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Hystrichosphaeridium patulum
Hystrichosphaeridium patulum Davey and Williams, 1966
Holotype: Davey and Williams, 1966, pl.10, fig.5
Locus typicus: Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 60
Spherical to sub-spherical central body, not exceeding 25 µm in diameter, possessing a smooth thin wall and bearing two types of processes. Both types of same length and considerably expanded distally, one type much wider than the other. Distal margin entire and undulating. Length of processes one-quarter to one-half of the diameter of central body. Apical archaeopyle present.
Dimensions: holotype: diameter of central body 11.5 by 14.5 µm, length of
processes up to 5.5 µm, number of processes 25. Range: diameter of central body
11-19 µm, length of processes 4-9 µm.
Original description: Davey and Williams, 1966, p. 59
This species is characterized by its broad open processes, approximately 2 µm wide, and by the finer processes, up to 1 µm wide. The processes are tubiform with considerably expanded distal extremities measuring up to 7 µm across. The
number of processes can be up to 25. The apical archaeopyle has straight edges
obviously reflecting plate boundaries.
Affinities:
Davey and Williams, 1966, p. 60: The small size of this species and the two types of processes are characteristic. Its processes resemble shortened and sometimes widened processes of H. tubiferum, and the number present is also similar. Some relationship may perhaps be inferred between these two species.
Holotype: Davey and Williams, 1966, pl.10, fig.5
Locus typicus: Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 60
Spherical to sub-spherical central body, not exceeding 25 µm in diameter, possessing a smooth thin wall and bearing two types of processes. Both types of same length and considerably expanded distally, one type much wider than the other. Distal margin entire and undulating. Length of processes one-quarter to one-half of the diameter of central body. Apical archaeopyle present.
Dimensions: holotype: diameter of central body 11.5 by 14.5 µm, length of
processes up to 5.5 µm, number of processes 25. Range: diameter of central body
11-19 µm, length of processes 4-9 µm.
Original description: Davey and Williams, 1966, p. 59
This species is characterized by its broad open processes, approximately 2 µm wide, and by the finer processes, up to 1 µm wide. The processes are tubiform with considerably expanded distal extremities measuring up to 7 µm across. The
number of processes can be up to 25. The apical archaeopyle has straight edges
obviously reflecting plate boundaries.
Affinities:
Davey and Williams, 1966, p. 60: The small size of this species and the two types of processes are characteristic. Its processes resemble shortened and sometimes widened processes of H. tubiferum, and the number present is also similar. Some relationship may perhaps be inferred between these two species.