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Rhenopyrgus viviani

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Journal Article

New rhenopyrgid edrioasteroids (Echinodermata) and their implications for taxonomy, functional morphology, and paleoecology

Timothy A. M. Ewin, Markus Martin, Phillip Isotalo, Samuel Zamora
Published: 01 January 2020
Journal of Paleontology (2020) 94 (1): 115–130.
DOI: https://doi.org/10.1017/jpa.2019.65
..., along with a review of described taxa, has revealed broader structural diversity in the oral surface and enabled a re-evaluation of rhenopyrgid functional morphology and paleoecology. The floor plates in Rhenopyrgus viviani n. sp., R . coronaeformis Rievers, 1961 and, R . flos Klug et al., 2008 are well...
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Rhenopyrgus viviani n. sp. Silurian (lower Telychian), Jupiter Formation, Jupiter River, Anticosti Island, Canada. (1) Camera lucida of lateral CD ambulacral of holotype of Rhenopyrgus viviani n. sp. (EE 16642); note periproct formed of small lath-shaped plates adjacent to edge of oral plate; also note lack of floor plates exposed along adambulacral margin of oral plate; (2) camera lucida view of oral surface of paratype MPEP 1126.1; note groove and ridge arrangement along adambulacral margin of oral plate that accommodated and held in place cover plates; also note ridged surface of fused floor plates, which may have accommodated tube feet.

Rhenopyrgus viviani n. sp. Silurian (lower Telychian), Jupiter Formation, ...

Published: 01 January 2020
Figure 4. Rhenopyrgus viviani n. sp. Silurian (lower Telychian), Jupiter Formation, Jupiter River, Anticosti Island, Canada. ( 1 ) Camera lucida of lateral CD ambulacral of holotype of Rhenopyrgus viviani n. sp. (EE 16642); note periproct formed of small lath-shaped plates adjacent to edge
Image
Rhenopyrgus viviani n. sp. from Jupiter Formation, Telychian of Anticosti Island, Québec, Canada. (1–9) From Cybéle Member, Rock Pool Ledge site on Jupiter River (1–3) (paratype MPEP 1126.1); (1) lateral view of entire specimen (note it is preserved perpendicular to bedding with flattened oral surface but undisturbed pyrgate zone); (2) detail of oral surface; white arrows point to ridges on adambulacral margin of the oral ossicles, which accommodated cover plates; black arrow points to the ridged ambulacral floor that is presumably an extension of the interadial oral ossicle (coated with ammonium chloride); (3) oral surface without ammonium chloride; again, black arrow points to ridged ambulacral floor; (4) oral view of cover plates showing vestige of 2-1-2 ambulacral arrangement (paratype EE 15752); (5) lateral view, note lack of any floor plate sutures along adambulacral margin of oral plates (paratype EE 15753). (6–8) Holotype (EE 16642); (6) note changing morphology of pyrgate zone ossicles; (7) detail of oral surface and sub-oral constriction; black arrow points to anal pyramid composed of rod-like ossicles; white arrow points to triangular cross section of cover plates; (8) holotype slab showing two individuals (holotype on right). (9) Lateral view with a well-preserved suboral constriction; note a change in morphology of pyrgate zone plates (paratype EE 15754). (10) From Pavillon Member at Rivière aux Plats; distal pyrgate zone and bulbous coriaceous sack-like holdfast comprised of small granular plates (paratype EE 15756). Abbreviations: CL = collar plates, CP = cover plates, O = oral plate. All scale bars represent 1 mm.

Rhenopyrgus viviani n. sp. from Jupiter Formation, Telychian of Anticosti ...

Published: 01 January 2020
Figure 2. Rhenopyrgus viviani n. sp. from Jupiter Formation, Telychian of Anticosti Island, Québec, Canada. ( 1–9 ) From Cybéle Member, Rock Pool Ledge site on Jupiter River ( 1–3 ) (paratype MPEP 1126.1); ( 1 ) lateral view of entire specimen (note it is preserved perpendicular to bedding
Image
Idealized reconstruction of Rhenopyrgus viviani n. sp. Silurian (lower Telychian), Jupiter Formation, Jupiter River, Anticosti Island, Canada. Note individuals with extended and contracted suboral constrictions and with only the coriaceous sac and very distal part of the pyrgate zone buried in the substrate.

Idealized reconstruction of Rhenopyrgus viviani n. sp. Silurian (lower Te...

Published: 01 January 2020
Figure 5. Idealized reconstruction of Rhenopyrgus viviani n. sp. Silurian (lower Telychian), Jupiter Formation, Jupiter River, Anticosti Island, Canada. Note individuals with extended and contracted suboral constrictions and with only the coriaceous sac and very distal part of the pyrgate zone