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Ectenocrinus simplex

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Journal Article

Clinal variation in the evolution of Ectenocrinus simplex

Robert Titus
Published: 01 January 1989
Journal of Paleontology (1989) 63 (1): 81–91.
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At least ten complete juvenile specimens of <span class="search-highlight">Ectenocrinus</span> <span class="search-highlight">simplex</span> (Hall, ...

At least ten complete juvenile specimens of Ectenocrinus simplex (Hall, ...

Published: 22 April 2018
Figure 2 At least ten complete juvenile specimens of Ectenocrinus simplex (Hall, 1847 ) attached to a hardground within the Upper Ordovician Neuville Formation near Quebéc City in Canada. Jim found that lengthening of the stem follows a logistic pattern, with relatively slow growth
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Figure 9 —Figured specimens of <span class="search-highlight">Ectenocrinus</span> <span class="search-highlight">simplex</span> from Walcott-Rust Qu...

Figure 9 —Figured specimens of Ectenocrinus simplex from Walcott-Rust Qu...

Published: 01 January 2008
Figure 9 —Figured specimens of Ectenocrinus simplex from Walcott-Rust Quarry (unless otherwise indicated); all specimens from MCZ and coated with ammonium chloride. 1–12 , Growth sequence of crowns arranged in order of increasing crown volume; progressively larger specimens have more numerous
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Figure 14 —Graph of cup height and crown volume for <span class="search-highlight">Ectenocrinus</span> <span class="search-highlight">simplex</span> ...

Figure 14 —Graph of cup height and crown volume for Ectenocrinus simplex ...

Published: 01 January 2008
Figure 14 —Graph of cup height and crown volume for Ectenocrinus simplex . The equation was fitted to all specimens
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Figure 10 —Figured specimens of <span class="search-highlight">Ectenocrinus</span> <span class="search-highlight">simplex</span> from Walcott-Rust Q...

Figure 10 —Figured specimens of Ectenocrinus simplex from Walcott-Rust Q...

Published: 01 January 2008
Figure 10 —Figured specimens of Ectenocrinus simplex from Walcott-Rust Quarry; all specimens from MCZ and coated with ammonium chloride. 1, 2 , Medium sized crowns with relatively long stems attached, 113617, ×1.5, 133433, ×1.7. 3–5 , Long and short trimeric stems with attachment devices
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Figure 11 —Drawings of figured specimens of <span class="search-highlight">Ectenocrinus</span> <span class="search-highlight">simplex</span> from th...

Figure 11 —Drawings of figured specimens of Ectenocrinus simplex from th...

Published: 01 January 2008
Figure 11 —Drawings of figured specimens of Ectenocrinus simplex from the Walcott-Rust Quarry; all specimens from MCZ. 1–3 , Views of ramule segments from 133469, 133457, and 133462 having narrow food grooves and small covering plates (shaded), ×45. 4 , Articular surface of columnal with round
Journal Article

UPPER ORDOVICIAN CRINOIDS FROM THE PLATTEVILLE LIMESTONE OF NORTHEASTERN IOWA

JAMES C. BROWER
Published: 01 January 2007
Journal of Paleontology (2007) 81 (1): 103–115.
DOI: https://doi.org/10.1666/0022-3360(2007)81[103:UOCFTP]2.0.CO;2
...JAMES C. BROWER Abstract The Platteville crinoid fauna of northeastern Iowa consists of six species: Abludoglyptocrinus charltoni ( Kolata, 1975 ), Carabocrinus sp. Kolata, 1975 , Cupulocrinus plattevillensis Kolata, 1975 , Ectenocrinus simplex ( Hall, 1847 ), Merocrinus britonensis Kolata, 1975...
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SOME DISPARID CRINOIDS FROM THE UPPER ORDOVICIAN (SHERMANIAN) WALCOTT-RUST QUARRY OF NEW YORK

JAMES C. BROWER
Published: 01 January 2008
Journal of Paleontology (2008) 82 (1): 57–77.
DOI: https://doi.org/10.1666/06-077.1
...Figure 9 —Figured specimens of Ectenocrinus simplex from Walcott-Rust Quarry (unless otherwise indicated); all specimens from MCZ and coated with ammonium chloride. 1–12 , Growth sequence of crowns arranged in order of increasing crown volume; progressively larger specimens have more numerous...
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A crinoid fauna and a new species of Pycnocrinus from the Martinsburg Formation (Upper Ordovician), lower Hudson Valley, New York

James C. Brower, Carlton E. Brett, Howard R. Feldman
Published: 01 May 2024
Journal of Paleontology (2024) 98 (3): 402–419.
DOI: https://doi.org/10.1017/jpa.2024.4
... curtus with irregularly isotomous and heterotomous, non-pinnulate arms and a stout cylindrical column exceeding 700 mm; (2) the disparids Cincinnaticrinus varibrachialus , with heterotomous non pinnulate arms, and Ectenocrinus simplex , with extensively branched ramulate arms and meric columns of 460–500...
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Table 1 . Faunal counts for suspension feeding echinoderm assemblages in t...

Table 1 . Faunal counts for suspension feeding echinoderm assemblages in t...

