Back
Chytroeisphaeridia caddaensis
Chyroeisphaeridia caddaensis, Filatoff, 1975
Holotype: Filatoff, 1975, pl.29, fig.7
Age: Bajocian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Revised description:
Stover and Helby, 1987, p. 107:
Description:
Cysts proximate, subspherical, and with a small antapical bulge or nipple-like protrusion up to 12 µm long and 14 µm wide.
Autophragm thin (1 µm or less exclusive of ornamentation), uniformly shagreenate, scabrate to granulate or with ornamentation unevenly distributed and interspersed with poorly delimited smooth areas. Sculptural elements low (1 µm or less), generally separated from each other, circular to rectangular or irregular in outline and from 0.5-4 µm in greatest planar dimension.
Compound archeopyle formed by release of 3-5 precingular paraplates and the apical series remaining attached to the hypocyst by a relatively wide isthmus consisting of paraplate 6"" and the parasulcal tongue. Paraplates 1" through 5"" are usually freed during archeopyle formation, however, paraplates 1" and/or 5"" may be adherent. Constituent paraplates of the apical cap not differentiated, but its outline suggests 4 paraplates.
Paracingulum generally not expressed, although on rare specimens with unevenly distributed ornamentation it may be indicated by a narrow, ornamented band (5-8 µm wide) immediately posterior to the archeopyle margin.
Parasulcus not delimited.
Dimensions:
Specimens 95 (124) 150 µm at about mid-length, 25 specimens measured.
Remarks:
The holotype (Filatoff, 1975, pl.29, fig.7) has lost all epicystal paraplates with the exception of paraplate 6 " which is attached to the elongate parasulcal tongue. A detached precingular paraplate can be seen within the hypocyst. We could not locate the paratype (Filatoff, 1975, pl.29, fig.8).
Affinities:
Dissiliodinium caddaense differs from D. globulum Drugg 1978 in being larger (averaging approximately twice the size) and in having a persistent antapical bulge or projection.
Holotype: Filatoff, 1975, pl.29, fig.7
Age: Bajocian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Revised description:
Stover and Helby, 1987, p. 107:
Description:
Cysts proximate, subspherical, and with a small antapical bulge or nipple-like protrusion up to 12 µm long and 14 µm wide.
Autophragm thin (1 µm or less exclusive of ornamentation), uniformly shagreenate, scabrate to granulate or with ornamentation unevenly distributed and interspersed with poorly delimited smooth areas. Sculptural elements low (1 µm or less), generally separated from each other, circular to rectangular or irregular in outline and from 0.5-4 µm in greatest planar dimension.
Compound archeopyle formed by release of 3-5 precingular paraplates and the apical series remaining attached to the hypocyst by a relatively wide isthmus consisting of paraplate 6"" and the parasulcal tongue. Paraplates 1" through 5"" are usually freed during archeopyle formation, however, paraplates 1" and/or 5"" may be adherent. Constituent paraplates of the apical cap not differentiated, but its outline suggests 4 paraplates.
Paracingulum generally not expressed, although on rare specimens with unevenly distributed ornamentation it may be indicated by a narrow, ornamented band (5-8 µm wide) immediately posterior to the archeopyle margin.
Parasulcus not delimited.
Dimensions:
Specimens 95 (124) 150 µm at about mid-length, 25 specimens measured.
Remarks:
The holotype (Filatoff, 1975, pl.29, fig.7) has lost all epicystal paraplates with the exception of paraplate 6 " which is attached to the elongate parasulcal tongue. A detached precingular paraplate can be seen within the hypocyst. We could not locate the paratype (Filatoff, 1975, pl.29, fig.8).
Affinities:
Dissiliodinium caddaense differs from D. globulum Drugg 1978 in being larger (averaging approximately twice the size) and in having a persistent antapical bulge or projection.