Back
Hystrichokolpoma heroldiae
Plate 4, figs. A–L
Cyst Type 1 (Steeman et al., 2020) Plate 3, figs. 5–11.
Derivation of name. This is named in honor of the memory of Lotte Herold, a dear friend and an inspiration to the lead author in both work and personal life. Additionally, the name also relates to the Latin h¯er¯os, meaning a hero, here referring to the “superhero” cape-like feature this species has, which is a result of the distinct connection of the pre-and postcingular plates.
Diagnosis. A large, distinctive species of Hystrichokolpoma with interconnected pre- and postcingular processes,
overarching the paracingulum.
Holotype. Plate 3, figs. A–C, SDB 204.26m E8.
Paratypes. Paratype 1: Plate 4, fig. D, SDB 202.86m
C40.2. Paratype 2: Plate 4, figs. E–F, WL 108.69m N56.4.
Paratype 3: Plate 4, figs. G–I, MCBR1 13.92m K27.1.
Paratype 4: Plate 4, figs. J & K, MCBR1 12.77m D19.
Paratype 5: Plate 4, fig. L, BR 357.21m H31.3.
Material. South Dover Bridge (SDB) core, Talbot County, Maryland, USA.
Type locality and horizon. The South Dover Bridge (SDB) core, latest Paleocene, 204.05 m.
Age. Earliest Eocene.
Description. Shape: Body subspherical. Wall relationships:
Endophragm and periphragm appressed between processes.
Wall features: Parasutural areas between expanded processes well expressed by periphragmal thickenings. Wall smooth to finely striate with some individuals showing some granulation. Endophragm smooth 1–2 μm thick.
Processes: Large, intratabular processes, large closed cylindrical shape, showing longitudinal folds. The slender cingular processes can be faintly expressed, but, in most individuals, these processes have become part of the periphragm that connects the pre- and postcingular processes. Antapical process is not connected to the other processes.
Paratabulation: Antapical plate expressed by a separate process, and other tabulation is expressed by groups of processes.
Archeopyle: Apical, Type tA, operculum free.
Paracingulum: Can be indicated by slender cingular processes that are in most cases distally connected to the pre- and postcingular plates, which makes the paracingulum less visible.
Parasulcus: can be indicated by intratabular, distally connected processes.
Dimensions. Holotype: endocyst width 42 μm; pericyst width 68 μm, length antapical process 30 μm, width antapical process, 20 μm. Paratypes: endocyst width 33–47 μm; pericyst width 59–85 μm, length antapical process 16–30 μm, width antapical process, 14–21 μm (n D 6).
Stratigraphic range/occurrence. Latest Paleocene–earliest Eocene.
Remarks. This species of Hystrichokolpoma differs from any other species in having distinct connected pre- and postcingular processes. Steeman et al. (2020) recognized this taxon in the upper Paleocene–lower Eocene in Angola and called it Cyst Type 1.
Cyst Type 1 (Steeman et al., 2020) Plate 3, figs. 5–11.
Derivation of name. This is named in honor of the memory of Lotte Herold, a dear friend and an inspiration to the lead author in both work and personal life. Additionally, the name also relates to the Latin h¯er¯os, meaning a hero, here referring to the “superhero” cape-like feature this species has, which is a result of the distinct connection of the pre-and postcingular plates.
Diagnosis. A large, distinctive species of Hystrichokolpoma with interconnected pre- and postcingular processes,
overarching the paracingulum.
Holotype. Plate 3, figs. A–C, SDB 204.26m E8.
Paratypes. Paratype 1: Plate 4, fig. D, SDB 202.86m
C40.2. Paratype 2: Plate 4, figs. E–F, WL 108.69m N56.4.
Paratype 3: Plate 4, figs. G–I, MCBR1 13.92m K27.1.
Paratype 4: Plate 4, figs. J & K, MCBR1 12.77m D19.
Paratype 5: Plate 4, fig. L, BR 357.21m H31.3.
Material. South Dover Bridge (SDB) core, Talbot County, Maryland, USA.
Type locality and horizon. The South Dover Bridge (SDB) core, latest Paleocene, 204.05 m.
Age. Earliest Eocene.
Description. Shape: Body subspherical. Wall relationships:
Endophragm and periphragm appressed between processes.
Wall features: Parasutural areas between expanded processes well expressed by periphragmal thickenings. Wall smooth to finely striate with some individuals showing some granulation. Endophragm smooth 1–2 μm thick.
Processes: Large, intratabular processes, large closed cylindrical shape, showing longitudinal folds. The slender cingular processes can be faintly expressed, but, in most individuals, these processes have become part of the periphragm that connects the pre- and postcingular processes. Antapical process is not connected to the other processes.
Paratabulation: Antapical plate expressed by a separate process, and other tabulation is expressed by groups of processes.
Archeopyle: Apical, Type tA, operculum free.
Paracingulum: Can be indicated by slender cingular processes that are in most cases distally connected to the pre- and postcingular plates, which makes the paracingulum less visible.
Parasulcus: can be indicated by intratabular, distally connected processes.
Dimensions. Holotype: endocyst width 42 μm; pericyst width 68 μm, length antapical process 30 μm, width antapical process, 20 μm. Paratypes: endocyst width 33–47 μm; pericyst width 59–85 μm, length antapical process 16–30 μm, width antapical process, 14–21 μm (n D 6).
Stratigraphic range/occurrence. Latest Paleocene–earliest Eocene.
Remarks. This species of Hystrichokolpoma differs from any other species in having distinct connected pre- and postcingular processes. Steeman et al. (2020) recognized this taxon in the upper Paleocene–lower Eocene in Angola and called it Cyst Type 1.