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Areosphaeridium diktyoplokus ssp. diktyoplokus
Areosphaeridium diktyoplokus ssp. diktyoplokus
Autonym
Now redundant. Originally Hystrichosphaeridium diktyoplokus subsp. diktyoplokus, subsequently Cordosphaeridium diktyoplokus subsp. diktyoplokus, thirdly Areosphaeridium diktyoplokus subsp. diktyoplokus.
Holotype: Klumpp, 1953, pl.18, fig.3-4
Paratypes: Klumpp, 1953
Locus typicus: Borehole at Wöhrden, Holstein, Germany
Stratum typicum: Eocene
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Original description as Hystrichosphaeridium diktyoplokus: [Klumpp 1953, p. 392]: (Translation: LPP)
Diagnosis:
A species of the genus Hystrichosphaeridium with the next characteristic features: The membrane of the shell is one-layered; more or less reticulate ornamented; the processes are bulges of the membrane.
Description:
The spherical shell is fragile and very transparent. In spite of their slenderness, the processes are merely tubular bulges of the membrane. The processes end in a sort of soft reticulate collar.
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Emended diagnosis:
Eaton, 1971, p. 359:
Diagnosis:
The central body has a subcircular to subquadrate outline and a finely granular surface.
The processes are intratabular and have solid fibrous stems of variable length and breadth. Each process terminates in a broad, net-like distal platform which is circular to polygonal in outline with an irregular to entire distal margin.
Fenestration may be present in the process stems, producing stem branches and branch complexes. The cingular zone is typically devoid of processes, although occasionally one or two very slender processes may be present on this zone. On the other zones there is one process or branch complex per plate, reflecting the tabulation of 4", 6"", 5-6""", 0-1p, 1"""".
The archaeopyle is apical, tetratabular.
Affinities: (p. 360):
Areosphaeridium diktyoplokus is distinguished from all other species of dinoflagellate cysts by its reflected tabulation, the absence or scarcity of cingular processes, the presence of an apical tetratabular archaeopyle, and the distal complexity of the solid, fibrous processes.
An extensive discussion is given by Eaton, 1971, p. 395-360.
Autonym
Now redundant. Originally Hystrichosphaeridium diktyoplokus subsp. diktyoplokus, subsequently Cordosphaeridium diktyoplokus subsp. diktyoplokus, thirdly Areosphaeridium diktyoplokus subsp. diktyoplokus.
Holotype: Klumpp, 1953, pl.18, fig.3-4
Paratypes: Klumpp, 1953
Locus typicus: Borehole at Wöhrden, Holstein, Germany
Stratum typicum: Eocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description as Hystrichosphaeridium diktyoplokus: [Klumpp 1953, p. 392]: (Translation: LPP)
Diagnosis:
A species of the genus Hystrichosphaeridium with the next characteristic features: The membrane of the shell is one-layered; more or less reticulate ornamented; the processes are bulges of the membrane.
Description:
The spherical shell is fragile and very transparent. In spite of their slenderness, the processes are merely tubular bulges of the membrane. The processes end in a sort of soft reticulate collar.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Emended diagnosis:
Eaton, 1971, p. 359:
Diagnosis:
The central body has a subcircular to subquadrate outline and a finely granular surface.
The processes are intratabular and have solid fibrous stems of variable length and breadth. Each process terminates in a broad, net-like distal platform which is circular to polygonal in outline with an irregular to entire distal margin.
Fenestration may be present in the process stems, producing stem branches and branch complexes. The cingular zone is typically devoid of processes, although occasionally one or two very slender processes may be present on this zone. On the other zones there is one process or branch complex per plate, reflecting the tabulation of 4", 6"", 5-6""", 0-1p, 1"""".
The archaeopyle is apical, tetratabular.
Affinities: (p. 360):
Areosphaeridium diktyoplokus is distinguished from all other species of dinoflagellate cysts by its reflected tabulation, the absence or scarcity of cingular processes, the presence of an apical tetratabular archaeopyle, and the distal complexity of the solid, fibrous processes.
An extensive discussion is given by Eaton, 1971, p. 395-360.