Back
Stephodinium spinulosum
Stephodinium spinulosum Duxbury, 1983
Holotype: Duxbury 1983, pl.5, fig.6
Locus typicus: Redcliff section, Isle of Wight, England
Stratum typicum: Late Aptian-early Albian
Original diagnosis: Duxbury, 1983, p. 57-58
A fairly thick-walled, distinctly bi-layered, proximo-cavate dinoflagellate cyst species with smooth endo- and periphragm. The body layers are appressed except in an area including the paracingulum and those portions of the pre- and postcingular series adjacent to it. Paratabulation of the formula 3", ?6", ?6c, 5""", 1p. v., 1"""" is outlined by low parasutural crests. Gonal areas bear short, trifurcate processes and, rarely, bifurcate parasutural ones may be present. The archeopyle is single-paraplate precingular (3").
Observed Dimensions: Holotype - 52 x 70 µm. Overall - 67 (61) 49 x 84 (75) 61 µm
Affinities:
Duxbury, 1983, p. 58: The presence of short, Spiniferites-type processes distinguishes this species from Stephodinium coronatum Deflandre, 1936, the most closely comparable taxon.
Holotype: Duxbury 1983, pl.5, fig.6
Locus typicus: Redcliff section, Isle of Wight, England
Stratum typicum: Late Aptian-early Albian
Original diagnosis: Duxbury, 1983, p. 57-58
A fairly thick-walled, distinctly bi-layered, proximo-cavate dinoflagellate cyst species with smooth endo- and periphragm. The body layers are appressed except in an area including the paracingulum and those portions of the pre- and postcingular series adjacent to it. Paratabulation of the formula 3", ?6", ?6c, 5""", 1p. v., 1"""" is outlined by low parasutural crests. Gonal areas bear short, trifurcate processes and, rarely, bifurcate parasutural ones may be present. The archeopyle is single-paraplate precingular (3").
Observed Dimensions: Holotype - 52 x 70 µm. Overall - 67 (61) 49 x 84 (75) 61 µm
Affinities:
Duxbury, 1983, p. 58: The presence of short, Spiniferites-type processes distinguishes this species from Stephodinium coronatum Deflandre, 1936, the most closely comparable taxon.