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Endoscrinium indicum
Endoscrinium indicum (Jain and Garg in Jain et al., 1984, p.72-73, pl.2, figs.22-23) Riding and Fensome, 2003, p.22.
Originally Scriniodinium, subsequently (and now) Endoscrinium.
Holotype: Jain et al., 1984, pl.2, fig.22.
Age: Kimmeridgian-Early Tithonian.
(Jain & Garg, 1984)
Diagnosis: cyst circumcavate, outline variable, mostly broadly triangular, sometimes squarish to rounded, central body broadly triangular, follows shape of cyst outline, pericyst smaller than hypocyst divided by an annular paracingulum; apical and antapical horns absent; endophragm thick, periphragm thin, ornamentation on both not discernible. Archeopyle precingular (3’’), trapeziform, both periphragm and endophargm involved in its formation.
Dimensions:
Overall cyst size: 85-104x85-100 µm
Cyst body diameter: 60-66 µm
Periphragm extension beyond body margin: 8-26 µm
Comparison: Sciniodinium indicum Jain & Garg n.sp. compares best with S. attadalense (Cookson & Eisenack) Eisenack (1967) in having unequal epi- and hypo-cysts and central body following the periphragm outline, but differs in being broadly triangular and not possessing any antapical opening. S. crystallium (Deflandre) Klement (1960) differs in its equal epi- and hypo-cyst portions and rounded antapex. The involvement of periphargm and endophragm in the formation of Archeopyle distinguishes this species from others of the genus except for S. rostratum Brideaux & McIntyre (1975) which differs in the absence of “Beak-like” apex. Cookson & Eisenack (1960, p. 247) reported Scriniodinium luridum (Deflandre) Klement (1960) from Exfordian to Lower Kimmerdgian or probably Tithonian of Austalia. The figured specimen distingctly shows the involvement of both peri- and endophargm in the formation of the precingular Archeopyle as found in the present species. The other features are also similar.
Type locilty: Malla Johar area, Pithoragarh district, U.P., India.
Age: Upper Jurassic (Kimmeridgiam-Lower Tithonian)
Originally Scriniodinium, subsequently (and now) Endoscrinium.
Holotype: Jain et al., 1984, pl.2, fig.22.
Age: Kimmeridgian-Early Tithonian.
(Jain & Garg, 1984)
Diagnosis: cyst circumcavate, outline variable, mostly broadly triangular, sometimes squarish to rounded, central body broadly triangular, follows shape of cyst outline, pericyst smaller than hypocyst divided by an annular paracingulum; apical and antapical horns absent; endophragm thick, periphragm thin, ornamentation on both not discernible. Archeopyle precingular (3’’), trapeziform, both periphragm and endophargm involved in its formation.
Dimensions:
Overall cyst size: 85-104x85-100 µm
Cyst body diameter: 60-66 µm
Periphragm extension beyond body margin: 8-26 µm
Comparison: Sciniodinium indicum Jain & Garg n.sp. compares best with S. attadalense (Cookson & Eisenack) Eisenack (1967) in having unequal epi- and hypo-cysts and central body following the periphragm outline, but differs in being broadly triangular and not possessing any antapical opening. S. crystallium (Deflandre) Klement (1960) differs in its equal epi- and hypo-cyst portions and rounded antapex. The involvement of periphargm and endophragm in the formation of Archeopyle distinguishes this species from others of the genus except for S. rostratum Brideaux & McIntyre (1975) which differs in the absence of “Beak-like” apex. Cookson & Eisenack (1960, p. 247) reported Scriniodinium luridum (Deflandre) Klement (1960) from Exfordian to Lower Kimmerdgian or probably Tithonian of Austalia. The figured specimen distingctly shows the involvement of both peri- and endophargm in the formation of the precingular Archeopyle as found in the present species. The other features are also similar.
Type locilty: Malla Johar area, Pithoragarh district, U.P., India.
Age: Upper Jurassic (Kimmeridgiam-Lower Tithonian)