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Occisucysta sousensis
Occisucysta sousensis Below, 1981
Now Tehamadinium. Originally Occisucysta, subsequently (and now) Tehamadinium.
Holotype: Below, 1981, pl.8, figs.1a-b; Jan du Chêne et al., 1986(a), pl.117, figs.7-10; Jan du Chêne et al., 1986(b), pl.22, figs.1-5; Fensome et al., 1991, figs.1-5 - p.743
Locus typicus: Ravine NW of Amalou, SW Morocco
Stratum typicum: Aptian (Gargasian)
Translation Below, 1981: Fensome et al., 1991, p. 744-745
Original diagnosis: Below, 1981, p. 62
Spherical, proximate cyst with a gonyaulacoid tabulation. Epicyst and hypocyst of approximately equal size, separated by a weakly helicoid paracingulum. Parasulcus subdivided. Cyst subdivided into paraplates according to the following scheme: 4", 6"", Xc, 6""", lpc, 1"""", lps. Field boundaries marked by low, arcade-like ridges. Intratabular appendages absent. Endophragm delicate and smooth, periphragm irregularly and finely reticulate. Archeopyle type 2P(2""-3"").
Original description: Below, 1981, p. 62
The cyst is usually spheroidal. Rounded pentagonal or rhomboidal forms rarely occur. Changes in outline are common and are due to the instability of the thin-walled body, which results from development of the large precingular archeopyle. I believe that the common tendency of the cyst to break along the anterior paracingular margin can be attributed to the same cause. The epicyst, with its small apical horn which occasionally may be absent, is approximately of the same size as the hypocyst. The paracingulum separating the two halves of the cyst, is equatorial and is offset at the short parasulcus by a distance equal to its own width and is thus only moderately helicoidal. There is a suggestion of individual paraplates; however, it cannot be determined due to extremely weak development of parasutural ridges. Low, perforate ridges, laterally changing irregularly into a reticulum, with smooth, undulate or occasionally weakly spiny crests follow the paraplate boundaries. In some specimens, some of these ridges have been enlarged and constitute high, perforate septa of the type known to occur in Occisucysta tenuiceras (Eisenack 1958) comb. nov. thus indicating the close relationship of the two species. The paratabuiation of both forms is also similar, even in detail so that the description of Occisucysta tenuiceras (Eisenack 1958) comb. nov. ([Below, 1981a] p.63) can be referred to. Intratabular ornamentation is usually absent. The surface consists of an even, irregularly perforated periphragm which is superimposed on a smooth endophragm. Occasional intratabular spines are only rarely developed.
Now Tehamadinium. Originally Occisucysta, subsequently (and now) Tehamadinium.
Holotype: Below, 1981, pl.8, figs.1a-b; Jan du Chêne et al., 1986(a), pl.117, figs.7-10; Jan du Chêne et al., 1986(b), pl.22, figs.1-5; Fensome et al., 1991, figs.1-5 - p.743
Locus typicus: Ravine NW of Amalou, SW Morocco
Stratum typicum: Aptian (Gargasian)
Translation Below, 1981: Fensome et al., 1991, p. 744-745
Original diagnosis: Below, 1981, p. 62
Spherical, proximate cyst with a gonyaulacoid tabulation. Epicyst and hypocyst of approximately equal size, separated by a weakly helicoid paracingulum. Parasulcus subdivided. Cyst subdivided into paraplates according to the following scheme: 4", 6"", Xc, 6""", lpc, 1"""", lps. Field boundaries marked by low, arcade-like ridges. Intratabular appendages absent. Endophragm delicate and smooth, periphragm irregularly and finely reticulate. Archeopyle type 2P(2""-3"").
Original description: Below, 1981, p. 62
The cyst is usually spheroidal. Rounded pentagonal or rhomboidal forms rarely occur. Changes in outline are common and are due to the instability of the thin-walled body, which results from development of the large precingular archeopyle. I believe that the common tendency of the cyst to break along the anterior paracingular margin can be attributed to the same cause. The epicyst, with its small apical horn which occasionally may be absent, is approximately of the same size as the hypocyst. The paracingulum separating the two halves of the cyst, is equatorial and is offset at the short parasulcus by a distance equal to its own width and is thus only moderately helicoidal. There is a suggestion of individual paraplates; however, it cannot be determined due to extremely weak development of parasutural ridges. Low, perforate ridges, laterally changing irregularly into a reticulum, with smooth, undulate or occasionally weakly spiny crests follow the paraplate boundaries. In some specimens, some of these ridges have been enlarged and constitute high, perforate septa of the type known to occur in Occisucysta tenuiceras (Eisenack 1958) comb. nov. thus indicating the close relationship of the two species. The paratabuiation of both forms is also similar, even in detail so that the description of Occisucysta tenuiceras (Eisenack 1958) comb. nov. ([Below, 1981a] p.63) can be referred to. Intratabular ornamentation is usually absent. The surface consists of an even, irregularly perforated periphragm which is superimposed on a smooth endophragm. Occasional intratabular spines are only rarely developed.