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Hystrichosphaeridium centrocarpum
Hystrichosphaeridium centrocarpum Deflandre and Cookson, 1955
Now Operculodinium centrocarpum. Originally Hystrichosphaeridium centrocarpum, subsequently Baltisphaeridium centrocarpum, thirdly Cordosphaeridium centrocarpum, fourthly Cordosphaeridium tiara ssp. centrocarpum, fifthly (and now) Operculodinium centrocarpum, sixthly Cordosphaeridium microtriainum ssp. centrocarpum, seventhly Cleistosphaeridium centrocarpum.
Tax. sr. synonyrn of Membranilarnacia delicata Kar, 1969, according to Jain, 1980.
Matsuoka, 1985, considered this species to represent the encysted stage of Gonyaulax grindleyi Reinecke, 1967, which species is a tax. sr. synonym of Peridinium reticulatum Claparede and Lachmann, 1859, according to Dodge, 1989.
Holotype: Deflandre and Cookson, 1955, pl.8, figs.3-4
Locus typicus: Balcombe Bay, Victoria, Australia
Stratum typicum: Middle Miocene
Original description: Deflandre and Cookson, 1955, p. 273
Shell globular, more or less ellipsoidal (probably by deformation), covered with numerous straight, slender processes placed irregulary or with a certain alignment. Processes solid, showing radiating fibrils at their point of insertion on the shell, which is clearly ornamented with a fine reticulum. The slightly widened apices of the processes are fringed with 10 or more small curved spines (this structure is only visible with a high-powered objective).
Dimensions: Diameter of shell 54-80 Ám, length of processes 13-18 Ám, total diameter c. 97-115 Ám.
As a result of the relative thinness of the shell membrane none of the specimens has been completely intact. Most of the examples have a large irregular or more or less angular opening.
Affinities:
Deflandre and Cookson, 1955, p. 273: H. centrocarpum, in spite of its generally similar appearance, does not belong to the species group of H. recurvatum Delf. - H. major Lej.-Carp. known from the European Cretaceous flints. In these species the hollow processes have a quite different structure.
Now Operculodinium centrocarpum. Originally Hystrichosphaeridium centrocarpum, subsequently Baltisphaeridium centrocarpum, thirdly Cordosphaeridium centrocarpum, fourthly Cordosphaeridium tiara ssp. centrocarpum, fifthly (and now) Operculodinium centrocarpum, sixthly Cordosphaeridium microtriainum ssp. centrocarpum, seventhly Cleistosphaeridium centrocarpum.
Tax. sr. synonyrn of Membranilarnacia delicata Kar, 1969, according to Jain, 1980.
Matsuoka, 1985, considered this species to represent the encysted stage of Gonyaulax grindleyi Reinecke, 1967, which species is a tax. sr. synonym of Peridinium reticulatum Claparede and Lachmann, 1859, according to Dodge, 1989.
Holotype: Deflandre and Cookson, 1955, pl.8, figs.3-4
Locus typicus: Balcombe Bay, Victoria, Australia
Stratum typicum: Middle Miocene
Original description: Deflandre and Cookson, 1955, p. 273
Shell globular, more or less ellipsoidal (probably by deformation), covered with numerous straight, slender processes placed irregulary or with a certain alignment. Processes solid, showing radiating fibrils at their point of insertion on the shell, which is clearly ornamented with a fine reticulum. The slightly widened apices of the processes are fringed with 10 or more small curved spines (this structure is only visible with a high-powered objective).
Dimensions: Diameter of shell 54-80 Ám, length of processes 13-18 Ám, total diameter c. 97-115 Ám.
As a result of the relative thinness of the shell membrane none of the specimens has been completely intact. Most of the examples have a large irregular or more or less angular opening.
Affinities:
Deflandre and Cookson, 1955, p. 273: H. centrocarpum, in spite of its generally similar appearance, does not belong to the species group of H. recurvatum Delf. - H. major Lej.-Carp. known from the European Cretaceous flints. In these species the hollow processes have a quite different structure.