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Tehamadinium crestatum
Tehamadinium crestatum (Jain, 1977) Jan du Chêne et al. in Jan du Chêne et al., 1986a; emend. Jan du Chêne et al., 1986b
Originally Occisucysta, subsequently (and now) Tehamadinium.
Holotype: Jain, 1977, pl.5, figs.63-65; Jan du Chêne et al., 1986a, pl.118, fig.11; Jan du Chêne et al., 1986b, pl.26, fig.4
Age: Early Albian
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Original description: [Jain, 1977b]:
Occisucysta crestata sp. nov.
PI. 5, figs. 63-65
Holotype - PI. 5, figs. 63-65; Slide no. 5071-3.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram Formation; Early Albian.
Diagnosis - Cyst subspherical, sutural crest well-developed, made up of uniform processes, distally bifid and connected forming regular elevation, distal connection giving rise to lateral pseudoperforations; margin irregular to dentate. Apical horn not seen except high apical crest. Periphragm vermiculate. Tabulation that of the genus but not seen in holotype. Cingulum laevo-rotatory, sulcus distinct, only slightly extends towards epitract. Archaeopyle precingular (2"+3").
Measurement Holotype Range
Cyst diameter 78 μm 60-80 μm
Central body diameter 65 μm 60-70 μm
Crest height 6 μm 3-6 μm
Apical Crest height 12 μm 6-12 μm
Comparison - P. crestata sp. novo differs from the known species of the genus in having irregularly perforate sutural crest with vermiculate periphragm.
Remarks - Genus Occisucysta is characterized by its strong apical horn, but the present forms lack this feature. Presence or absence of an apical horn in this genus seems to be variable.
Originally Occisucysta, subsequently (and now) Tehamadinium.
Holotype: Jain, 1977, pl.5, figs.63-65; Jan du Chêne et al., 1986a, pl.118, fig.11; Jan du Chêne et al., 1986b, pl.26, fig.4
Age: Early Albian
------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Jain, 1977b]:
Occisucysta crestata sp. nov.
PI. 5, figs. 63-65
Holotype - PI. 5, figs. 63-65; Slide no. 5071-3.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram Formation; Early Albian.
Diagnosis - Cyst subspherical, sutural crest well-developed, made up of uniform processes, distally bifid and connected forming regular elevation, distal connection giving rise to lateral pseudoperforations; margin irregular to dentate. Apical horn not seen except high apical crest. Periphragm vermiculate. Tabulation that of the genus but not seen in holotype. Cingulum laevo-rotatory, sulcus distinct, only slightly extends towards epitract. Archaeopyle precingular (2"+3").
Measurement Holotype Range
Cyst diameter 78 μm 60-80 μm
Central body diameter 65 μm 60-70 μm
Crest height 6 μm 3-6 μm
Apical Crest height 12 μm 6-12 μm
Comparison - P. crestata sp. novo differs from the known species of the genus in having irregularly perforate sutural crest with vermiculate periphragm.
Remarks - Genus Occisucysta is characterized by its strong apical horn, but the present forms lack this feature. Presence or absence of an apical horn in this genus seems to be variable.