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Operculodinium exquisitum
Operculodinium exquisitum Islam, 1983
Holotype: Islam, 1983, pl.4, fig.8
Locus typicus: Hampshire Basin, S England
Stratum typicum: Middle Eocene
Original diagnosis: Islam, 1983, p. 341
Cyst subspherical, sometimes broader than long, proximochorate to skolochorate; endophragm reticulate; periphragm reticulate!fibroreticulate; numerous nontabular fibrous processes generally solid but sometimes partly proximally hollow while distally closed or open, broader at bases, tapering to thin necks just below distal aculeation; paracingulum sometimes indicated by rows of processes; archeopyle precingular type P.
Dimensions Holotype: cyst body 68 x 73 Ám, length of processes 12-17 Ám. Range: cyst length 78(61)46 Ám, breadth 83(61)36 Ám, length of processes 7-22 Ám. Specimens measured: 10.
Affinities:
Islam, 1941, p. 341: This species differs from Operculodinium microtriaina (Klumpp) Islam 1983, O. uncinispinosum (De Coninck) Islam and O. centrocarpum in possessing wholly fibrous and partly hollow processes. It resembles O. nitidum Islam 1983 most closely but differs in being much larger, lacking proximal process connections and possessing partly hollow processes;itis also stratigraphically younger.
Holotype: Islam, 1983, pl.4, fig.8
Locus typicus: Hampshire Basin, S England
Stratum typicum: Middle Eocene
Original diagnosis: Islam, 1983, p. 341
Cyst subspherical, sometimes broader than long, proximochorate to skolochorate; endophragm reticulate; periphragm reticulate!fibroreticulate; numerous nontabular fibrous processes generally solid but sometimes partly proximally hollow while distally closed or open, broader at bases, tapering to thin necks just below distal aculeation; paracingulum sometimes indicated by rows of processes; archeopyle precingular type P.
Dimensions Holotype: cyst body 68 x 73 Ám, length of processes 12-17 Ám. Range: cyst length 78(61)46 Ám, breadth 83(61)36 Ám, length of processes 7-22 Ám. Specimens measured: 10.
Affinities:
Islam, 1941, p. 341: This species differs from Operculodinium microtriaina (Klumpp) Islam 1983, O. uncinispinosum (De Coninck) Islam and O. centrocarpum in possessing wholly fibrous and partly hollow processes. It resembles O. nitidum Islam 1983 most closely but differs in being much larger, lacking proximal process connections and possessing partly hollow processes;itis also stratigraphically younger.