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Impagidinium veneziaense
Original description Iakovleva, 2025
Impagidinium veneziaense sp. nov.
Plate IX, 3, 5, 8, 11, 13–15.
2024 Ynezidinium brevisulcatum Iakovleva et al., p. 25, pl. 3, figs. 3, 6, 8, 10.
Etymology: Named for Venezia - the capital of the NE Italian region of Veneto, home to the Alano di Piave section, GSSP for the Bartonian/Priabonian boundary.
Type locality and horizon: Sample A6537, level 65,37 m, Alano di Piave section, Italy.
Holotype: Plate IX, 13–15; Sample A6537, slide 2, EF = V29–4.
Paratype: Plate IX, 3, 5, 8, 11; Sample A3480, slide 2, EF = H17–1.
Studied material: Alano di Piave section, Italy.
Stratigraphic horizon: Upper Bartonian-lower Priabonian. Future studies will further determine its entire stratigraphic range.
Diagnosis: A medium sized species of Impagidinium, pentagonal to oval in outline, with striated and microperforated septa, with irregular distal terminations.
Description:
Shape: Pentagonal to ovoidal.
Wall relationships: A smooth endophragm is overlain by a closely appressed scabrate to finely microgranulated periphragm giving rise to parasutural septa of intermediate height.
Wall features: Endophragm smooth, periphragm scabrate to finely microgranulated, with occasional minor folds and reticulations giving rise to parasutural septa of intermediate height. Septa striated and often microperforated septa, distally irregularly denticulate.
Processes: Absent.
Paratabulation: Indicated by parasutural features (septa); sexiform gonyaulacean; formula 3′, 5–6″, 5c, 5″’, 1p, 1″”.
Archeopyle: Precingular, type P (paraplate 3″), operculum free.
Dimensions: Holotype. 50 × 42 μm, septa 8–11 μm. Paratype. 52 × 43 μm, septa 8–11 μm. Total diameters central body range ∼ 57 × 41 μm (10 specimens), height of septa 7–12 μm.
Comparison: I. veneziaense sp. nov. differs from other species of Impagidinium by its pentagonal to ovoid overall shape, with the striated and microperforated septa, terminating in irregularly microdenticulations. It is in effect similar in shape as I. bellunoensis sp.nov. but differs by its distinctly smaller size range, thinner walled endophragm, and micro-striated character of the septa.
Impagidinium veneziaense sp. nov.
Plate IX, 3, 5, 8, 11, 13–15.
2024 Ynezidinium brevisulcatum Iakovleva et al., p. 25, pl. 3, figs. 3, 6, 8, 10.
Etymology: Named for Venezia - the capital of the NE Italian region of Veneto, home to the Alano di Piave section, GSSP for the Bartonian/Priabonian boundary.
Type locality and horizon: Sample A6537, level 65,37 m, Alano di Piave section, Italy.
Holotype: Plate IX, 13–15; Sample A6537, slide 2, EF = V29–4.
Paratype: Plate IX, 3, 5, 8, 11; Sample A3480, slide 2, EF = H17–1.
Studied material: Alano di Piave section, Italy.
Stratigraphic horizon: Upper Bartonian-lower Priabonian. Future studies will further determine its entire stratigraphic range.
Diagnosis: A medium sized species of Impagidinium, pentagonal to oval in outline, with striated and microperforated septa, with irregular distal terminations.
Description:
Shape: Pentagonal to ovoidal.
Wall relationships: A smooth endophragm is overlain by a closely appressed scabrate to finely microgranulated periphragm giving rise to parasutural septa of intermediate height.
Wall features: Endophragm smooth, periphragm scabrate to finely microgranulated, with occasional minor folds and reticulations giving rise to parasutural septa of intermediate height. Septa striated and often microperforated septa, distally irregularly denticulate.
Processes: Absent.
Paratabulation: Indicated by parasutural features (septa); sexiform gonyaulacean; formula 3′, 5–6″, 5c, 5″’, 1p, 1″”.
Archeopyle: Precingular, type P (paraplate 3″), operculum free.
Dimensions: Holotype. 50 × 42 μm, septa 8–11 μm. Paratype. 52 × 43 μm, septa 8–11 μm. Total diameters central body range ∼ 57 × 41 μm (10 specimens), height of septa 7–12 μm.
Comparison: I. veneziaense sp. nov. differs from other species of Impagidinium by its pentagonal to ovoid overall shape, with the striated and microperforated septa, terminating in irregularly microdenticulations. It is in effect similar in shape as I. bellunoensis sp.nov. but differs by its distinctly smaller size range, thinner walled endophragm, and micro-striated character of the septa.