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Spiniferites spumeus
Spiniferites spumeus Harding 1990 ex Harding in Williams et al. 1998, p.581.
Name not validly published in Harding 1990b since lodgment of holotype not specified.
Holotype: Harding, 1990, pl.6, fig.1
Locus typicus: O. Gott Claypitt, Lower Saxony, Germany
Stratum typicum: Late Barremian
Original diagnosis: Harding, 1990, p.24
Shape: Ambitus prolate ovoid, modified by gonal processes up to 1/3 of body diameter in length. Epicyst and hypocyst of equal lengths. Little or no dorso-ventral compression.
Phragma: "Differentiated autophragm", up to 2.5 µm thick. Wall consists of a spongy (vacuolar) layer of sporopollenin. Thickness of wall apparently reduced along parasutures. Cyst surface of "orange-peel" texture, pseudo-punctate. Low parasutural crests indented into cyst surface, surmounted by basally hollow gonal processes, angular in section. Processes trifurcate distally and may bifurcate once more.
Paratabulation: Sexiform, weakly S-type gonyaulacoid. Paratabulation formula: 4", 6", 6c, 6""", 1"""", lp, ?5s.
Archaeopyle: Type P4, lost as free monoplacoid operculum.
Paracingulum: Well developed. Paracingular gonal processes may be united across paracingulum up to the point of trifurcation, by the development of an often perforate septum. S-type, most paraplates usually being defined.
Parasulcus: The septa between the paracingular gonal processes may extend into the parasulcus and create a claustrum in the periphragm.
Dimensions: Length (75) 67.6 (63) µm. Width (65) 58.2 (51) µm. Specimens = 6 (6).
Affinities:
Harding, 1990, p. 24: This species differs from all the other members of the genus in its characteristic surface sculpture and the indented parasutural septa. A similar (ancestral?) species occurs in rocks of early Barremian age at Gott and Speeton, but always has intergonal processes and a thinner cyst wall.
Name not validly published in Harding 1990b since lodgment of holotype not specified.
Holotype: Harding, 1990, pl.6, fig.1
Locus typicus: O. Gott Claypitt, Lower Saxony, Germany
Stratum typicum: Late Barremian
Original diagnosis: Harding, 1990, p.24
Shape: Ambitus prolate ovoid, modified by gonal processes up to 1/3 of body diameter in length. Epicyst and hypocyst of equal lengths. Little or no dorso-ventral compression.
Phragma: "Differentiated autophragm", up to 2.5 µm thick. Wall consists of a spongy (vacuolar) layer of sporopollenin. Thickness of wall apparently reduced along parasutures. Cyst surface of "orange-peel" texture, pseudo-punctate. Low parasutural crests indented into cyst surface, surmounted by basally hollow gonal processes, angular in section. Processes trifurcate distally and may bifurcate once more.
Paratabulation: Sexiform, weakly S-type gonyaulacoid. Paratabulation formula: 4", 6", 6c, 6""", 1"""", lp, ?5s.
Archaeopyle: Type P4, lost as free monoplacoid operculum.
Paracingulum: Well developed. Paracingular gonal processes may be united across paracingulum up to the point of trifurcation, by the development of an often perforate septum. S-type, most paraplates usually being defined.
Parasulcus: The septa between the paracingular gonal processes may extend into the parasulcus and create a claustrum in the periphragm.
Dimensions: Length (75) 67.6 (63) µm. Width (65) 58.2 (51) µm. Specimens = 6 (6).
Affinities:
Harding, 1990, p. 24: This species differs from all the other members of the genus in its characteristic surface sculpture and the indented parasutural septa. A similar (ancestral?) species occurs in rocks of early Barremian age at Gott and Speeton, but always has intergonal processes and a thinner cyst wall.