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Spongodinium reticulatum
Spongodinium reticulatum Hultberg, 1985c
Hultberg, 1985d, also published this as a new species.
Holotype: Hultberg, 1985c, pl.2, fig.3
Locus typicus: Stevens Klint, Denmark
Stratum typicum: Danian
Original description: Hultberg, 1985, p. 62-63
Proximate cyst, composed of one wall layer or two wall layers, closely appressed. The shape is polyhedral with a prominent apical horn. The wall of the cyst is marked by vacuoles of different size, giving the wall a reticulate appearance. These vacuoles are evenly distributed on the cyst wall. No trace of paratabulation is present except the archeopyle. The paracingulum is marked by a slight depression in the cyst wall. The parasulcus is marked by a conspicuous area of vacuoles, much smaller than those at other locations. The archeopyle is precingular, type P. It is formed by the detachent of paraplate 1". The operculum is free. The archeopyle is very large and may be enlarged.
Affinities:
Hultberg, 1985, p. 63: This species can easily be distinguished from all other species of Sponapdinium by its extremely vacuolate periphragm. The only other species with similar vacuoles is S. delitiense. However, S. delitiense has unevenly distributed vacuoles on a smooth periphragm.
Hultberg, 1985d, also published this as a new species.
Holotype: Hultberg, 1985c, pl.2, fig.3
Locus typicus: Stevens Klint, Denmark
Stratum typicum: Danian
Original description: Hultberg, 1985, p. 62-63
Proximate cyst, composed of one wall layer or two wall layers, closely appressed. The shape is polyhedral with a prominent apical horn. The wall of the cyst is marked by vacuoles of different size, giving the wall a reticulate appearance. These vacuoles are evenly distributed on the cyst wall. No trace of paratabulation is present except the archeopyle. The paracingulum is marked by a slight depression in the cyst wall. The parasulcus is marked by a conspicuous area of vacuoles, much smaller than those at other locations. The archeopyle is precingular, type P. It is formed by the detachent of paraplate 1". The operculum is free. The archeopyle is very large and may be enlarged.
Affinities:
Hultberg, 1985, p. 63: This species can easily be distinguished from all other species of Sponapdinium by its extremely vacuolate periphragm. The only other species with similar vacuoles is S. delitiense. However, S. delitiense has unevenly distributed vacuoles on a smooth periphragm.