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Eumorphocystis

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Journal Article

Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms – ERRATUM

Thomas E. Guensburg, James Sprinkle, Rich Mooi, Bertrand Lefebvre
Published: 01 March 2021
Journal of Paleontology (2021) 95 (2): 426.
DOI: https://doi.org/10.1017/jpa.2021.12
...? -011- 13–0 -0-0- ----- ----- 3110? 1--- Hemicosmites pocillum 1111? -01?- 33–0 -0-0- ----- ----- 31101 1--- Stephanocrinus gemmiformis 1111? -011- 15–0 -0-0- ----- ----- 31100 1--- Eumorphocystis multiporata 11111...
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Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms

Thomas E. Guensburg, James Sprinkle, Rich Mooi, Bertrand Lefebvre
Published: 01 March 2021
Journal of Paleontology (2021) 95 (2): 327–343.
DOI: https://doi.org/10.1017/jpa.2020.84
...Thomas E. Guensburg; James Sprinkle; Rich Mooi; Bertrand Lefebvre Abstract Twelve specimens of Eumorphocystis Branson and Peck, 1940 provide the basis for new findings and a more informed assessment of whether this blastozoan (a group including eocrinoids, blastoids, diploporites, rhombiferans...
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<span class="search-highlight">Eumorphocystis</span> multiporata Branson and Peck, 1940 , partial reconstructio...

Eumorphocystis multiporata Branson and Peck, 1940 , partial reconstructio...

Published: 01 March 2021
Figure 1. Eumorphocystis multiporata Branson and Peck, 1940 , partial reconstruction, included for orientation of subsequent images; from Parsley ( 1982 ), reproduced by permission, The Paleontological Institute, University of Kansas, Lawrence.
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<span class="search-highlight">Eumorphocystis</span> multiporata Branson and Peck, 1940 , a diploporan blastozo...

Eumorphocystis multiporata Branson and Peck, 1940 , a diploporan blastozo...

Published: 01 March 2020
Figure 9. Eumorphocystis multiporata Branson and Peck, 1940 , a diploporan blastozoan; OU 9048, view of E ray, broken surface adjacent to the thecal wall, no opening to the thecal interior.
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<span class="search-highlight">Eumorphocystis</span> specimens studied, with sizes of specimens, and comments on...

Eumorphocystis specimens studied, with sizes of specimens, and comments on...

Published: 01 March 2021
Table 1. Eumorphocystis specimens studied, with sizes of specimens, and comments on image orientations used in this study. Specimen Thecal height (mm) Images used OU holotype cast 3123 50 not illustrated OU 9047 9.5 A ray second broken floor plate left, first on right
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<span class="search-highlight">Eumorphocystis</span> multiporata Branson and Peck, 1940 , NPL 93144, large part...

Eumorphocystis multiporata Branson and Peck, 1940 , NPL 93144, large part...

Published: 01 March 2021
Figure 2. Eumorphocystis multiporata Branson and Peck, 1940 , NPL 93144, large partial theca with two adjacent pseudo-arm stubs, one longer, one shorter: ( 1 ) coated oral view showing long arm stub (left), pseudo-arm cover plates, and brachiole facet (just above and to right and above scale
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<span class="search-highlight">Eumorphocystis</span> multiporata Branson and Peck, 1940 , specimens showing pse...

Eumorphocystis multiporata Branson and Peck, 1940 , specimens showing pse...

Published: 01 March 2021
Figure 3. Eumorphocystis multiporata Branson and Peck, 1940 , specimens showing pseudo-arm canal and adjacent morphology: ( 1, 2 ) OU 9049: ( 1 ) oral view of theca, with plates partly obscured by calcitic overgrowths, theca broken through C ambulacrum; arrow pointing to view of enlargement
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<span class="search-highlight">Eumorphocystis</span> multiporata Branson and Peck, 1940 , showing pseudo-arms a...

Eumorphocystis multiporata Branson and Peck, 1940 , showing pseudo-arms a...

Published: 01 March 2021
Figure 4. Eumorphocystis multiporata Branson and Peck, 1940 , showing pseudo-arms and stem facet: ( 1–3 ) specimens showing small canals near thecal juncture: ( 1 ) OU 9048, E ray, canal small, assumed to be spar-filled; ( 2 ) OU 238159, small individual lacking buttress plates (see Fig. 6.1
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Color-coded feeding appendage cross sections: (1–4) <span class="search-highlight">Eumorphocystis</span> multip...

Color-coded feeding appendage cross sections: (1–4) Eumorphocystis multip...

Published: 01 March 2021
Figure 6. Color-coded feeding appendage cross sections: (1–4) Eumorphocystis multiporata Branson and Peck, 1940 (see Figs. 2.2 , 2.3 , 4.2 and 4.3 ); ( 1–3 ) ontogenetic series (see Table 1 ), pseudo-arms broken off at theca-arm juncture, the second floor plate distal to the orals
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Strict consensus of the 18 most parsimonious trees with a length of 99 step...

Strict consensus of the 18 most parsimonious trees with a length of 99 step...

