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Amphorosphaeridium latitubulum
Amphorospaheridium latitubulum, Davey, 1969
Holotype: Davey, 1969, pl.4, fig.2
Locus typicus: Northern Natal, South Africa
Stratum typicum: Campanian-Maastrichtian
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Original description: Davey, 1969, p. 34
Diagnosis:
Central body ovoidal bearing two, rarely three, fibrous processes per plate-area,
Processes tubiform, short (less than one-quarter central body diameter), of variable width with entire distal margins. Apical process broad and branched; antapical process relatively large and tubiform.
Archaeopyle typically present.
Description:
The ovoidal central body is elongated along the polar axis and possesses the fibro-pitted periphragm typical of this genus.
The short tubiform processes, although being of constant length, are extremely variable in width. The processes possess longitudinal fibres which extend on to the surface of the central body. The walls of the processes, however, are weak and distortion is common. Distally the processes expand slightly and typically have an entire undulatory margin (fig. 1, no. 4), but very occasionally one or two processes may bear spines. The cingulum is sometimes aligned by pits or processes. The apical process is abnormally broad proximally and typically subdivides into two or three branches either proximally or medially.
Affinities:
A. Iatitubulum in overall appearance most closely resembles A. multibrevum. They differ primarily in that the processes of the latter species are often ribbed and are spinous distally. The processes of the former also are more variable in width and fewer in number.
Holotype: Davey, 1969, pl.4, fig.2
Locus typicus: Northern Natal, South Africa
Stratum typicum: Campanian-Maastrichtian
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Original description: Davey, 1969, p. 34
Diagnosis:
Central body ovoidal bearing two, rarely three, fibrous processes per plate-area,
Processes tubiform, short (less than one-quarter central body diameter), of variable width with entire distal margins. Apical process broad and branched; antapical process relatively large and tubiform.
Archaeopyle typically present.
Description:
The ovoidal central body is elongated along the polar axis and possesses the fibro-pitted periphragm typical of this genus.
The short tubiform processes, although being of constant length, are extremely variable in width. The processes possess longitudinal fibres which extend on to the surface of the central body. The walls of the processes, however, are weak and distortion is common. Distally the processes expand slightly and typically have an entire undulatory margin (fig. 1, no. 4), but very occasionally one or two processes may bear spines. The cingulum is sometimes aligned by pits or processes. The apical process is abnormally broad proximally and typically subdivides into two or three branches either proximally or medially.
Affinities:
A. Iatitubulum in overall appearance most closely resembles A. multibrevum. They differ primarily in that the processes of the latter species are often ribbed and are spinous distally. The processes of the former also are more variable in width and fewer in number.