In Table 3 of this article (Guensburg et al., Reference Guensburg, Sprinkle, Mooi and Lefebvre2020) one of the characters is incorrectly placed. The correct Table 3 is given below.

Table 3. Matrix used in phylogenetic analysis. – = character state gap; ? = missing data.

In addition, the caption to Figure 6 is missing the name Titanocrinus. The correct caption should read:

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, small circular canals within floor plates: (1) OU238159, see Fig. 4.2; (2) 1404TX6, see Fig. 4.3; (3) NPL 93144, see Fig. 2.3; (4) pseudo-arm broken, seven floor plates distal to the orals, large ovate canal; (5, 7) proximal arm cross sections of the crinoids Titanocrinus (5) and Apektocrinus (7); (6, 8, 9) cross sections of blastozoan brachioles/arms with small canals: (6) rhipidocystid brachiole (after Sprinkle, 1973); (8) Gogia spiralis Robinson, 1965 brachiole (after Sprinkle, 1973); (9) uniserial Cambrian blastozoan arm (after Clausen et al., 2009). Green (light) = perforate extraxial buttress plates; green (dark) = perforate extraxial ‘radials’ and first backing plates; orange (light) = axial brachioles (floor plate extensions); other color coding as in Fig. 5.

The publisher apologizes for the errors.