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Systematophora curta
Systematophora? curta Matsuoka and Bujak, 1988
Originally Systematophora curta, subsequently (and now) Systematophora? curta, thirdly Systematophora placacantha var. curta. Eaton et al. (2001, p.190) retained this taxon, without question, as Systematophora curta. Questionable assignment: Stancliffe and Sarjeant (1990, p.208) and Courtinat, Londeix and Pourtoy in Fauconnier and Masure (2004, p.526–527).
Holotype: Matsuoka and Bujak, 1988, pl.15, fig.9
Paratype: Matsuoka and Bujak, 1988
Locus typicus: Navarin Basin COST No. 1 Well, 6660-6750ft, Navarin Basin, Bering Sea
Stratum typicum: Late Oligocene-early Miocene
Diagnosis: Matsuoka and Bujak, 1988, p.85
Intermediate subspherical proximochorate cyst with slight polar compression. Cyst surface finely granulate. Paratabulation represented by penitabular process complexes as 4", 6", 6c, 6""", 1p(?), 1"""", 0s. Penitabular complexes variable; apical area having incomplete annulate types with two to four small processes on each paraplate; pre- and postcingular areas with six box-like penitabular complexes but the 1""" process complex somewhat reduced and small; antapical area possessing one large annulate complex. Processes short, solid, wide and tubiform to buccinate with simple flat distal extremities. Most of bases of the adjacent processes not connecting and reduced. Paracingulum delineated by six rectilinear complexes and approximately circular; parasulcus with process complexes. Archeopyle tetratabular, apical, formed by the loss of four paraplates.
Original description: Matsuoka and Bujak, 1988, p.85
The cyst body is subspherical, without horns at the apex and antapex, but sometimes has processes at the apex that are longer than the other processes. The cyst wall consists of two layers which are strongly adpressed over most of the cyst body. The penitabular complexes are annulate or rectilinear. The processes are usually wide and short, with slightly recurved or simple distal tips. Three apical penitabular complexes are present, but one of these probably includes the 1" and 4" paraplates based on its shape (Text-fig. 21). The first postcingular process complex is very small. The paracingulum is represented by approximately six recti linear ridges, and is almost circular. The parasulcus lacks processes. The archeopyle is apical and is formed by the loss of all of the apical paraplates.
Dimensions: Holotype; cyst diameter 48 µm, length of processes 6-7 µm. Range; cyst diameter 43-53 µm, length of processes 5-9 µm, diameter of free operculum, 35 x 38 µm-41 x 39 µm. Number of specimens measured; 8.
Affinities:
Matsuoka and Bujak, 1988, p. 85: Systematophora cruta is characterized by the possession of well-developed penitabular complexes and processes that are mostly solid, wide, cylindrical to tubiform, with simple or recurved distal extremities. The species differs from other species of Systematophora because of its short processes.
Originally Systematophora curta, subsequently (and now) Systematophora? curta, thirdly Systematophora placacantha var. curta. Eaton et al. (2001, p.190) retained this taxon, without question, as Systematophora curta. Questionable assignment: Stancliffe and Sarjeant (1990, p.208) and Courtinat, Londeix and Pourtoy in Fauconnier and Masure (2004, p.526–527).
Holotype: Matsuoka and Bujak, 1988, pl.15, fig.9
Paratype: Matsuoka and Bujak, 1988
Locus typicus: Navarin Basin COST No. 1 Well, 6660-6750ft, Navarin Basin, Bering Sea
Stratum typicum: Late Oligocene-early Miocene
Diagnosis: Matsuoka and Bujak, 1988, p.85
Intermediate subspherical proximochorate cyst with slight polar compression. Cyst surface finely granulate. Paratabulation represented by penitabular process complexes as 4", 6", 6c, 6""", 1p(?), 1"""", 0s. Penitabular complexes variable; apical area having incomplete annulate types with two to four small processes on each paraplate; pre- and postcingular areas with six box-like penitabular complexes but the 1""" process complex somewhat reduced and small; antapical area possessing one large annulate complex. Processes short, solid, wide and tubiform to buccinate with simple flat distal extremities. Most of bases of the adjacent processes not connecting and reduced. Paracingulum delineated by six rectilinear complexes and approximately circular; parasulcus with process complexes. Archeopyle tetratabular, apical, formed by the loss of four paraplates.
Original description: Matsuoka and Bujak, 1988, p.85
The cyst body is subspherical, without horns at the apex and antapex, but sometimes has processes at the apex that are longer than the other processes. The cyst wall consists of two layers which are strongly adpressed over most of the cyst body. The penitabular complexes are annulate or rectilinear. The processes are usually wide and short, with slightly recurved or simple distal tips. Three apical penitabular complexes are present, but one of these probably includes the 1" and 4" paraplates based on its shape (Text-fig. 21). The first postcingular process complex is very small. The paracingulum is represented by approximately six recti linear ridges, and is almost circular. The parasulcus lacks processes. The archeopyle is apical and is formed by the loss of all of the apical paraplates.
Dimensions: Holotype; cyst diameter 48 µm, length of processes 6-7 µm. Range; cyst diameter 43-53 µm, length of processes 5-9 µm, diameter of free operculum, 35 x 38 µm-41 x 39 µm. Number of specimens measured; 8.
Affinities:
Matsuoka and Bujak, 1988, p. 85: Systematophora cruta is characterized by the possession of well-developed penitabular complexes and processes that are mostly solid, wide, cylindrical to tubiform, with simple or recurved distal extremities. The species differs from other species of Systematophora because of its short processes.