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Oligosphaeridium reniforme
Oligosphaeridium reniforme (Tasch, 1964) Davey, 1969
Originally Hystrichosphaeridium, subsequently Oligosphaeridium.
Tax. jr. synonym of Oligosphaeridium irregulare (Pocock, 1962) Davey and Williams, 1969, according to Stover and Evitt, 1978, which species is a tax. jr. synonym of Oligosphaeridium albertense (Pocock, 1962) Davey and Williams, 1969, according to Jansonius, 1986.
This combination was not validly published in Davey and Williams, 1966, since these authors did not fully reference the basionym.
Holotype: Tasch, 1964, pl.2, fig.6
Locus typicus: Clark County, Kansas, U.S.A.
Stratum typicum: Albian
Original diagnosis: Tasch,, 1964, p.193: Hystrichosphaeridium reniforme
Shell reniform, with few, thick processes that markedly expand from origins on shell to process extremity, assuming an eccentric, funnellike configuration; extremities of processes flat, or splitting into brief, thin, straight or recurved extensions. Twelve processes spaced on body in groups of three.
Dimensions: Holotype: Length 52 µm; width 36 µm; maximum length of processes 20 µm; width of processes 2-5 µm; maximum width of flare at extremities of processes 12 µm.
Supplemental description: Davey, 1969, p. 149:
The shell is subspherical to ovoidal, shell wall lightly granular. The processes are hollow, tubiform, widening distally into a broad, flat-topped funnel.
The distal margin of the funnel bears a small number of pointed and irregularly shaded spines. Distally the processes sometimes possess large, subcircular perforations. An apical archaeopyle is typically developed.
Dimensions: Range of observed specimens: diameter of central body 31(42.4)49 µm maximum length of processes 20(24.9)30 µm. 7 specimens measured.
Affinities:
Davey, 1969, p149: The specimens appear to be very similar to the type material from the Albian of Kansas although Tasch did not describe the presence of distal perforations. O. reitiforme differs from O. antophorum and 0. perforatum (Gocht, 1959) by the presence of distal spines. It differs from O. pulcherrimum Deflandre and Cookson (1955) in that the processes possess only a few spines, are not so complexly perforate and distally are flat-topped.
Originally Hystrichosphaeridium, subsequently Oligosphaeridium.
Tax. jr. synonym of Oligosphaeridium irregulare (Pocock, 1962) Davey and Williams, 1969, according to Stover and Evitt, 1978, which species is a tax. jr. synonym of Oligosphaeridium albertense (Pocock, 1962) Davey and Williams, 1969, according to Jansonius, 1986.
This combination was not validly published in Davey and Williams, 1966, since these authors did not fully reference the basionym.
Holotype: Tasch, 1964, pl.2, fig.6
Locus typicus: Clark County, Kansas, U.S.A.
Stratum typicum: Albian
Original diagnosis: Tasch,, 1964, p.193: Hystrichosphaeridium reniforme
Shell reniform, with few, thick processes that markedly expand from origins on shell to process extremity, assuming an eccentric, funnellike configuration; extremities of processes flat, or splitting into brief, thin, straight or recurved extensions. Twelve processes spaced on body in groups of three.
Dimensions: Holotype: Length 52 µm; width 36 µm; maximum length of processes 20 µm; width of processes 2-5 µm; maximum width of flare at extremities of processes 12 µm.
Supplemental description: Davey, 1969, p. 149:
The shell is subspherical to ovoidal, shell wall lightly granular. The processes are hollow, tubiform, widening distally into a broad, flat-topped funnel.
The distal margin of the funnel bears a small number of pointed and irregularly shaded spines. Distally the processes sometimes possess large, subcircular perforations. An apical archaeopyle is typically developed.
Dimensions: Range of observed specimens: diameter of central body 31(42.4)49 µm maximum length of processes 20(24.9)30 µm. 7 specimens measured.
Affinities:
Davey, 1969, p149: The specimens appear to be very similar to the type material from the Albian of Kansas although Tasch did not describe the presence of distal perforations. O. reitiforme differs from O. antophorum and 0. perforatum (Gocht, 1959) by the presence of distal spines. It differs from O. pulcherrimum Deflandre and Cookson (1955) in that the processes possess only a few spines, are not so complexly perforate and distally are flat-topped.