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Selenopemphix crenata
Selenopemphix crenata Matsuoka and Bujak, 1988
Holotype: Matsuoka and Bujak, 1980, pl.10, fig.6; text-fig. 15
Paratype: Matsuoka and Bujak, 1980
Locus typicus: Norton Sound COST No. 1 Well, 4380-4410ft, Norton Sound, Bering Sea
Stratum typicum: Late Miocene
Original diagnosis: Matsuoka and Bujak, 1980, p.70-71
Small proximate cyst, circular to reniform in polar view, strongly compressed along the polar axis. Cyst wall pigmented brown, comprising a smooth to chagrinate autophragm. A single small apical horn present; two antapical horns undifferentiated and forming a single broad, truncated projection. Paratabulation unrepresented except for archeopyle sutures. Paracingulum delimited by two finely serrate parallel ridges; parasulcus indicated by shallow indentation of the autophragm Archeopyle intercalary and offset to the right of the dorsal midline. Operculum comprising paraplate 2a. Dimensions: Holotype; cyst diameter 34 µm, height of paracingular list ca. 2 µm, Range; cyst diameter 34-74 µm. Number of specimens measured; 3.
Original description: Matsuoka and Bujak, 1980, p.71
The small proximate cyst is compressed dorso-ventrally, brounish in color and does not fluoresce. The cyst wall consists of a smooth to slightly granulate autophragm without ornament. The epicyst has a small apical boss and the hypocyst possesses a single broad antapical projection. The paracingulum is characterized by two parallel ridges with vaginate to crenulate margins. The parasulcus is short, distinctive, is represented by a shallow indentation of the autophragm and does not extend onto the epicyst. The archeopyle is hexagonal intercalary, formed by the loss of paraplate 2a and is displaced to the right of the dorsal midline.
Thecal affinities; Unknown, but this species is probably related to the modern Protoperidinium subinerme based on its cyst shape and archeopyle.
Matsuoka and Bujak, 1980, p.71-72: Selenopemphix crenata is similar to S. nephroides, but differs in having serrate paracingular margins. It also differs from S. coronata Bujak in lacking bifurcate spines on the paracingular crests, and from S. selenoides Benedek in lacking a perforated autophragm and in Selenopemphix sp. C of Duffield and Stein (1986, pl.1, fig.6) and Selenopemphix sp. E of Duffield and Stein (1986, pl.1, fig.9) in possessing a denticulate paracingular margin, but differs from them in possessing serrate paracingular ridge.
Holotype: Matsuoka and Bujak, 1980, pl.10, fig.6; text-fig. 15
Paratype: Matsuoka and Bujak, 1980
Locus typicus: Norton Sound COST No. 1 Well, 4380-4410ft, Norton Sound, Bering Sea
Stratum typicum: Late Miocene
Original diagnosis: Matsuoka and Bujak, 1980, p.70-71
Small proximate cyst, circular to reniform in polar view, strongly compressed along the polar axis. Cyst wall pigmented brown, comprising a smooth to chagrinate autophragm. A single small apical horn present; two antapical horns undifferentiated and forming a single broad, truncated projection. Paratabulation unrepresented except for archeopyle sutures. Paracingulum delimited by two finely serrate parallel ridges; parasulcus indicated by shallow indentation of the autophragm Archeopyle intercalary and offset to the right of the dorsal midline. Operculum comprising paraplate 2a. Dimensions: Holotype; cyst diameter 34 µm, height of paracingular list ca. 2 µm, Range; cyst diameter 34-74 µm. Number of specimens measured; 3.
Original description: Matsuoka and Bujak, 1980, p.71
The small proximate cyst is compressed dorso-ventrally, brounish in color and does not fluoresce. The cyst wall consists of a smooth to slightly granulate autophragm without ornament. The epicyst has a small apical boss and the hypocyst possesses a single broad antapical projection. The paracingulum is characterized by two parallel ridges with vaginate to crenulate margins. The parasulcus is short, distinctive, is represented by a shallow indentation of the autophragm and does not extend onto the epicyst. The archeopyle is hexagonal intercalary, formed by the loss of paraplate 2a and is displaced to the right of the dorsal midline.
Thecal affinities; Unknown, but this species is probably related to the modern Protoperidinium subinerme based on its cyst shape and archeopyle.
Matsuoka and Bujak, 1980, p.71-72: Selenopemphix crenata is similar to S. nephroides, but differs in having serrate paracingular margins. It also differs from S. coronata Bujak in lacking bifurcate spines on the paracingular crests, and from S. selenoides Benedek in lacking a perforated autophragm and in Selenopemphix sp. C of Duffield and Stein (1986, pl.1, fig.6) and Selenopemphix sp. E of Duffield and Stein (1986, pl.1, fig.9) in possessing a denticulate paracingular margin, but differs from them in possessing serrate paracingular ridge.