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Chytroeisphaeridia hadra
From Fensome et al., 2019:
Chytroeisphaeridia hadra Fensome et al., 2016b, p.36, pl.4, figs.17–18. Holotype: Fensome et al., 2016b, pl.4, fig.18. Age: Late Cretaceous (caved).
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Original description Fensome et al., 2016b:
Holotype. Plate 4, fig. 18 from a cuttings sample at 3120–3140 m in Roberval K-92, GSC type collection no. 137902, sample P17728, slide 01, co-ordinates 19.5 × 109.8, England Finder U40/1. Overall length 79 μm, width 81 μm; wall thickness 5 μm, archaeopyle length 37 μm, width 33 μm. The age determined for the sample from which the holotype was recovered is Late Cretaceous (the specimen is caved).
Etymology. The epithet is from the Greek hadros meaning well-developed, bulky, stout, strong, great, in reference to the thick, sturdy wall.
Diagnosis. A species of Chytroeisphaeridia with a thick wall that has a subdued rugulate, sometimes lightly striated surface. The archaeopyle is large, apparently resulting from the loss of the 3´´ plate only.
Size. Overall length 69–82 μm; width 64–81 μm. Six specimens measured.
Age. LO: Bartonian.
Remarks. Some specimens of Chytroeisphaeridia hadra have parallel striations on the wall but these are irregular and discontinuous. The archaeopyle is large, suggesting that more than a single plate may be involved.
Chytroeisphaeridia hadra Fensome et al., 2016b, p.36, pl.4, figs.17–18. Holotype: Fensome et al., 2016b, pl.4, fig.18. Age: Late Cretaceous (caved).
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Original description Fensome et al., 2016b:
Holotype. Plate 4, fig. 18 from a cuttings sample at 3120–3140 m in Roberval K-92, GSC type collection no. 137902, sample P17728, slide 01, co-ordinates 19.5 × 109.8, England Finder U40/1. Overall length 79 μm, width 81 μm; wall thickness 5 μm, archaeopyle length 37 μm, width 33 μm. The age determined for the sample from which the holotype was recovered is Late Cretaceous (the specimen is caved).
Etymology. The epithet is from the Greek hadros meaning well-developed, bulky, stout, strong, great, in reference to the thick, sturdy wall.
Diagnosis. A species of Chytroeisphaeridia with a thick wall that has a subdued rugulate, sometimes lightly striated surface. The archaeopyle is large, apparently resulting from the loss of the 3´´ plate only.
Size. Overall length 69–82 μm; width 64–81 μm. Six specimens measured.
Age. LO: Bartonian.
Remarks. Some specimens of Chytroeisphaeridia hadra have parallel striations on the wall but these are irregular and discontinuous. The archaeopyle is large, suggesting that more than a single plate may be involved.