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Mendicodinium umbriense
From Fensome et al., 2019:
Mendicodinium umbriense Bucefalo Palliani et al., 1997a, p.103, pl.2, figs.5–9; pl.3, figs.4,6; text-fig.2. Holotype: Bucefalo Palliani et al., 1997a, pl.2, fig.7. Age: early Toarcian.
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Type locality: Colle d"Orlando section, Marne di Monte Serrone Formation, central Italy.
Stratigraphic horizon: Lower Toarcian, lower D. tenuicostatum Zone
Original diagnosis: Bucefalo Palliani et al. 1997a, p. 103
Ellipsoidal, proximate, small dinoflagellate cysts. Autophragm smooth, scabrate to micro-granulate with nontabular granules.
Original description: Bucefalo Palliani et al. 1997a, p. 103
Ellipsoidal, proximate, small dinoflagellate cysts which are markedly elongate equatorially. Autophragm smooth, scabrate to microgranulate; a highly variable, sparse to dense covering of granules is developed. The granules are about 1Ám in diameter and have a nontabular distribution. The cyst is characterized by very
dense internal sculpture (Plate III,4). The hypocyst may be significantly larger than the epicyst.
Dimensions:
Holotype: Length 28 µm, width 36 µm
Overall cyst length: minimum 26 µm; mean 28.5 µm; maximum 34 µm. Overall cyst width: minimum 31 µm;
mean 30.25 µm; maximum 37 µm (15 specimens measured).
Discussion: Bucefalo Palliani et al. 1997a, p. 103
Mendicodinium granulatum Kumar, 1986 is significantly larger in overall size, the maximum diameter of this taxon varies between 78 and 89 ,um. Mendicodinium morgenrothum Butler, 1995 is distinguished from M. umbriense by its markedly greater size and for its ornamentation by nontabular verrucae. Mendicodinium umbriense differs from all other species of Mendicodinium by its distinctive, nontabular granulate ornamentation of variable density. In certain specimens, the granules are extremely sparse (e.g., Plate II, 7-9),
whereas on others, the covering is relatively dense (Plate II, 5, 6). Mendicodinium sp. 3 in Baldanza et al. (1995) is considered to be M. umbriense.
Mendicodinium umbriense Bucefalo Palliani et al., 1997a, p.103, pl.2, figs.5–9; pl.3, figs.4,6; text-fig.2. Holotype: Bucefalo Palliani et al., 1997a, pl.2, fig.7. Age: early Toarcian.
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Type locality: Colle d"Orlando section, Marne di Monte Serrone Formation, central Italy.
Stratigraphic horizon: Lower Toarcian, lower D. tenuicostatum Zone
Original diagnosis: Bucefalo Palliani et al. 1997a, p. 103
Ellipsoidal, proximate, small dinoflagellate cysts. Autophragm smooth, scabrate to micro-granulate with nontabular granules.
Original description: Bucefalo Palliani et al. 1997a, p. 103
Ellipsoidal, proximate, small dinoflagellate cysts which are markedly elongate equatorially. Autophragm smooth, scabrate to microgranulate; a highly variable, sparse to dense covering of granules is developed. The granules are about 1Ám in diameter and have a nontabular distribution. The cyst is characterized by very
dense internal sculpture (Plate III,4). The hypocyst may be significantly larger than the epicyst.
Dimensions:
Holotype: Length 28 µm, width 36 µm
Overall cyst length: minimum 26 µm; mean 28.5 µm; maximum 34 µm. Overall cyst width: minimum 31 µm;
mean 30.25 µm; maximum 37 µm (15 specimens measured).
Discussion: Bucefalo Palliani et al. 1997a, p. 103
Mendicodinium granulatum Kumar, 1986 is significantly larger in overall size, the maximum diameter of this taxon varies between 78 and 89 ,um. Mendicodinium morgenrothum Butler, 1995 is distinguished from M. umbriense by its markedly greater size and for its ornamentation by nontabular verrucae. Mendicodinium umbriense differs from all other species of Mendicodinium by its distinctive, nontabular granulate ornamentation of variable density. In certain specimens, the granules are extremely sparse (e.g., Plate II, 7-9),
whereas on others, the covering is relatively dense (Plate II, 5, 6). Mendicodinium sp. 3 in Baldanza et al. (1995) is considered to be M. umbriense.