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Tanyosphaeridium fusiforme
Tanyosphaeridium fusiforme Matsuoka, 1974
Now Distatodinium. Originally Tanyosphaeridium, subsequently (and now) Distatodinium.
Holotype: Matsuoka, 1974, pl.46, fig.4; Fauconnier and Masure, 2004, pl.22, fig.7
Locus typicus: Fujiwara-cho, Nara City, Nara Prefecture
Stratum typicum: Early-middle Miocene
Original diagnosis: Matsuoka, 1974, p.332
Very elongate central body with irregularly reticulate inner wall surface. Processes tubiform, open distal parts with aculeate or orthogonal margin, and similar length. The number of processes about fifteen. Conceivable tabulation 3", 6", ?g, 6""" and 2-3"""".
Description: Matsuoka, 1974, p.332-333
The present specimens have a very elongate central body with irregularly reticulate inner wall surface. Processes are composed of thin smooth outer wall and have broad bases and taper tips. The processes are distally aculeate or orthogonal with irregularly long tips. The bases of these processes are quadrate, but always not clear. The number of these processes is about fifteen. In the specimens attached the operculum, three hollow and tubiform processes are observed in the apical area. The six processes corresponding to each precingular plates are around the apical archeopyle. Any ornamentation is not observed in the cingular and sulcal regions. But relatively broad span between precingular and postcingular processes may reflect the cingular region. The postcingular region has six tubiform processes, and each one indicates to each original postcingular plate. The antapical area has three or sometimes two processes. Its archeopyle is an apical type with several archeopyle sutures.
Affinities:
Matsuoka, 1974, p.333: The present new species of Tanyosphaeridium resembles to T . paradoxum (Brosius) shown by Gocht (1969) in the shape of the central body, but differs from the latter species in the number of processes and the nature of these distal parts. Also, this species has a smaller number of processes than that of the other species described by Davey and Williams, 1966, such as T. variecalamum and T. regulare.
Dimensions: Holotype- Length of central body 50 µm, width of central body 24 µm, length of processes 14-16 µm, diameter of archeopyle ca. 20 µm. Ranging dimensions: Length of central body 48-60 µm, width of central body 25-30 µm, length of processes 12-24 µm, diameter of archeopyle ca. 20 - 26 µm.
Now Distatodinium. Originally Tanyosphaeridium, subsequently (and now) Distatodinium.
Holotype: Matsuoka, 1974, pl.46, fig.4; Fauconnier and Masure, 2004, pl.22, fig.7
Locus typicus: Fujiwara-cho, Nara City, Nara Prefecture
Stratum typicum: Early-middle Miocene
Original diagnosis: Matsuoka, 1974, p.332
Very elongate central body with irregularly reticulate inner wall surface. Processes tubiform, open distal parts with aculeate or orthogonal margin, and similar length. The number of processes about fifteen. Conceivable tabulation 3", 6", ?g, 6""" and 2-3"""".
Description: Matsuoka, 1974, p.332-333
The present specimens have a very elongate central body with irregularly reticulate inner wall surface. Processes are composed of thin smooth outer wall and have broad bases and taper tips. The processes are distally aculeate or orthogonal with irregularly long tips. The bases of these processes are quadrate, but always not clear. The number of these processes is about fifteen. In the specimens attached the operculum, three hollow and tubiform processes are observed in the apical area. The six processes corresponding to each precingular plates are around the apical archeopyle. Any ornamentation is not observed in the cingular and sulcal regions. But relatively broad span between precingular and postcingular processes may reflect the cingular region. The postcingular region has six tubiform processes, and each one indicates to each original postcingular plate. The antapical area has three or sometimes two processes. Its archeopyle is an apical type with several archeopyle sutures.
Affinities:
Matsuoka, 1974, p.333: The present new species of Tanyosphaeridium resembles to T . paradoxum (Brosius) shown by Gocht (1969) in the shape of the central body, but differs from the latter species in the number of processes and the nature of these distal parts. Also, this species has a smaller number of processes than that of the other species described by Davey and Williams, 1966, such as T. variecalamum and T. regulare.
Dimensions: Holotype- Length of central body 50 µm, width of central body 24 µm, length of processes 14-16 µm, diameter of archeopyle ca. 20 µm. Ranging dimensions: Length of central body 48-60 µm, width of central body 25-30 µm, length of processes 12-24 µm, diameter of archeopyle ca. 20 - 26 µm.