Data from: Fusion or hypertrophy?: The unusual arms of the Petalocrinidae (Ordovician-Devonian; Crinoidea)

Ausich, William1; Mao, Yingyan2; Li, Yue2

Published Feb 05, 2019 on Dryad. https://doi.org/10.5061/dryad.9kj4ms0

Data files

Feb 05, 2019 version files 177.72 MB

Abstract

The large, triangular or cylindrical second brachial plate of the Petalocrinidae was formed through fusion of brachial plates along the distal margin of the growing arms. Based on the number of ambulacral bifurcations, brachials from the primibrachitaxis through at least the quintibrachitaxis may have been fused to form this large plate. In Petalocrinus, all calcite of fused second brachials assume the same crystallographic orientation, but in Spirocrinus more than one crystal comprises the second brachial plate.

Usage notes

SuppFig1-AusichMaoLi

Supplemental Figure 1. Color photomicrographs of thin sections of petalocrinids, in crossed-polarized light (scale bar 1.0 mm). (1, 2) Petalocrinus inferior Bather, 1898; OSU 54648; (1) central portion of second brachial plate, (2) distal edge of second brachial plate; (3, 4) Petalocrinus stenopetalus Mao et al., 2017; OSU 64649, (3) central portion of second brachial plate, (4) distal edge of second brachial plate; (5, 6) Spirocrinus circularis Mao et al., 2017; OSU 54650, (5) central portion of second brachial plate, (6) distal edge of second brachial plate, arrow indicates boundary between adjoining crystals (see color images and videos in Supplemental Figures).

SuppFig2_VideoAusichMaoLi

Supplemental Figure 2. Video of central portion of second brachial plate of Petalocrinus inferior Bather, 1898; OSU 54648; compare with Figure 3A and Supplemental Figure 1A.

SuppFig3_VideoAusichMaoLi

Supplemental Figure 3. Video of distal portion of second brachial plate of Petalocrinus inferior Bather, 1898; OSU 54648; compare with Figure 3B and Supplemental Figure 1B.

SuppFig4_VideoAusichMaoLi

Supplemental Figure 4. Video of central portion of second brachial plate of Petalocrinus stenopetalus Mao et al., 2017; OSU 64649; compare with Figure 3C and Supplemental Figure 1C.

SuppFig5_VideoAusichMaoLi

Supplemental Figure 5. Video of distal portion of second brachial plate of Petalocrinus stenopetalus Mao et al., 2017; OSU 64649; compare with Figure 3D and Supplemental Figure 1D.

SuppFig6_VideoAusichMaoLi

Supplemental Figure 6. Video of distal portion of second brachial plate of Spirocrinus circularis Mao et al., 2017; OSU 54650; compare with Figure 3E and Supplemental Figure 1E.

SuppFig6_VideoAusichMaoLi

Supplemental Figure 6. Video of distal portion of second brachial plate of Spirocrinus circularis Mao et al., 2017; OSU 54650; compare with Figure 3E and Supplemental Figure 1E.

SuppFig7_VideoAusichMaoLi

Supplemental Figure 7. Video of distal portion of second brachial plate of Spirocrinus circularis Mao et al., 2017; OSU 54650; compare with Figure 3F and Supplemental Figure 1F.

Data from: Fusion or hypertrophy?: The unusual arms of the Petalocrinidae (Ordovician-Devonian; Crinoidea)

Data files

Abstract

Usage notes

SuppFig1-AusichMaoLi

SuppFig2_VideoAusichMaoLi

SuppFig3_VideoAusichMaoLi

SuppFig4_VideoAusichMaoLi

SuppFig5_VideoAusichMaoLi

SuppFig6_VideoAusichMaoLi

SuppFig6_VideoAusichMaoLi

SuppFig7_VideoAusichMaoLi

Works referencing this dataset