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Stephanelytron cretaceum
Stephanelytron cretaceum Duxbury, 1983, p.56, pl.7, figs.5–6.
Taxonomic senior synonym: Chlamydophorella (as Lagenadinium?, now Stephanelytron) membranoidea, according to Heilmann-Clausen in Heilmann-Clausen and Thomsen (1995, p.301) — however, Courtinat (1999, p.178) retained Stephanelytron cretaceum.
Holotype: Duxbury, 1983, pl.7, figs.5–6; Fauconnier and Masure, 2004, pl.73, figs.1–2.
Age: Aptian.
Original diagnosis: Duxbury, 1983, p. 56
A spheroidal, holocavate dinoflagellate cyst possessing a low apical protuberance. The autophragm is smooth and bears numerous short, slender, hollow tubules which flare proximally and distally. The tubules may be distally united by a continuous or fragmentary, very delicate ectophragm. A small corona is present near the antapical pole and the cyst surface within the corona is densely granular. The archeopyle is apical and no paratabulation is apparent except around the archeopyle margin. Holotype 52x49 µm. Overall 58(52)46x58(49)44 µm.
Affinities:
Duxbury, 1983, p. 56: The species to which S. cretaceum bears resemblance are Stephanelytron scarburghense Sarjeant, 1961 and Chlamydophorella huguonioti Davey, 1978. S. scarburghense differs, however, in possessing a very distinct and larger corona than S. cretaceum and, in some cases, it has two coronas. C. huguonioti differs in lacking any corona.
Taxonomic senior synonym: Chlamydophorella (as Lagenadinium?, now Stephanelytron) membranoidea, according to Heilmann-Clausen in Heilmann-Clausen and Thomsen (1995, p.301) — however, Courtinat (1999, p.178) retained Stephanelytron cretaceum.
Holotype: Duxbury, 1983, pl.7, figs.5–6; Fauconnier and Masure, 2004, pl.73, figs.1–2.
Age: Aptian.
Original diagnosis: Duxbury, 1983, p. 56
A spheroidal, holocavate dinoflagellate cyst possessing a low apical protuberance. The autophragm is smooth and bears numerous short, slender, hollow tubules which flare proximally and distally. The tubules may be distally united by a continuous or fragmentary, very delicate ectophragm. A small corona is present near the antapical pole and the cyst surface within the corona is densely granular. The archeopyle is apical and no paratabulation is apparent except around the archeopyle margin. Holotype 52x49 µm. Overall 58(52)46x58(49)44 µm.
Affinities:
Duxbury, 1983, p. 56: The species to which S. cretaceum bears resemblance are Stephanelytron scarburghense Sarjeant, 1961 and Chlamydophorella huguonioti Davey, 1978. S. scarburghense differs, however, in possessing a very distinct and larger corona than S. cretaceum and, in some cases, it has two coronas. C. huguonioti differs in lacking any corona.