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Mendicodinium spinosum ssp. perforatum
Mendicodinium spinosum subsp. perforatum Bucefalo Palliani et al. 1997a
Original description (Bucefalo Palliani et al. 1997a):
Mendicodinium spinosum subsp, perforatum Bucefalo Palliani, Riding et Torricelli, sp. nov. (Plate I, 1-5; Plate Ill, 1, 2, 7)
Holotype: Slide PO 3.00 (3). "England Finder" coordinate L 39-4 (Plate I, 1, 2). Sample of the section. Marne di Monte Serrone Formation, lower Toarcian. Length 28 µm, width 30.4 µm, spines 4 µm.
Repository: Earth Sciences Department, Perugia University, Italy.
Type locality: Pozzale section, sample PO 3.00, 3.00 m from the base, Marne di Monte Serrone Formation, central Italy.
Stratigraphic horizon: Lower Toarcian, lower D. tenuicostatum Zone.
Etymology: From the characteristic perforate autophragm.
Diagnosis: A subspecies of Mendicodinium spinosum Bucefalo Palliani, Riding et Torricelli, sp. nov. which has perforate autophragm and spines.
Description: Ellipsoidal, proximochorate, small dinoflagellate cysts which are markedly elongate equatorially. Autophragm relatively thick and perforate, surmounted by nontabular, solid, distally tapering spines. The hypocyst may be significantly larger than the epicyst.
Dimensions: Overall cyst length: minimum 19 µm; mean 21.4 µm; maximum 27 µm. Overall cyst width: minimum 20 µm; mean 25.5 µm; maximum 33 µm. Length of spines: minimum 3 µm; mean 3.2 µm; maximum 4 µm (18 specimens measured).
Discussion: This subspecies is distinguished from Mendicodinium spinosum subsp, spinosum in having perforate autophragm and spines.
Original description (Bucefalo Palliani et al. 1997a):
Mendicodinium spinosum subsp, perforatum Bucefalo Palliani, Riding et Torricelli, sp. nov. (Plate I, 1-5; Plate Ill, 1, 2, 7)
Holotype: Slide PO 3.00 (3). "England Finder" coordinate L 39-4 (Plate I, 1, 2). Sample of the section. Marne di Monte Serrone Formation, lower Toarcian. Length 28 µm, width 30.4 µm, spines 4 µm.
Repository: Earth Sciences Department, Perugia University, Italy.
Type locality: Pozzale section, sample PO 3.00, 3.00 m from the base, Marne di Monte Serrone Formation, central Italy.
Stratigraphic horizon: Lower Toarcian, lower D. tenuicostatum Zone.
Etymology: From the characteristic perforate autophragm.
Diagnosis: A subspecies of Mendicodinium spinosum Bucefalo Palliani, Riding et Torricelli, sp. nov. which has perforate autophragm and spines.
Description: Ellipsoidal, proximochorate, small dinoflagellate cysts which are markedly elongate equatorially. Autophragm relatively thick and perforate, surmounted by nontabular, solid, distally tapering spines. The hypocyst may be significantly larger than the epicyst.
Dimensions: Overall cyst length: minimum 19 µm; mean 21.4 µm; maximum 27 µm. Overall cyst width: minimum 20 µm; mean 25.5 µm; maximum 33 µm. Length of spines: minimum 3 µm; mean 3.2 µm; maximum 4 µm (18 specimens measured).
Discussion: This subspecies is distinguished from Mendicodinium spinosum subsp, spinosum in having perforate autophragm and spines.