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Clathroctenocystis asaphes
Clathroctenocystis asapha (Drugg, 1978) Stover and Helby, 1987
Holotype: Drugg, 1978, pl.2, fig.8
Locus typicum: Warboys Brick pit, Huntingtonshire, England
Stratum typicum: Oxfordian
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Original description as Belodinium asaphum: [Drugg, 1978, p. 63-64]:
Diagnosis:
Cyst elongate with an apical archeopyle.
Paratabulation crudely indicated by about seven somewhat ridge-like parasutural crests on the periphragm. Six precingular paraplates are suggested by the zigzag edges of the archeopyle. A paracingulum is represented by interruptions and irregularities in the longitudinal ridges. It is located about midway between the apex and the antapex of the cyst body. The paratabulation is almost undoubtedly gonyaulacoid although the exact details could not be determined with any degree of confidence.
The periphragm extends beyond the endophragm antapically to form a bag-like protrusion. Sometimes there is an elliptical opening on the ventral side of this protrusion. Both endophragm and periphragm are thin and smooth to faintly granulate.
A short apical horn or pericoel is present on one specimen. The other specimens do not show any indication of an apical horn or extension.
Dimensions:
The overall cyst length ranges from 50 to 75 µm and the width from 25 to 40 µm.
Affinities:
This species differs from both Belodinium dysculum Cookson and Eisenack, 1960, and B. obsoletum (Dodekova, 1975), by exhibiting much more crudely developed paratabulation and by lacking an apical horn.
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Poulsen 1996, p. 87, Pl. 26, Fig. 12:
Remarks:
This specimen bears some resemblance to Clathroctenocystis asapha (Drugg 1978) Stover and Helby 1987 which, however, has been recorded only from the Late Callovian to earliest Kimmeridgian of Britain (Riding and Thomas, 1992). The specimen recorded in this study is from the late Early Volgian of Poland (Antoninow-Skorkowka borehole).
Holotype: Drugg, 1978, pl.2, fig.8
Locus typicum: Warboys Brick pit, Huntingtonshire, England
Stratum typicum: Oxfordian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Belodinium asaphum: [Drugg, 1978, p. 63-64]:
Diagnosis:
Cyst elongate with an apical archeopyle.
Paratabulation crudely indicated by about seven somewhat ridge-like parasutural crests on the periphragm. Six precingular paraplates are suggested by the zigzag edges of the archeopyle. A paracingulum is represented by interruptions and irregularities in the longitudinal ridges. It is located about midway between the apex and the antapex of the cyst body. The paratabulation is almost undoubtedly gonyaulacoid although the exact details could not be determined with any degree of confidence.
The periphragm extends beyond the endophragm antapically to form a bag-like protrusion. Sometimes there is an elliptical opening on the ventral side of this protrusion. Both endophragm and periphragm are thin and smooth to faintly granulate.
A short apical horn or pericoel is present on one specimen. The other specimens do not show any indication of an apical horn or extension.
Dimensions:
The overall cyst length ranges from 50 to 75 µm and the width from 25 to 40 µm.
Affinities:
This species differs from both Belodinium dysculum Cookson and Eisenack, 1960, and B. obsoletum (Dodekova, 1975), by exhibiting much more crudely developed paratabulation and by lacking an apical horn.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Poulsen 1996, p. 87, Pl. 26, Fig. 12:
Remarks:
This specimen bears some resemblance to Clathroctenocystis asapha (Drugg 1978) Stover and Helby 1987 which, however, has been recorded only from the Late Callovian to earliest Kimmeridgian of Britain (Riding and Thomas, 1992). The specimen recorded in this study is from the late Early Volgian of Poland (Antoninow-Skorkowka borehole).