Back
Microdinium fibratum
Microdinium? fibratum Batten and Lister, 1988
NOW Protoellipsodinium. Originally Microdinium, subsequently (and now) Protoellipsodinium. Batten and Lister, 1990 questionably included this species in Microdinium.
Holotype: Batten and Lister, figs.2g,h
Locus typicus: Isle of Wight, England
Stratum typicum: Barremian
Original diagnosis: Batten and Lister, 1988, p.345
Small, subspherical thin-walled (1Ám or less) cyst; maximum diameter including ornament 25(30)40x24(33)45 Ám (8 specimens); without ornament 25-35x24-26 Ám (2 specimens). Wall an autophragm, typically densely covered by short, very fine hairs of approximately uniform length (c. 5 Ám) that appear to arise from minute surface granules. These processes may occasionally, however, be undeveloped on some specimens or have been removed by degradation. Rarely, faint lines delineating an incomplete gonyaulacoid paratabulation can be discerned through hairs and on specimens that lack them. A single antapical paraplate, 5-6 postcingulars and a parasulcal furrow may be visible but epicystal paratabulation is not clearly discernible. Apical archeopyle, which is rarely developed, has a moderately angular margin.
NOW Protoellipsodinium. Originally Microdinium, subsequently (and now) Protoellipsodinium. Batten and Lister, 1990 questionably included this species in Microdinium.
Holotype: Batten and Lister, figs.2g,h
Locus typicus: Isle of Wight, England
Stratum typicum: Barremian
Original diagnosis: Batten and Lister, 1988, p.345
Small, subspherical thin-walled (1Ám or less) cyst; maximum diameter including ornament 25(30)40x24(33)45 Ám (8 specimens); without ornament 25-35x24-26 Ám (2 specimens). Wall an autophragm, typically densely covered by short, very fine hairs of approximately uniform length (c. 5 Ám) that appear to arise from minute surface granules. These processes may occasionally, however, be undeveloped on some specimens or have been removed by degradation. Rarely, faint lines delineating an incomplete gonyaulacoid paratabulation can be discerned through hairs and on specimens that lack them. A single antapical paraplate, 5-6 postcingulars and a parasulcal furrow may be visible but epicystal paratabulation is not clearly discernible. Apical archeopyle, which is rarely developed, has a moderately angular margin.