Published: 01 March 2011
and Ectenocrinus simplex at other nearby localities. Pycnocrinus argutus poses a similar situation in which the one of the crinoids is on a small slab with a holdfast of Cincinnaticrinus varibrachialus . Hence, the merocrinids and Pycnocrinus argutus are assigned to the Cincinnaticrinus varibrachialus
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Figure 5 . Graphs showing size distributions of food particles for plankto...

Figure 5 . Graphs showing size distributions of food particles for plankto...

Published: 01 March 2011
Figure 5 . Graphs showing size distributions of food particles for plankton population and common Walcott-Rust Quarry crinoids and their ranges of ambient current velocities for feeding. Species shown are adult Cincinnaticrinus varibrachialus , adult Ectenocrinus simplex , Rhaphanocrinus
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Table 2 —Allometric equations for volumes and food-gathering system of Ci...

Table 2 —Allometric equations for volumes and food-gathering system of Ci...

Published: 01 January 2005
Table 2 —Allometric equations for volumes and food-gathering system of Cincinnaticrinus varibrachialus and Ectenocrinus simplex from Walcott-Rust Quarry. Student's t values that are significant at the 0.01 probability levels are indicated by **. Student's t tests compare observed exponents
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Paleoecological data for suspension feeding crinoids of the Martinsburg Qua...

Paleoecological data for suspension feeding crinoids of the Martinsburg Qua...

Published: 01 May 2024
(Brett et al., 2008 ; Brower, 2010 ). The estimates for the food grooves of Merocrinus curtus , Cincinnaticrinus varibrachialus , and Ectenocrinus simplex are derived from Brower ( 2005 , 2007 , 2008 , 2010 , 2011 ). In camerate crinoids most food particles are caught by the tube feet along
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Overview of large slab of dark Martinsburg shale from ~12’ above base of se...

Overview of large slab of dark Martinsburg shale from ~12’ above base of se...

Published: 01 May 2024
Figure 7. Overview of large slab of dark Martinsburg shale from ~12’ above base of section at “Shale Bank,” Mohonk Mountain House showing several significant specimens. ( 1 ) Uncompressed cylindrical homeomorphic columns of Ectenocrinus simplex (Hall, 1847 ), AMNH FI 162959a, compressed
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Figure 1 . Photographs and overlay drawings of representative slabs from t...

Figure 1 . Photographs and overlay drawings of representative slabs from t...

Published: 01 March 2011
Figure 1 . Photographs and overlay drawings of representative slabs from the Cincinnaticrinus varibrachialus – Ectenocrinus simplex assemblage from the Walcott-Rust Quarry: 1, 3, low density suite of crinoids, slab with 103132 and 133499, ×0.75; 2, 4, high density suite of crinoids, MCZ slab
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Figure 2 —Plots of equations and data for ecological variables of food-gat...

Figure 2 —Plots of equations and data for ecological variables of food-gat...

Published: 01 May 2006
, 1995 , 8 Praecupulocrinus conjugans , 9 Cupulocrinus levorsoni Kolata, 1986 ; disparids with extensive heterotomous ramules, 10 Ectenocrinus simplex , 11 Cincinnaticrinus varibrachialus ; camerates with pinnulate arms, 12 Euptychocrinus skopaios , 13 Abludoglyptocrinus charltoni ( Kolata, 1975
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Small slab showing two distinctive types of crinoid columns. ( 1 ) AMNH FI ...

Small slab showing two distinctive types of crinoid columns. ( 1 ) AMNH FI ...

Published: 01 May 2024
Figure 6. Small slab showing two distinctive types of crinoid columns. ( 1 ) AMNH FI 162962 cylindrical homeomorphic column of Merocrinus with even-height holomeric columnals; ( 2–4 ) AMNH FI 162961a–c uncompressed and compressed (collapsed) trimerous columns of Ectenocrinus simplex (Hall
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Table 1 —Equation data for aboral cup, brachs and ramulars of <span class="search-highlight">Ectenocrinu</span>...

Table 1 —Equation data for aboral cup, brachs and ramulars of Ectenocrinu...

Published: 01 January 2008
Table 1 —Equation data for aboral cup, brachs and ramulars of Ectenocrinus simplex (Hall) for Walcott-Rust Quarry sample. Student's t values for exponents that are significantly larger or smaller than the isometric value at the 0.05 and 0.01 probability levels are denoted by * and **
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Figure 15 —Graphs of crown volume and the food gathering system variables ...

Figure 15 —Graphs of crown volume and the food gathering system variables ...

Published: 01 January 2008
Figure 15 —Graphs of crown volume and the food gathering system variables for Ectenocrinus simplex . All equations were fitted to the combined samples from the Walcott-Rust Quarry and the Galena Group. The ontogenies of the crinoids from both samples are homogeneous for these relationships
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Table 3 —Student's t values comparing exponents and logarithms of initia...

Table 3 —Student's t values comparing exponents and logarithms of initia...

Published: 01 January 2008
Table 3 —Student's t values comparing exponents and logarithms of initial intercepts of equations for Walcott-Rust Quarry and Galena samples of Ectenocrinus simplex . Degrees of freedom for all tests is 36. Student's t value that is significant at the 0.05 probability level is denoted by *