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Dissiliodinium erymnoteichon
Dissiliodinium erymnoteichon (Fenton et al., 1980) Prauss, 1989; Emendation: Feist-Burkhardt and Monteil, 1997, p.43.
Originally (and now) Gongylodinium, subsequently Dissiliodinium. Feist-Burkhardt and Monteil (1997, p.43; 2001, p.64)retained this species in Gongylodinium
Holotype: Fenton et al., 1980, pl.14, figs.8-9; Fensome et al., 1993a, figs.2-3 - p.1149.
Locus typicus: Hook Norton, Oxfordshire, England
Stratum typicum: Late Bajocian-Early Bathonian
Original diagnosis: Fenton et al., 1980, p. 158: Gongylodinium erymnoteichos
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: Gongylodinium erymnoteichos
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 Ám thick and appears fairly homogeneous, with a dense cover of squat, blunt, or pointed spines, coni, or papillae, 0.5 Ám 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 Ám (15 specimens measured); holotype diameter 46 Ám.
Originally (and now) Gongylodinium, subsequently Dissiliodinium. Feist-Burkhardt and Monteil (1997, p.43; 2001, p.64)retained this species in Gongylodinium
Holotype: Fenton et al., 1980, pl.14, figs.8-9; Fensome et al., 1993a, figs.2-3 - p.1149.
Locus typicus: Hook Norton, Oxfordshire, England
Stratum typicum: Late Bajocian-Early Bathonian
Original diagnosis: Fenton et al., 1980, p. 158: Gongylodinium erymnoteichos
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: Gongylodinium erymnoteichos
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 Ám thick and appears fairly homogeneous, with a dense cover of squat, blunt, or pointed spines, coni, or papillae, 0.5 Ám 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 Ám (15 specimens measured); holotype diameter 46 Ám.