Published: 01 July 2019
that the original classification of Sphaeronitida is a natural evolutionary group, whereas Glyptosphaeritida is polyphyletic because paracrinoid Canadocystis is rooted within taxa traditionally grouped with the glyptosphaeritids and Eumorphocystis shares a sister taxon relationship with crinoid Hybocrinus
Journal Article

The phylogeny of the Diploporita: a polyphyletic assemblage of blastozoan echinoderms

Sarah L. Sheffield, Colin D. Sumrall
Published: 01 July 2019
Journal of Paleontology (2019) 93 (4): 740–752.
DOI: https://doi.org/10.1017/jpa.2019.2
... that the original classification of Sphaeronitida is a natural evolutionary group, whereas Glyptosphaeritida is polyphyletic because paracrinoid Canadocystis is rooted within taxa traditionally grouped with the glyptosphaeritids and Eumorphocystis shares a sister taxon relationship with crinoid Hybocrinus...
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Athenacrinus n. gen. and other early echinoderm taxa inform crinoid origin and arm evolution

Thomas E. Guensburg, James Sprinkle, Rich Mooi, Bertrand Lefebvre, Bruno David, Michel Roux, Kraig Derstler
Published: 01 March 2020
Journal of Paleontology (2020) 94 (2): 311–333.
DOI: https://doi.org/10.1017/jpa.2019.87
...Figure 9. Eumorphocystis multiporata Branson and Peck, 1940 , a diploporan blastozoan; OU 9048, view of E ray, broken surface adjacent to the thecal wall, no opening to the thecal interior. ...
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JPA volume 95 issue 2 Cover and Back matter

Published: 01 March 2021
Journal of Paleontology (2021) 95 (2): b1–b2.
DOI: https://doi.org/10.1017/jpa.2021.9
... embedment structures in Silurian Caryocrinites (Echinodermata, Rhombifera, Hemicosmitida) 327 Thomas E. Guensburg, James Sprinkle, Rich Mooi and Bertrand Lefebvre Evolutionary signifi cance of the blastozoan Eumorphocystis and its pseudo-arms 344 Hans-Dieter Sues and Rainer R. Schoch A new early-diverging...
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Arm-to-calyx transition of an early crinoid for comparison with Eumorphocy...

Arm-to-calyx transition of an early crinoid for comparison with Eumorphocy...

Published: 01 March 2021
Figure 5. Arm-to-calyx transition of an early crinoid for comparison with Eumorphocystis morphology: ( 1, 2 ) Apektocrinus ubaghsi Guensburg and Sprinkle, 2009 , 1983TX1, D ray arm trunk-to-calyx transition: ( 1 ) original image; ( 2 ) color overlay interpretation, color coding (also used
Journal Article

New insights concerning homology of the oral region and ambulacral system plating of pentaradial echinoderms

Colin D. Sumrall
Published: 10 May 2017
Journal of Paleontology (2017) 91 (4): 604–617.
DOI: https://doi.org/10.1017/jpa.2017.9
... the interior. Primary peristomial cover plates in blue and ambulacral cover plates in yellow cover the ambulacra. ( 9 ) Detail of the diploporitan Eumorphocystis multiporata Branson and Peck, 1940 SUI97599 showing the construction of the ambulacrum. Abradial floor plates in green are in contact...
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Maximum-likelihood ancestral range estimation of the diploporan and other r...

Maximum-likelihood ancestral range estimation of the diploporan and other r...

Published: 01 May 2021
as in Figs. 1 and 4 . Chronostratigraphy and age from the Geologic Time Scale 2016 (Ogg et al. 2016 ). Refer to Supplementary Table 1 for species’ groupings within Echinodermata. Fossil image of diploporan Eumorphocystis multiporata Branson and Peck 1940 , SUI 97599, modified from Sheffield and Sumrall
Journal Article

Testing for homologies in the axial skeleton of primitive echinoderms

Christopher R. C. Paul
Published: 20 February 2017
Journal of Paleontology (2017) 91 (4): 582–603.
DOI: https://doi.org/10.1017/jpa.2016.151
... diploporite Eumorphocystis Branson and Peck, 1940 apparently has five peri-orals. The latter are typical of crinoids. Types B1 and B2 differ in having both circlets of plates in B1 and only the circum-orals in B2. However, here I think the proposed homology of the two circlets breaks down due...
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Solving the Mystery of Crinoid Ancestry: New Fossil Evidence of Arm Origin and Development

Thomas E. Guensburg, James Sprinkle
Published: 01 May 2009
Journal of Paleontology (2009) 83 (3): 350–364.
DOI: https://doi.org/10.1666/08-090.1
... Ordovician Eumorphocystis (see illustrations in Parsley, 1982 ). This taxon has a medial column of plates along the backs of arms, in the brachial position, extending upward from the theca similar to crinoid brachials. Proponents of a blastozoan progenitor to crinoids informally point to this example...
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List of taxa used in the phylogenetic analysis (expanded from Guensburg et ...

List of taxa used in the phylogenetic analysis (expanded from Guensburg et ...

Published: 01 March 2021
, 1933 ‘Totiglobus’ lloydi Sprinkle, 1985 Pseudedriophus guensburgi Sprinkle and Sumrall, 2015 Blastozoans Kinzercystis durhami Sprinkle, 1973 Lepidocystis wanneri Foerste, 1938 Eumorphocystis multiporata Branson and Peck, 1940 Gogia kitchnerensis Sprinkle
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Diplopore-bearing taxa utilized within this phylogenetic analysis. The orig...

Diplopore-bearing taxa utilized within this phylogenetic analysis. The orig...

Published: 01 July 2019
Glyptosphaeritida Baltica Eucystis angelini Angelin, 1878 Glyptosphaeritida Baltica Eumorphocystis multiporata Branson and Peck, 1940 Glyptosphaeritida Baltica Fungocystites rarissimus Barrande, 1887 Glyptosphaeritida Gondwana Glyptosphaerites leuchtenbergi Volborth, 1846