 1`, 6", 6c, 5```, 1p, 1````. The archeopyle is apical, and formed by the detachment of the 1` plate. Sutures are indicated or suggested by septal membranes.
Affinities:
Clathroctenocystis resembles Microdinium and Glyphanodinium. It differs from Microdinium in having one less postcingular plate (5```). It differs from Glyphanodinium in in having one extra precingular plate (6``). The presence of a posterior ventral plate in clathroctenocystis has not, as yet, been adequately demonstrated.
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Modified description:
Stover and Evitt, 1978, p. 30:
Synopsis:
Cysts proximochorate, elongate ellipsoidal with a short apical horn; paratabulation gonyaulacacean, indicated by parasutural septa; archeopyle apical, type uncertain.
Description:
Shape: Elongate ellipsoidal with a short apical horn.
Wall relationships. Autophragm only.
Wall features: Parasutural septa with smooth to minutely denticulate crests. Autophragm granulate.
Paratabulation: Indicated by parasutural features; gonyaulacacean, formula: 1`, ?, 6``, 6c, 5```, 1p, 1````. The five postcingular paraplates are interpreted as reflecting plates 2``` to 6```; additionally, the single apical paraplate probably represents four paraplates if its outline could be determined.
Archeopyle: Apical, type uncertain, but probably standard Type tA; operculum free, conical with truncated tip.
Paracingulum: Indicated by six transversely elongate, polygonal paraplates.
Parasulcus: Present mainly on hypocyst; position of apical end indicated by interruption of paracingulum.
Size: Intermediate.
Affinities:
Clathroctenocystis and Belodinium are similar in that each has an elongate ellipsoidal shape, an apical horn, and an apical archeopyle. They differ in that Belodinium is cavate with apical and antapical pericoels, whereas Clathroctenocystis has an autophragm only.