Cyathotheca suecica and its bearing on the evolution of the Edrioasteroidea

Bockelie, Johan Fredrik; Paul, C. R. C.

doi:10.1111/j.1502-3931.1983.tb01152.x

Cited by 10 publications

(8 citation statements)

References 3 publications

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“…The pedunculate zone plating is fused into a turreted structure that attaches to the substrate via toelike extensions (Bell, 1982;Bockelie and Paul, 1983). There is no hint of the attachment disk because of extensive plate fusion.…”

Section: Morphologymentioning

confidence: 97%

New edrioasterine and astrocystitid (Echinodermata: Edrioasteroidea) from the Ninemile Shale (Lower Ordovician), central Nevada

Sprinkle

Sumrall²

2015

J. Paleontol.

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The new edrioasterine Pseudedriophus guensburgi n. gen. n. sp., is described from the Lower Ordovician Ninemile Shale of central Nevada based on three complete to partial small specimens, a well-preserved large ambulacrum, and an isolated ambulacral floor plate. The weathered-out holotype of this edrioasterine exposes the bottom surface of the theca that bears an aboral collar, peduncular stalk, and attachment disk, features that are poorly known in this clade. These specimens were found with a single specimen of a new edrioblastoid, Porosublastus inexpectus n. gen. n. sp., only the second edrioblastoid ever found in the Early Ordovician. Some of the ambulacral cover plates are stripped off one of the ambulacal grooves, revealing new information about how the ambulacra are built in this rare group of bud-shaped edrioasteroids.

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Section: Morphologymentioning

confidence: 97%

New edrioasterine and astrocystitid (Echinodermata: Edrioasteroidea) from the Ninemile Shale (Lower Ordovician), central Nevada

Sprinkle

Sumrall²

2015

J. Paleontol.

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“…specimens (Figs. 2.2, 3, 6-7 and 9) as well as in cyathocystids (Bockelie and Paul, 1983). The fan-like opening of the ambulacra of R. coronaeformis were suggested by Bartels et al (1998) as evidence that the cover plates opened simultaneously along the midline of the ambulacra via articulation along the aboral margin of the oral plates, in a manner identical to that proposed by Bockelie and Paul (1983) for cyathocystids.…”

Section: Discussionmentioning

confidence: 67%

“…2.2, 3, 6-7 and 9) as well as in cyathocystids (Bockelie and Paul, 1983). The fan-like opening of the ambulacra of R. coronaeformis were suggested by Bartels et al (1998) as evidence that the cover plates opened simultaneously along the midline of the ambulacra via articulation along the aboral margin of the oral plates, in a manner identical to that proposed by Bockelie and Paul (1983) for cyathocystids. However, we prefer to interpret the cover plates being able to open individually, as well as simultaneously, by articulation along the adambulacral margin of the oral plates owing to the F o r R e v i e w O n l y cross sectional morphology of the cover plates and that each was inserted individually within groves on oral plate margins in Rhenopyrgus.…”

Section: Discussionmentioning

confidence: 67%

“…specimens (Fig. 2.2, 2.3, 2.6, 2.7, 2.9), as well as in cyathocystids (Bockelie and Paul, 1983). The fan-like opening of the ambulacra of R .…”

Section: Discussionmentioning

confidence: 94%

“…This is significant as it suggests the location of other structures, particularly the hydropore, which is usually located either within the C-D interradial oral plate or along its distal margin (Bell, 1976). In Cyathotheca, the hydropore has been tentatively located within the interradial oral ("deltoid") plate, although this is only identified in one specimen (Bockelie and Paul, 1983). Unfortunately, the periproct obscures much of the central and distal part of the C-D interradial oral plate and its margin in the R. viviani (Fig 2.7).…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2019

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Rhenopyrgids are rare, turreted edrioasterid edrioasteroids from the lower Paleozoic with a distinctive and apparently conservative morphology. However, new, well-preserved rhenopyrgid edrioasteroid material from Canada, 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 fused to each other and the interradial oral plate and lack obvious sutures, thereby forming a single compound interradial plate. This differs from other rhenopyrgids where sutures are more apparent. Such fused oral surface construction is only otherwise seen in some derived edrioblastoids and in the cyathocystids, suggesting homoplasy.Our analysis further suggests that the suboral constriction could contract but the flexible pyrgate zone could not. Thus, specimens apparently lacking a sub-oral constriction should not necessarily be placed in separate genera within the Rhenopyrgidae. It also supports rhenopyrgids as epifaunal mud-stickers with only the bulbous, textured, entire holdfasts (coriaceous sacs) anchored within the substrate rather than as burrow dwellers or encrusters.Rhenopyrgus viviani n. sp. is described from the Telychian (lower Silurian) Jupiter Formation of Anticosti Island, Québec, Canada and is differentiated by a high degree of morphological variability of pedunculate plates, broader oral plates, and narrower distal ambulacral zones. Specimens lacking or with obscured diagnostic plates from the Ordovician of Montagne Noire, France, and the Ordovician and Silurian of Girvan, Scotland are also described.UUID: http://zoobank.org/7f81d67f-4155-4719-8a45-b278ad70739d

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Professor Christopher R. C. Paul

Donovan

2005

Geological Journal

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Cyathotheca suecica and its bearing on the evolution of the Edrioasteroidea

Cited by 10 publications

References 3 publications

New edrioasterine and astrocystitid (Echinodermata: Edrioasteroidea) from the Ninemile Shale (Lower Ordovician), central Nevada

New edrioasterine and astrocystitid (Echinodermata: Edrioasteroidea) from the Ninemile Shale (Lower Ordovician), central Nevada

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

Professor Christopher R. C. Paul

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