Hystrichosphaeridium diktyoplokum subsp. latum

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"subsp. latum" Klumpp, 1953, p.392, pl.18, figs.8-10.  Emendation: Sarjeant, 1981, p.106-107, as Plethysyrinx lata - however, see Lentin and Williams (1985, p.72).  Holotype: Klumpp, 1953, pl.18, figs.8-9.  NOW Cordosphaeridium latum.  Originally Hystrichosphaeridium diktyoplokum subsp. latum, subsequently Cordosphaeridium diktyoplokum subsp. latum, thirdly Areosphaeridium diktyoplokum subsp. latum, fourthly Plethysyrinx lata, fifthly (and now) Cordosphaeridium latum.  Age: Eocene. Parent: Hystrichosphaeridium diktyoplokum