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Pilosidinium microcystum
Pilosidinium microcystum (Bujak in Bujak et al., 1980, p.88,90, pl.22, figs.2–5) Courtinat in Fauconnier and Masure 2004, p.448. Holotype: Bujak et al., 1980, pl.22, figs.2–3; Fauconnier and Masure, 2004, pl.64, figs.4–5. Originally Tenua Eisenack, subsequently Cleistosphaeridium, thirdly Sentusidinium, fourthly (and now) Pilosidinium. Age: middle Eocene (see Aubry, 1986).
Original diagnosis: Bujak in Bujak et al., 1980, p.88-89: Tenua microcysta
Autocyst ovoidal, sometimes with two weakly developed antapical lobes. Autophragm smooth to chagrinate with abundant processes. The processes are nontabular and are of constant length on a specimen, but vary in length intraspecifically. The processes are mostly expanded proximally, hollow, and are distally capitate or bifid. Occasional processes are solid or simple. The archaeopyle is apical, tetratabular, and has well-developed accessory archaeopyle sutures between the precingular paraplates. The operculum is detached.
Dimensions. Autocyst length (without operculum) = 28-36 µm, breadth = 24-34 µm. Process length is up to 6 µm.
Original diagnosis: Bujak in Bujak et al., 1980, p.88-89: Tenua microcysta
Autocyst ovoidal, sometimes with two weakly developed antapical lobes. Autophragm smooth to chagrinate with abundant processes. The processes are nontabular and are of constant length on a specimen, but vary in length intraspecifically. The processes are mostly expanded proximally, hollow, and are distally capitate or bifid. Occasional processes are solid or simple. The archaeopyle is apical, tetratabular, and has well-developed accessory archaeopyle sutures between the precingular paraplates. The operculum is detached.
Dimensions. Autocyst length (without operculum) = 28-36 µm, breadth = 24-34 µm. Process length is up to 6 µm.