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Dapsilidinium hystrichosum
Dapsilidinium hystrichosum Islam, 1983
Holotype: Islam, 1983, pl.1, fig.4
Paratype: Islam, 1983
Locus typicus: Isle of Sheppey, SE England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1983, p.235-236
The cyst is subsphaerical, skolochorate, and biphragmal; endophragm reticulate, periphragm mildly chagrinate; possesses many generally nontabulur columnar to tubular processes some of which may slightly taper outwardly, may very little in length and breadth in the same specimen, proximally closed and little wide, distally open and hear short thorny spines from above mid-Iength to distal extremity; archeopyle is apical type tA.
Dimensions: Holotype: cyst body 37 X 38 Ám, length of process, 15-18 Ám. Range: cyst length 42(35)31 Ám, breadth 42(35)31 Ám; length of processcs 9-20 Ám. Specimens measured 12.
Affinities:
Islam, 1983, p.236: It differs from other species of the genus in its process morphology, particularly from D. stelacus, to which it closely resembles, in possessing thorny spines. Grouping of processes in some forms indicated a possible paratahulation of ?1-3", 6", 6c, 5-6""", 1p, 1"""", and thus their intratabular distribution. The matter remains subject to further observations and confirmation.
Heilmann-Clausen in Heilmann-Clausen and Costa, 1989, p.464, pl.14, fig.10
Dapsilidinium hystrichosum resembles Hystrichosphaeridium cylindratum, but is distinguished on the number of processes. In D. hystrichosum the number of processes seems to be more than 40. The number of processes in H. cylindratum is between 20 and 30.
Holotype: Islam, 1983, pl.1, fig.4
Paratype: Islam, 1983
Locus typicus: Isle of Sheppey, SE England
Stratum typicum: Early Eocene
Original diagnosis: Islam, 1983, p.235-236
The cyst is subsphaerical, skolochorate, and biphragmal; endophragm reticulate, periphragm mildly chagrinate; possesses many generally nontabulur columnar to tubular processes some of which may slightly taper outwardly, may very little in length and breadth in the same specimen, proximally closed and little wide, distally open and hear short thorny spines from above mid-Iength to distal extremity; archeopyle is apical type tA.
Dimensions: Holotype: cyst body 37 X 38 Ám, length of process, 15-18 Ám. Range: cyst length 42(35)31 Ám, breadth 42(35)31 Ám; length of processcs 9-20 Ám. Specimens measured 12.
Affinities:
Islam, 1983, p.236: It differs from other species of the genus in its process morphology, particularly from D. stelacus, to which it closely resembles, in possessing thorny spines. Grouping of processes in some forms indicated a possible paratahulation of ?1-3", 6", 6c, 5-6""", 1p, 1"""", and thus their intratabular distribution. The matter remains subject to further observations and confirmation.
Heilmann-Clausen in Heilmann-Clausen and Costa, 1989, p.464, pl.14, fig.10
Dapsilidinium hystrichosum resembles Hystrichosphaeridium cylindratum, but is distinguished on the number of processes. In D. hystrichosum the number of processes seems to be more than 40. The number of processes in H. cylindratum is between 20 and 30.