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Spiniferites foveolatus
Spiniferites foveolatus Schioler, 1993
Holotype: Schioler, 1993, pl.5, fig.2
Paraptypes: Schioler, 1993
Locus typicus: Dan Field, Danish North Sea
Stratum typicum: Late Maastrichtian
Original diagnosis: Schioler, 1993, p.111
A skolochorate gonyaulacoid cyst in which the endo- and periphragm are appressed between the processes. The processes occupy gonal positions and terminate trifurcate and bifurcate. Low to intermediate septal crests connect the processes. The periphragm is smooth, the endophragm is foveolate; the foveolation descends approximately half-way down the endophragm.
Original description: Schioler, 1993, p.111
A skolochorate gonyaulacoid cyst with gonal processes. The endo- and periphragm are appressed between processes. The processes are solid with distal biand trifurcations, and are proximally connected by septal crests of low to intermediate height. The periphragm is entire and smooth. The endophragm is thicker than the periphragm and ornamented with circular to vermiculate pits and foveolae, descending approximately half way through the phragm. The dimension of the ornament is 1 - 2 µm. The ornament generally occupies a penitabular
position on the paraplates. The number of foveolae and pits in the larger paraplates is 20 - 40. Paratabulation and archaeopyle type as for the genus.
Dimensions (in µm): holotype range
Overall length of pericyst8170 (77) 84
Overall width of pericyst7361 (72) 81
length of endocyst 4440 (44) 49
width of endocyst 4135 (41) 52
Specimens measured: 10
Affinities:
Schioler, 1993, p.111: The new species is distinguished from all other
species of Spiniferites by its foveolate endophragm.
Spiniferites ramosus endoperforatus (Corradini 1973) Lentin and Williams 1975 has a perforate endophragm with perforations much smaller than the foveolation of the new species, judging from the illustrations of Corradini"s holotype. Due to its generally penitabular arangement, its restriction to the endophragm, and its consistent occurrence within a population, the ornament is not considered a
preservational artefact, but an original morphological feature.
Holotype: Schioler, 1993, pl.5, fig.2
Paraptypes: Schioler, 1993
Locus typicus: Dan Field, Danish North Sea
Stratum typicum: Late Maastrichtian
Original diagnosis: Schioler, 1993, p.111
A skolochorate gonyaulacoid cyst in which the endo- and periphragm are appressed between the processes. The processes occupy gonal positions and terminate trifurcate and bifurcate. Low to intermediate septal crests connect the processes. The periphragm is smooth, the endophragm is foveolate; the foveolation descends approximately half-way down the endophragm.
Original description: Schioler, 1993, p.111
A skolochorate gonyaulacoid cyst with gonal processes. The endo- and periphragm are appressed between processes. The processes are solid with distal biand trifurcations, and are proximally connected by septal crests of low to intermediate height. The periphragm is entire and smooth. The endophragm is thicker than the periphragm and ornamented with circular to vermiculate pits and foveolae, descending approximately half way through the phragm. The dimension of the ornament is 1 - 2 µm. The ornament generally occupies a penitabular
position on the paraplates. The number of foveolae and pits in the larger paraplates is 20 - 40. Paratabulation and archaeopyle type as for the genus.
Dimensions (in µm): holotype range
Overall length of pericyst8170 (77) 84
Overall width of pericyst7361 (72) 81
length of endocyst 4440 (44) 49
width of endocyst 4135 (41) 52
Specimens measured: 10
Affinities:
Schioler, 1993, p.111: The new species is distinguished from all other
species of Spiniferites by its foveolate endophragm.
Spiniferites ramosus endoperforatus (Corradini 1973) Lentin and Williams 1975 has a perforate endophragm with perforations much smaller than the foveolation of the new species, judging from the illustrations of Corradini"s holotype. Due to its generally penitabular arangement, its restriction to the endophragm, and its consistent occurrence within a population, the ornament is not considered a
preservational artefact, but an original morphological feature.