Back
Ellipsoidictyum punctatum
From Fensome et al., 2019:
Ellipsoidictyum punctatum (Jain, 1977b, p.186–187, pl.4, figs.51–52) Below, 1981a, p.47. Holotype: Jain, 1977b, pl.4, fig.51. Originally Dictyopyxidia, subsequently (and now) Ellipsoidictyum. Age: early Albian.
---------------------------------------------------------------------------------------------------
Original description: [Jain, 1977b]:
Dictyopyxidia punctata sp. nov.
PI. 4, figs. 51-52
Holotype - PI. 4, fig. 51; Slide no. 5050-2.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram Formation; Early Albian.
Diagnosis - Cyst spherical, double layered, periphragm reticulate, muri low, punctate, luminae irregular, polygonal. Cingulum present. Archaeopyle apical, margin angular.
Measurements Holotype Range
Cyst diameter 66 μm 55-70 μm
Comparison - The absence of sulcus and the presence of cingulum precludes its placement under Ellipsoidictyum Klement (1960) and Cassiculosphaerida Davey (1966). D. punctata sp. novo differs from D. areolata Cookson & Eisenack (1960), D. circulata Clarke & Verdier (1967) and D. reticulata (Valensi) Lentin & Williams (1973) in having punctate muri.
Remarks - Dictyopyxidia has a common representation in the present dinoflagellate assemblage. Some specimens do not clearly show the presence of a cingulum which suggests their placement under the genus Cassiculosphaeridia Davey. The choice of the genus therefore becomes arbitrary and needs careful observation.
Ellipsoidictyum punctatum (Jain, 1977b, p.186–187, pl.4, figs.51–52) Below, 1981a, p.47. Holotype: Jain, 1977b, pl.4, fig.51. Originally Dictyopyxidia, subsequently (and now) Ellipsoidictyum. Age: early Albian.
---------------------------------------------------------------------------------------------------
Original description: [Jain, 1977b]:
Dictyopyxidia punctata sp. nov.
PI. 4, figs. 51-52
Holotype - PI. 4, fig. 51; Slide no. 5050-2.
Locality - Kallakkudi Limestone Quarry II, Dalmiapuram, South India.
Horizon - Grey Shale Member, Dalmiapuram Formation; Early Albian.
Diagnosis - Cyst spherical, double layered, periphragm reticulate, muri low, punctate, luminae irregular, polygonal. Cingulum present. Archaeopyle apical, margin angular.
Measurements Holotype Range
Cyst diameter 66 μm 55-70 μm
Comparison - The absence of sulcus and the presence of cingulum precludes its placement under Ellipsoidictyum Klement (1960) and Cassiculosphaerida Davey (1966). D. punctata sp. novo differs from D. areolata Cookson & Eisenack (1960), D. circulata Clarke & Verdier (1967) and D. reticulata (Valensi) Lentin & Williams (1973) in having punctate muri.
Remarks - Dictyopyxidia has a common representation in the present dinoflagellate assemblage. Some specimens do not clearly show the presence of a cingulum which suggests their placement under the genus Cassiculosphaeridia Davey. The choice of the genus therefore becomes arbitrary and needs careful observation.