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Dapsilidinium pseudocolligerum
Dapsilidinium pseudocolligerum (Stover, 1977) Bujak et al., 1980
Originally Polysphaeridium, subsequently (and now) Dapsilidinium.
Taxonomic senior synoym: Polysphaeridium (now Dapsilidinium) pastielsii according to Mertens et al. (2014, p.532) — however, Fensome et al., in press retained Dapsilidinium pseudocolligerum as a separate species.
Holotype: Stover, 1977, pl.1, fig.14-16
Paratype: Stover, 1977
Locus typicus: Corehole 5/5B, Blake Plateau, Western N Atlantic
Stratum typicum: Middle Oligocene
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dapsilidinium pseudocolligerum (Stover, 1977) Bujak et al., 1980, has a subspherical to spherical body from which arise about 40 or more nontabular processes. Endophragm is typically thicker than the periphragm, and the wall layers are appressed between processes. Processes nearly uniform in size and shape, hollow, generally slightly wider proximally than near their tips, more or less circular in cross-section and expanded and open distally. Surface of processes is smooth, faintly granular or striate, and area between processes granular or punctoreticulate. Can have alignment of equatorial processes. This species differs from D. pastielsii in having longer, narrower and more widely separated processes. Size: overall 60-92 µm, body 36-45 µm, processes 15-23 µm long and 3-7 µm at base.
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Original description: Stover, 1977, p. 75: Polysphaeridium pseudocolligerum
Description: Cysts are chorate with a spherical to subspherical body from which arise 40 or more nontabular processes. Endophragm is typically thicker than the periphragm, and the wall layers are appressed between processes. Processes are nearly uniform in size and shape, hollow, generally slightly wider proximally than near their tips, more or less circular in cross-section, and expanded and open distally. Surface of processes is smooth, faintly granular or striate, and areas between processes are granular or punctoreticulate. Archeopyle is apical, type A, principal archeopyle suture only slightly angular and accessory sutures are rarely developed. Operculum is free and constituent apical paraplates are not delineated on its surface. Except for the archeopyle, indicators of paratabulation and parasulcus are lacking; paracingulum not expressed or indicated by equatorial alignment of processes. Overall size 60-92 µm; body 36-45 µm in diameter; processes 15-23 µm in length and 3-7 µm in basal diameter.
Affinities:
Stover, 1977, p. 75: Polysphaeridium pseudocolligerum
Specimens of Polysphaeridium pseudocolligerum are nearly identical to those of Diphyes colligerum (Deflandre & Cookson) Cookson 1965, but differ in that D. colligerum has an enlarged, single antapical process that P. pseudocolligerum lacks. The new species differs from P. pastielsii Davey & Williams in Davey et al. 1966 by having longer, narrower and more widely separated processes.
Originally Polysphaeridium, subsequently (and now) Dapsilidinium.
Taxonomic senior synoym: Polysphaeridium (now Dapsilidinium) pastielsii according to Mertens et al. (2014, p.532) — however, Fensome et al., in press retained Dapsilidinium pseudocolligerum as a separate species.
Holotype: Stover, 1977, pl.1, fig.14-16
Paratype: Stover, 1977
Locus typicus: Corehole 5/5B, Blake Plateau, Western N Atlantic
Stratum typicum: Middle Oligocene
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Dapsilidinium pseudocolligerum (Stover, 1977) Bujak et al., 1980, has a subspherical to spherical body from which arise about 40 or more nontabular processes. Endophragm is typically thicker than the periphragm, and the wall layers are appressed between processes. Processes nearly uniform in size and shape, hollow, generally slightly wider proximally than near their tips, more or less circular in cross-section and expanded and open distally. Surface of processes is smooth, faintly granular or striate, and area between processes granular or punctoreticulate. Can have alignment of equatorial processes. This species differs from D. pastielsii in having longer, narrower and more widely separated processes. Size: overall 60-92 µm, body 36-45 µm, processes 15-23 µm long and 3-7 µm at base.
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Original description: Stover, 1977, p. 75: Polysphaeridium pseudocolligerum
Description: Cysts are chorate with a spherical to subspherical body from which arise 40 or more nontabular processes. Endophragm is typically thicker than the periphragm, and the wall layers are appressed between processes. Processes are nearly uniform in size and shape, hollow, generally slightly wider proximally than near their tips, more or less circular in cross-section, and expanded and open distally. Surface of processes is smooth, faintly granular or striate, and areas between processes are granular or punctoreticulate. Archeopyle is apical, type A, principal archeopyle suture only slightly angular and accessory sutures are rarely developed. Operculum is free and constituent apical paraplates are not delineated on its surface. Except for the archeopyle, indicators of paratabulation and parasulcus are lacking; paracingulum not expressed or indicated by equatorial alignment of processes. Overall size 60-92 µm; body 36-45 µm in diameter; processes 15-23 µm in length and 3-7 µm in basal diameter.
Affinities:
Stover, 1977, p. 75: Polysphaeridium pseudocolligerum
Specimens of Polysphaeridium pseudocolligerum are nearly identical to those of Diphyes colligerum (Deflandre & Cookson) Cookson 1965, but differ in that D. colligerum has an enlarged, single antapical process that P. pseudocolligerum lacks. The new species differs from P. pastielsii Davey & Williams in Davey et al. 1966 by having longer, narrower and more widely separated processes.