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Enneadocysta deconinckii
Enneadocysta deconinckii Stover and Williams, 1995
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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.
Enneadocysta deconinckii Stover and Williams, 1995, has 20 intratabular processes, 11 on the epicyst and 9 on the hypocyst. There are no cingular processes, but there is an anterior sulcal. Some process stems are branched at midlength and some may have two distinct, distally joined stems. Most process terminations are licrate. Processes on 2" to 5" with relatively wide or branched stems. Process formula: ?4', 6", 0c, 6"’, 2"”, 1as, 1ps. Size: Body diameter 47-56 µm, overall 85-110 µm, process length 20-28 µm, width at midheight 2-12 µm, width of tips 10-35 µm.
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Stover and Williams, 1995, p. 110
Enneadocysta deconinckii Stover and Williams sp. nov. Plate 2, figures 3a-f; plate 3, figures 1a-c; text-figure 1, nos. D, F
Description:
Shape: Cysts skolochorate with subspherical to nearly subspherical central body.
Wall relationships: Autophragm only.
Wall features: Autophragm finely granulate or pitted and bearing 20 intratabular processes, 11 on epicyst, nine on hypocyst. Paracingular processes absent but a single anterior parasulcal process is consistently present. Process stems solid, generally smooth but may be faintly fibroid, expanded slightly proximally, more so distally; some process stems branched at about midlength and some processes may have two distinct, distally joined stems. Most process terminations licrate, less commonly branched, and with flared part of distal structures solid or minutely fenestrate. Licrate tips shallowly arcuate to semicircular or horseshoe-shaped, with smooth inner margins and finely denticulate or spinulate outer margins.
Processes on paraplates 2'' to 5'' with relatively wide or branched stems and licrate tips with ends of arcuations directed equatorially.
Ventral processes 1'', 6'', and anterior sulcal typically narrower than those on dorsal and lateral surfaces and branched or licrate distally. Stems of processes 6'' and anterior sulcal may coalesce proximally.
On hypocyst, processes on paraplates 2''' to 5''' have licrate structures with ends of arcuations also directed equatorially. Thus, on dorsal and lateral surfaces, open ends of licrate terminations of opposed precingular and postcingular processes face each other.
Processes on paraplates 1''', 6''' and posterior sulcal are of similar size to each other and may be licrate or branched distally. The two antapical processes have relatively narrow stems and licrate tips whose open ends face each other medially.
Excystment type: Archeopyle apical; however, isolated opercula have not been observed, so number of apical processes and hence apical ParaPlates cannot be confirmed.
Paratabulation: Indicated on epicyst by principal archeopyle and short accessory sutures, when the latter are developed, and by positions of intratabular processes. On hypocyst, paratabulation expressed by locations of processes only. Process formula: ?4', 6'', 0c, 6''', 2'''', 1 as, 1ps. Seven processes present subjacent to archeopyle margin; hypocystal configuration partiform.
Paracingulum: Position indicated by absence of processes.
Parasulcus: Limits of parasulcus marked anteriorly by sulcal notch and anterior sulcal process and
posteriorly by posterior sulcal process.
Size: Intermediate to large; measurements of 6 specimens: body diameter 47 Ám to 56 Ám, overall diameter 85 Ám to 110 Ám, process length 20 Ám to 28 Ám, process width at midheight 2 Ám to 12 Ám and width of tips 10 Ám to 35 Ám.
Comments:
Enneadocysta deconinckii is characterized by having a single anterior parasulcal process but no cingular processes and some processes with two distally united stems.
Holotype:
Specimen illustrated in Plate 2, Figures 3a-f. Location: EPR slide 2753AB-LB, coordinates R12.4+00.2, Exxon Production Co., Research Center, Houston, Texas, U.S.A.
Type locality and stratum:
Locality: Belgian Basin, Assenede Well at coordinates 107.614/215.180, Belgium.
Stratum: Section at 25.20 meters, probably Upper Eocene (Priabonian) and at or very near the Middle Eocene-Upper Eocene boundary.
Stratigraphic and geographic data:
The species is known only from the type locality in Belgium, where it occurs in the section from 61.90 meters to 25.20 meters (upper Middle Eocene, Bartonian to Lower Oligocene, Rupelian).
