Back
Palynodinium spongiosum
Palynodinium spongiosum Hultberg, 1985c, p.139–140, pl.8, figs.H–J.
Holotype: Hultberg, 1985c, pl.8, figs.H–J.
Age: late Maastrichtian.
Original description Hultberg, 1985, p. 140
Chorate cyst, composed of endophragm and periphragm, closely appressed, except in the ventroapical part of the cyst. The surface of the endophragm is smooth. The surface of the periphragm is strongly spongious. The shape of the cyst is subspherical with two symmetrical ventroantapical protrusions, formed by the periphragm. Paratabulation is discernible by gonal and intergonal processes. Two types of processes are present. The first type is long and slender. The proximal end is conical, sometimes with a conical cavity. The process-tips are capitate. The second type is bifurcate, and in some cases trifurcate, with capitate furcae. The paratabulation is gonyaulacacean, paratabulation formula: 4", 6", xc, 5-6""", 1"""". The hypocystal paratabulation is not completely discernible. The cyst probably has six postcingular paraplates, but paraplate 1""" may be too small to be identifiable, or may be integrated in the parasulcus. Also, paraplate 1p is probably present, but not discernible. The archeopyle is apical, type tA. Operculum free. Paracingulum is indicated by the absence of processes, and a depression in the periphragm. The paracingulum is almost circular. Parasulcus is discernible by the absence of processes, and a wide depression on the midventral surface.
Size - 74-79 µm (diameter).
Hultberg, 1985, p. 140: Palynodinium spongiosum is distinguished from P. grallator by the strongly spongious periphragm surface. Also, the ventroantapical protrusions of P. grallator are considerably larger than in P. spongiosum.
Holotype: Hultberg, 1985c, pl.8, figs.H–J.
Age: late Maastrichtian.
Original description Hultberg, 1985, p. 140
Chorate cyst, composed of endophragm and periphragm, closely appressed, except in the ventroapical part of the cyst. The surface of the endophragm is smooth. The surface of the periphragm is strongly spongious. The shape of the cyst is subspherical with two symmetrical ventroantapical protrusions, formed by the periphragm. Paratabulation is discernible by gonal and intergonal processes. Two types of processes are present. The first type is long and slender. The proximal end is conical, sometimes with a conical cavity. The process-tips are capitate. The second type is bifurcate, and in some cases trifurcate, with capitate furcae. The paratabulation is gonyaulacacean, paratabulation formula: 4", 6", xc, 5-6""", 1"""". The hypocystal paratabulation is not completely discernible. The cyst probably has six postcingular paraplates, but paraplate 1""" may be too small to be identifiable, or may be integrated in the parasulcus. Also, paraplate 1p is probably present, but not discernible. The archeopyle is apical, type tA. Operculum free. Paracingulum is indicated by the absence of processes, and a depression in the periphragm. The paracingulum is almost circular. Parasulcus is discernible by the absence of processes, and a wide depression on the midventral surface.
Size - 74-79 µm (diameter).
Hultberg, 1985, p. 140: Palynodinium spongiosum is distinguished from P. grallator by the strongly spongious periphragm surface. Also, the ventroantapical protrusions of P. grallator are considerably larger than in P. spongiosum.