<i>Giganticlavus,</i> a new genus of Pennsylvanian edrioasteroid from North America

Sumrall, Colin D.; Bowsher, Arthur L.

doi:10.1017/s0022336000038683

Cited by 22 publications

(16 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies on edrioasteroids from North America constitute most of the work since 1990 (e.g. , Meyer 1990;Sumrall 1992Sumrall , 1996bGuensburg and Sprinkle 1994;Sumrall and Bowsher 1996), but some descriptions of these fossils from the Indo-Pacific (e.g., Holloway 1992) and Europe (e.g., Grigo 1995) have also appeared.…”

Section: The Record: Fossil Finds From New Spaces and Timesmentioning

confidence: 99%

Not all written in stone: interdisciplinary syntheses in echinoderm paleontology

Mooi¹

2001

Can. J. Zool.

View full text Add to dashboard Cite

The fossil record of the Echinodermata is relatively complete, and is represented by specimens retaining an abundance of features comparable to that found in extant forms. This yields a half-billion-year record of evolutionary novelties unmatched in any other major group, making the Echinodermata a primary target for studies of biological change. Not all of this change can be understood by studying the rocks alone, leading to synthetic research programs. Study of literature from the past 20 years indicates that over 1400 papers on echinoderm paleontology appeared in that time, and that overall productivity has remained almost constant. Analysis of papers appearing since 1990 shows that research is driven by new finds including, but not restricted to, possible Precambrian echinoderms, bizarre new edrioasteroids, early crinoids, exquisitely preserved homalozoans, echinoids at the K-T boundary, and Antarctic echinoids, stelleroids, and crinoids. New interpretations of echinoderm body wall homologies, broad-scale syntheses of embryological information, the study of developmental trajectories through molecular markers, and the large-scale ecological and phenotypic shifts being explored through morphometry and analyses of large data sets are integrated with study of the fossils themselves. Therefore, recent advances reveal a remarkable and continuing synergistic expansion in our understanding of echinoderm evolutionary history.Résumé : Les fossiles d'échinodermes sont bien connus et les spécimens qui les représentent possèdent plusieurs caractères qui prévalent encore chez les formes modernes. On se retrouve donc devant un inventaire de caractères évolu-tifs inédits étalé sur un demi-milliard d'années, inégalé parmi les autres groupes principaux d'animaux, ce qui fait des échinodermes le groupe cible idéal pour l'étude des changements biologiques. Ces changements ne peuvent être compris au seul examen des roches, d'où la création de programmes de recherche de synthèse. L'examen de la littérature des derniers 20 ans indique que plus de 1400 articles sur la paléontologie des échinodermes ont été publiés durant cette période et que la productivité globale est demeurée presque constante. L'analyse des articles publiés depuis 1990 montre que la recherche est stimulée par les nouvelles découvertes, entre autres, de la présence d'échinodermes au Pré-cambrien, de nouveaux édrioastéroïdes bizarres, de crinoïdes anciens, d'homalozoaires remarquablement conservés, d'échinoïdes à la limite Crétacé-Tertiaire et d'échinoïdes, stelléroïdes et crinoïdes de l'Antarctique. J'ai intégré aux fossiles eux-mêmes de nouvelles interprétations des homologies de la paroi du corps des échinodermes, des synthèses sur une grande échelle des données embryologiques, l'étude des trajectoires du développement au moyen de marqueurs moléculaires et les modifications écologiques et phénotypiques globales qui sont explorées par la morphométrie et par l'analyse de grands ensembles de données. Ainsi, les progrès récents mettent en lumière une expansion syne...

show abstract

Section: The Record: Fossil Finds From New Spaces and Timesmentioning

confidence: 99%

Not all written in stone: interdisciplinary syntheses in echinoderm paleontology

Mooi¹

2001

Can. J. Zool.