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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.
Enneadocysta deconinckii Stover and Williams, 1995, has 20 intratabular processes, 11 on the epicyst and 9 on the hypocyst. There are no cingular processes, but there is an anterior sulcal. Some process stems are branched at midlength and some may have two distinct, distally joined stems. Most process terminations are licrate. Processes on 2" to 5" with relatively wide or branched stems. Process formula: ?4', 6", 0c, 6"’, 2"”, 1as, 1ps. Size: Body diameter 47-56 µm, overall 85-110 µm, process length 20-28 µm, width at midheight 2-12 µm, width of tips 10-35 µm.
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Stover and Williams, 1995, p. 110
Enneadocysta deconinckii Stover and Williams sp. nov. Plate 2, figures 3a-f; plate 3, figures 1a-c; text-figure 1, nos. D, F
Description:
Shape: Cysts skolochorate with subspherical to nearly subspherical central body.
Wall relationships: Autophragm only.
Wall features: Autophragm finely granulate or pitted and bearing 20 intratabular processes, 11 on epicyst, nine on hypocyst. Paracingular processes absent but a single anterior parasulcal process is consistently present. Process stems solid, generally smooth but may be faintly fibroid, expanded slightly proximally, more so distally; some process stems branched at about midlength and some processes may have two distinct, distally joined stems. Most process terminations licrate, less commonly branched, and with flared part of distal structures solid or minutely fenestrate. Licrate tips shallowly arcuate to semicircular or horseshoe-shaped, with smooth inner margins and finely denticulate or spinulate outer margins.
Processes on paraplates 2'' to 5'' with relatively wide or branched stems and licrate tips with ends of arcuations directed equatorially.
Ventral processes 1'', 6'', and anterior sulcal typically narrower than those on dorsal and lateral surfaces and branched or licrate distally. Stems of processes 6'' and anterior sulcal may coalesce proximally.
On hypocyst, processes on paraplates 2''' to 5''' have licrate structures with ends of arcuations also directed equatorially. Thus, on dorsal and lateral surfaces, open ends of licrate terminations of opposed precingular and postcingular processes face each other.
Processes on paraplates 1''', 6''' and posterior sulcal are of similar size to each other and may be licrate or branched distally. The two antapical processes have relatively narrow stems and licrate tips whose open ends face each other medially.
Excystment type: Archeopyle apical; however, isolated opercula have not been observed, so number of apical processes and hence apical ParaPlates cannot be confirmed.
Paratabulation: Indicated on epicyst by principal archeopyle and short accessory sutures, when the latter are developed, and by positions of intratabular processes. On hypocyst, paratabulation expressed by locations of processes only. Process formula: ?4', 6'', 0c, 6''', 2'''', 1 as, 1ps. Seven processes present subjacent to archeopyle margin; hypocystal configuration partiform.
Paracingulum: Position indicated by absence of processes.
Parasulcus: Limits of parasulcus marked anteriorly by sulcal notch and anterior sulcal process and
posteriorly by posterior sulcal process.
Size: Intermediate to large; measurements of 6 specimens: body diameter 47 Ám to 56 Ám, overall diameter 85 Ám to 110 Ám, process length 20 Ám to 28 Ám, process width at midheight 2 Ám to 12 Ám and width of tips 10 Ám to 35 Ám.
Comments:
Enneadocysta deconinckii is characterized by having a single anterior parasulcal process but no cingular processes and some processes with two distally united stems.
Holotype:
Specimen illustrated in Plate 2, Figures 3a-f. Location: EPR slide 2753AB-LB, coordinates R12.4+00.2, Exxon Production Co., Research Center, Houston, Texas, U.S.A.
Type locality and stratum:
Locality: Belgian Basin, Assenede Well at coordinates 107.614/215.180, Belgium.
Stratum: Section at 25.20 meters, probably Upper Eocene (Priabonian) and at or very near the Middle Eocene-Upper Eocene boundary.
Stratigraphic and geographic data:
The species is known only from the type locality in Belgium, where it occurs in the section from 61.90 meters to 25.20 meters (upper Middle Eocene, Bartonian to Lower Oligocene, Rupelian).
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