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Exochosphaeridium solaster
From Fensome et al., 2019:
Exochosphaeridium solaster (Morgenroth, 1966a, p.25, pl.5, figs.8–9) Stover and Evitt, 1978, p.154. Holotype: Morgenroth, 1966a, pl.5, figs.8–9. Originally Cordosphaeridium, subsequently (and now) Exochosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.154). Age: Early Eocene.
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Original description: [Morgenroth, 1966a] (translated from German):
Cordosphaeridium solaster n. sp.
Plate 5 Fig. 8-9
Derivatio nominis: solaster lat.: The sun star.
Holotype: The specimen preserved in specimen HF 27 and illustrated on Plate 5 Fig. 8-9.
Paratypoids: H 16, H 32, H 57, 2F/12.
Locus typicus: Fehmarn, Katharinenhof.
Stratum typicalum: Lower Eocene (?2).
Diagnosis: A species of the genus Cordosphaeridium. Capsule covered with 30-40 stem-like processes that taper distally.
Description: The slightly ellipsoidal, sometimes spherical capsule is light brown in color and has a two-layered structure. The inner layer of the capsule wall consists of a smooth, approximately 1 μm thick membrane. Above this is the outer layer, consisting of fine fibers, from which 30-40 stem-like processes are formed, evenly distributed throughout the capsule. The thickness of the massive processes is variable. All taper gradually towards their ends. While the thinner processes usually end in simple points distally, the thicker ones give the impression of being truncated. In some, a fine fraying can be observed at the outermost tip. Several capsules contain a slightly ellipsoidal opening whose diameter varies between 22μ and 28μ. This is probably a pyloma.
Formally related species are not known.
Dimensions: Capsule length 46μ (42μ/53μ), capsule width 43μ (39μ/48μ), process length 17μ (14μ/25μ), pylome Ø 22μ-28μ (25 measurements). Number of specimens examined: 62.
Exochosphaeridium solaster (Morgenroth, 1966a, p.25, pl.5, figs.8–9) Stover and Evitt, 1978, p.154. Holotype: Morgenroth, 1966a, pl.5, figs.8–9. Originally Cordosphaeridium, subsequently (and now) Exochosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.154). Age: Early Eocene.
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Original description: [Morgenroth, 1966a] (translated from German):
Cordosphaeridium solaster n. sp.
Plate 5 Fig. 8-9
Derivatio nominis: solaster lat.: The sun star.
Holotype: The specimen preserved in specimen HF 27 and illustrated on Plate 5 Fig. 8-9.
Paratypoids: H 16, H 32, H 57, 2F/12.
Locus typicus: Fehmarn, Katharinenhof.
Stratum typicalum: Lower Eocene (?2).
Diagnosis: A species of the genus Cordosphaeridium. Capsule covered with 30-40 stem-like processes that taper distally.
Description: The slightly ellipsoidal, sometimes spherical capsule is light brown in color and has a two-layered structure. The inner layer of the capsule wall consists of a smooth, approximately 1 μm thick membrane. Above this is the outer layer, consisting of fine fibers, from which 30-40 stem-like processes are formed, evenly distributed throughout the capsule. The thickness of the massive processes is variable. All taper gradually towards their ends. While the thinner processes usually end in simple points distally, the thicker ones give the impression of being truncated. In some, a fine fraying can be observed at the outermost tip. Several capsules contain a slightly ellipsoidal opening whose diameter varies between 22μ and 28μ. This is probably a pyloma.
Formally related species are not known.
Dimensions: Capsule length 46μ (42μ/53μ), capsule width 43μ (39μ/48μ), process length 17μ (14μ/25μ), pylome Ø 22μ-28μ (25 measurements). Number of specimens examined: 62.