View full text Add to dashboard Cite

show abstract

“…A (Late Ordovician), Euryeschatia reboulorum Sumrall and Zamora (Late Ordovician) , Multiplexidiscus mckenziensis Sumrall, Brett, and McKinney (Middle Silurian) , Streptaster nodosis Sumrall and Zamora (Late Ordovician) , Giganticlavus bennisoni Sumrall and Bowsher (Early Pennsylvanian), and T. kypsi Sumrall (Early Mississippian). Sources for these specimens were (Sumrall & Bowsher 1996; Sumrall & Gahn 2006; Sumrall & Zamora, in press; Sumrall 2001, in press; Sumrall et al. 2000, 2006a,b, Sumrall et al.…”

Section: Methods and Resultsmentioning

confidence: 99%

“…The curvature of the ambulacra has generally been attributed to positive allometry in response to surface area volume problems encountered with increase overall size (Sumrall & Bowsher 1996; Sumrall et al. 2006a).…”

Section: Edrioasteroid Growth Strategiesmentioning

confidence: 99%

“…Where known in Giganticlavus Sumrall and Bowsher and the distantly related Streptaster vorticellatus Hall, the distal portions of the ambulacra are evenly spaced with narrow regions of interambulacra between adjacent ambulacra. Spiralling can only be effectively accomplished if all of the ambulacra curve in the same direction, otherwise ambulacra will cross (Sumrall & Bowsher 1996).…”

Section: Edrioasteroid Growth Strategiesmentioning

confidence: 99%

“…Plesiomorphically, the ambulacra are curved and confined to the oral surface. In descendant lineages, however, different growth strategies were employed in an apparent attempt to lengthen the ambulacra to compensate for surface area to volume problems (Sumrall & Bowsher 1996; Sumrall 2001; Sumrall & Gahn 2006; Sumrall et al. 2006a) .…”

mentioning

confidence: 99%

See 2 more Smart Citations

Ambulacral growth allometry in edrioasteroids: functional surface-volume change in ontogeny and phylogeny

McKinney

Sumrall

2011

LET

Self Cite

View full text Add to dashboard Cite

Most organisms do not maintain geometric similarity as they grow, in large part because of surface-volume interactions. Because respiratory and food-acquiring organs are dependent on surface area, which increases more slowly than volume, organisms have evolved many strategies to increase the efficiency of, and ⁄ or the functional surface areas of these organs. Here, we report some preliminary results comparing area of the feeding apparatus (ambulacra) versus the volume of the theca for a suite of isorophid edrioasteroid species at various ontogenetic sizes. Regression of log (ambulacral area) on log (thecal volume) indicates a strongly constrained allometric pattern whereby the ontogenies of all measured species fall on or near the same line (r 2 = 0.962, n = 55), with a slope (k) = 0.654 (± 0.018). This slope and associated 0.05 standard error (0.618-0.690) is within the bounds of that expected from increasing surface area to keep pace with the metabolic demands of increasing thecal size. This allometric value is also comparable to the size scaling of metabolism and respiratory and feeding surfaces in many living and a few fossil invertebrates (k $ 0.5-0.9). The edrioasteroid species analysed show a very wide variety of changes in ambulacral length, width and sinuosity, documenting many different patterns for achieving the same goal of increasing surface area to keep pace with volume increase. There is no evidence of increasing feeding efficiency. h Edrioasteroid, allometry, ambulacrum, surface-volume, echinoderm.

show abstract

A new large edrioasteroid from the Seifen Formation of the Westerwald, Rhenish Massif (Lower Devonian, Germany)

Müller¹,

Hahn²

2020

PalZ

View full text Add to dashboard Cite

Giganticlavus, a new genus of Pennsylvanian edrioasteroid from North America

Cited by 22 publications

References 3 publications

Not all written in stone: interdisciplinary syntheses in echinoderm paleontology

Not all written in stone: interdisciplinary syntheses in echinoderm paleontology

Ambulacral growth allometry in edrioasteroids: functional surface-volume change in ontogeny and phylogeny

A new large edrioasteroid from the Seifen Formation of the Westerwald, Rhenish Massif (Lower Devonian, Germany)

Contact Info

Product

Resources

About