Back
Laciniadinium orbiculatum
Laciniadinium orbiculatum McIntyre, 1975
Holotypus: McIntyre, 1975, pl.4, fig.12-13
Locus typicus: Horton River, N.W.T., Canada
Stratum typicum: Campanian
Original diagnosis: McIntyre, 1975, p.70
Cyst proximate, oval to spherical in dorsoventral vlew and dorsoventrally flattened. Apical projection 2-4 Ám long, having a depressed apex with 2 papillae. No antapical horns visible. Cyst often folded or broken. Epitract often slightly larger than hypotract. Cingulum 3-5 Ám wide, appearing as low granular to spiny ridges or rows of granules or spines. Sulcus wide but rarely seen. The archeopyle is large and formed of the 3 intercalary and the precingular reflected plates 3", 4" and 5" and is of the type 3I3P. Operculum simple, remains attached at cingulum margin (Pl. 4, fig. 10, 11), and often seen as a folded flap (Pl. 4, fig. 11). The operculum is often in Place and the archeopyle position is indicated by the outline of the 6 reflected plates and there is no separation along the sutures (Pl. 4, fig. 12, 13). No other visible indications of tabulation. Cyst ornamented by granules and small spines up to 1 Ám long. No ornament pattern evident. Only 1 wall layer, less than 1 Ám thick, is visible except at the apex where a separation into 2 very thin layers can be seen. A few small folds can sometimes be seen near the apex.
Dimensions: Holotype, 87 Ám long, 78 Ám wide; range, 70-110 Ám long, 70-97 Ám wide.
Holotypus: McIntyre, 1975, pl.4, fig.12-13
Locus typicus: Horton River, N.W.T., Canada
Stratum typicum: Campanian
Original diagnosis: McIntyre, 1975, p.70
Cyst proximate, oval to spherical in dorsoventral vlew and dorsoventrally flattened. Apical projection 2-4 Ám long, having a depressed apex with 2 papillae. No antapical horns visible. Cyst often folded or broken. Epitract often slightly larger than hypotract. Cingulum 3-5 Ám wide, appearing as low granular to spiny ridges or rows of granules or spines. Sulcus wide but rarely seen. The archeopyle is large and formed of the 3 intercalary and the precingular reflected plates 3", 4" and 5" and is of the type 3I3P. Operculum simple, remains attached at cingulum margin (Pl. 4, fig. 10, 11), and often seen as a folded flap (Pl. 4, fig. 11). The operculum is often in Place and the archeopyle position is indicated by the outline of the 6 reflected plates and there is no separation along the sutures (Pl. 4, fig. 12, 13). No other visible indications of tabulation. Cyst ornamented by granules and small spines up to 1 Ám long. No ornament pattern evident. Only 1 wall layer, less than 1 Ám thick, is visible except at the apex where a separation into 2 very thin layers can be seen. A few small folds can sometimes be seen near the apex.
Dimensions: Holotype, 87 Ám long, 78 Ám wide; range, 70-110 Ám long, 70-97 Ám wide.