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Gongylodinium erymnoteichon
Gongylodinium erymnoteichon Fenton et al., 1980
Now Dissiliodinium. Originally Gongylodinium, subsequently (and now) Dissiliodinium. Feist-Burkhardt and Monteil (1997, p.43; 2001, p.64) retained this species in Gongylodinium.
Holotype: Fenton et al., 1980, pl.14, fig.8-9
Locus typicus: Hook Norton, Oxfordshire, England
Stratum typicum: Late Bajocian-Early Bathonian
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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.
Gongylodinium erymnoteichon Fenton et al., 1980, emend. Feist-Burkhardt and Monteil, 1997, as emended by Feist-Burkhardt and Monteil (1997), Cysts proximate, subspherical. Autophragm thin, covered with a thick layer of granular elements forming a spongy cyst wall (pedium with thick granulous to spongy luxuria without tegillum in the terminology of Below). Archeopyle formed by the loss of the two precingular paraplates 3" and 4", archeopyle type 2P. Paratabulation indicated by archeopyle only. Partial epicystal paratabulation formula ?pr, 4', 6". Paracingulum not expressed. Parasulcal area indicated by a depression.
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Original diagnosis: Fenton et al., 1980, p. 158
Proximate, non-tabulate cyst, spheroidal to slightly ovoidal outline. Paracingulum absent; parasulcus occasionally defined by reduction or absence of ornament. Archaeopyle formed by loss of two paraplates corresponding to a dorsal precingular position relative to the parasulcus. Double-layered wall thick, densely covered with squat spines, coni, and papillae.
Original description: Fenton et al., 1980, p. 158-159
The normally spherical cyst is prone to collapse when the opercular paraplates are lost or have fallen inside the autocoel. Short accessory archaeopyle parasutures may occur, vaguely defining apical or ?paracingular paraplates. Occasionally a protrusion occurs at the mid-point of the anterior margin of the archaeopyle representing an anterior intercalary paraplate.
The wall is 1.5-2 µm thick and appears fairly homogeneous, with a dense cover of squat, blunt, or pointed spines, coni, or papillae, 0.5 µm high. The ornament may be absent or reduced on the depressed elongate parasulcal area which may be the location of preferential folding.
Dimensions. Cyst diameter--44(51)57 µm (15 specimens measured); holotype diameter--46 µm.
Now Dissiliodinium. Originally Gongylodinium, subsequently (and now) Dissiliodinium. Feist-Burkhardt and Monteil (1997, p.43; 2001, p.64) retained this species in Gongylodinium.
Holotype: Fenton et al., 1980, pl.14, fig.8-9
Locus typicus: Hook Norton, Oxfordshire, England
Stratum typicum: Late Bajocian-Early Bathonian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Gongylodinium erymnoteichon Fenton et al., 1980, emend. Feist-Burkhardt and Monteil, 1997, as emended by Feist-Burkhardt and Monteil (1997), Cysts proximate, subspherical. Autophragm thin, covered with a thick layer of granular elements forming a spongy cyst wall (pedium with thick granulous to spongy luxuria without tegillum in the terminology of Below). Archeopyle formed by the loss of the two precingular paraplates 3" and 4", archeopyle type 2P. Paratabulation indicated by archeopyle only. Partial epicystal paratabulation formula ?pr, 4', 6". Paracingulum not expressed. Parasulcal area indicated by a depression.
--------------------------------------------------
Original diagnosis: Fenton et al., 1980, p. 158
Proximate, non-tabulate cyst, spheroidal to slightly ovoidal outline. Paracingulum absent; parasulcus occasionally defined by reduction or absence of ornament. Archaeopyle formed by loss of two paraplates corresponding to a dorsal precingular position relative to the parasulcus. Double-layered wall thick, densely covered with squat spines, coni, and papillae.
Original description: Fenton et al., 1980, p. 158-159
The normally spherical cyst is prone to collapse when the opercular paraplates are lost or have fallen inside the autocoel. Short accessory archaeopyle parasutures may occur, vaguely defining apical or ?paracingular paraplates. Occasionally a protrusion occurs at the mid-point of the anterior margin of the archaeopyle representing an anterior intercalary paraplate.
The wall is 1.5-2 µm thick and appears fairly homogeneous, with a dense cover of squat, blunt, or pointed spines, coni, or papillae, 0.5 µm high. The ornament may be absent or reduced on the depressed elongate parasulcal area which may be the location of preferential folding.
Dimensions. Cyst diameter--44(51)57 µm (15 specimens measured); holotype diameter--46 µm.