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![Proexenocrinus inyoensis Strimple and McGinnis, 1972, SUI 134561a, holotype crown, C ray orientation, partly compressed, partial siliceous case-hardened coating. (1) Entire specimen with slightly depressed interrays, two fixed primibrachials, secundibrachials one and possibly two fixed, partial view of 10 pinnulate arms, pinnules branch from cuneate brachials in alternating direction, circular stalk with rounded nodal epifacets; boxes outline positions of high magnification enlargements; (2) enlargement of CD interray showing anitaxis, the mid-portion of which is crushed and offset, black arrow indicates exposed apparent lateral floorplate margins; (3) high-magnification images of box at left, rotated counterclockwise; pore-bearing floor plates visible as one half of biseries on three pinnules where pinnulars are etched away; arrows at right mark boundaries of line drawing in Figure 3 showing faint transverse keels; left side pinnule weathered, but still showing podial pores (see Fig. 2.3 for comparison with an edriosterid edrioasteroid).]()
![(1, 2) Proexenocrinus inyoensis Strimple and McGinnis, 1972. (1) SUI 134562, paratype crown, anterior orientation, siliceous case-hardened coating over much of the specimen, shallow basal concavity, radials separated all around, interrays depressed, arms branching once per ray with primibrachial two axillary, round stalk with projecting round epifacets; (2) SUI 134561a, holotype, right hand box in Figure 1.1, high-magnification SEM image showing portions of four weathered pinnules, beveled by weathering, pinnulars more deeply etched, wedge-shaped cover plates standing in relief, best preserved cover plate arrangement on second pinnule from left showing alternating biseries; (3) PE 52690, edrioasterid sp. (Guensburg and Sprinkle, 1994), trilobite zone G2, early Floian, western Utah, portion of ambulacrum interior, showing large internal pockets between successive dumbbell-shaped floor plates, faint transverse keels between successive elements; comparable with much smaller Proexenocrinus floor plates in Figure 1.3 (see Bell and Sprinkle, 1978, pl. 2, fig. 10, pl. 3, fig. 1 for similar morphology in the middle Cambrian edrioasterid Totiglobus).]()
![Proexenocrinus inyoensis Strimple and McGinnis, 1972; SUI 134561a, holotype, brachial- and floor-plate tracings, position indicated by arrows on Figure 1.3; two pinnulars on left (dark gray), floor plates exposed on right where pinnulars are stripped away (orange or lighter gray); width of segment indicated ~1.1 mm.]()
![Proexenocrinus inyoensis Strimple and McGinnis, 1972; SUI 134561a, holotype, CD interray plate tracings from much enlarged image. C ray plates on right, radial indicated in black, posterior plate dominated by anitaxis; anitaxis formed of thick-plated uniserial series; smaller, thinner, plates to either side; dashed lines indicate uncertain plate boundaries. Height of anitaxis as exposed ~5.8 mm.]()
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1-8 OF 8 RESULTS FOR
Proexenocrinus inyoensis
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Journal Article
The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 July 2021
Journal of Paleontology (2021) 95 (4): 800–804.
...Thomas E. Guensburg Abstract Restudy of Proexenocrinus inyoensis Strimple and McGinnis, 1972 , shows that this earliest-known rhodocrinitid diplobathrid camerate crinoid (late Floian, Early Ordovician) expresses the only known record of ambulacral floor plates within pinnules. These pinnule floor...
FIGURES
Image
Proexenocrinus inyoensis Strimple and McGinnis, 1972 , SUI 134561a, holot... Available to Purchase
in The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids
> Journal of Paleontology
Published: 01 July 2021
Figure 1. Proexenocrinus inyoensis Strimple and McGinnis, 1972 , SUI 134561a, holotype crown, C ray orientation, partly compressed, partial siliceous case-hardened coating. ( 1 ) Entire specimen with slightly depressed interrays, two fixed primibrachials, secundibrachials one and possibly two
Image
( 1, 2 ) Proexenocrinus inyoensis Strimple and McGinnis, 1972 . ( 1 ) SU... Available to Purchase
in The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids
> Journal of Paleontology
Published: 01 July 2021
Figure 2. ( 1, 2 ) Proexenocrinus inyoensis Strimple and McGinnis, 1972 . ( 1 ) SUI 134562, paratype crown, anterior orientation, siliceous case-hardened coating over much of the specimen, shallow basal concavity, radials separated all around, interrays depressed, arms branching once per ray
Image
Proexenocrinus inyoensis Strimple and McGinnis, 1972 ; SUI 134561a, holot... Available to Purchase
in The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids
> Journal of Paleontology
Published: 01 July 2021
Figure 3. Proexenocrinus inyoensis Strimple and McGinnis, 1972 ; SUI 134561a, holotype, brachial- and floor-plate tracings, position indicated by arrows on Figure 1 .3; two pinnulars on left (dark gray), floor plates exposed on right where pinnulars are stripped away (orange or lighter gray
Image
Proexenocrinus inyoensis Strimple and McGinnis, 1972 ; SUI 134561a, holot... Available to Purchase
in The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids
> Journal of Paleontology
Published: 01 July 2021
Figure 4. Proexenocrinus inyoensis Strimple and McGinnis, 1972 ; SUI 134561a, holotype, CD interray plate tracings from much enlarged image. C ray plates on right, radial indicated in black, posterior plate dominated by anitaxis; anitaxis formed of thick-plated uniserial series; smaller
Image
Matrix used in phylogenetic analysis. − = character state gap; ? = missing ... Available to Purchase
in Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms
> Journal of Paleontology
Published: 01 March 2021
nealli 0-0?1 -1001 12101 11111 11100 10100 320?- -111 Hybocrinus nitidus 00000 10001 10001 11110 11111 12110 42010 2000 Eknomocrinus wahwahensis 00??0 10001 12100 1?111 10000 00000 420?- -000 Proexenocrinus inyoensis
Journal Article
Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 01 March 2021
Journal of Paleontology (2021) 95 (2): 327–343.
... nealli 0-0?1 -1001 12101 11111 11100 10100 320?- -111 Hybocrinus nitidus 00000 10001 10001 11110 11111 12110 42010 2000 Eknomocrinus wahwahensis 00??0 10001 12100 1?111 10000 00000 420?- -000 Proexenocrinus inyoensis...
FIGURES
Journal Article
Phylogeny and morphologic evolution of the Ordovician Camerata (Class Crinoidea, Phylum Echinodermata) Available to Purchase
Journal: Journal of Paleontology
Publisher: Paleontological Society
Published: 09 February 2017
Journal of Paleontology (2017) 91 (4): 815–828.
... pyriformis (Billings, 1857 ) Darriwilian Billings, 1859 ; Wachsmuth and Springer, 1897 Proexenocrinus inyoensis Strimple and McGinnis, 1972 Floian Strimple and McGinnis, 1972 ; Ausich, 1985 Quechuacrinus tisca Guensburg and Waisfeld, 2015 Floian Guensburg and Waisfeld, 2015...
