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Table S1. Elemental data from ossicles of extant crinoids.

Plate S1. Within-ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoid Endoxocrinus parrae parrae (BSE images), ZPALV.42c/R/2.1, North Atlantic Ocean, Grand Bahama Island, 402 m depth.

Plate S2. Within ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoid Neocrinus decorus (specimen no 1) (BSE images), ZPALV.42c/R/3.1, North Atlantic Ocean, Grand Bahama Island, 425 m depth.

Plate S3. Within ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoid Neocrinus decorus (specimen no 2) (BSE images), ZPALV.42c/R/3.4, North Atlantic, no precise locality data.

Plate S4. Within ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoid Metacrinus rotundus (specimen no 1) (BSE images), ZPALV.42c/R/1.1, NE Suruga Bay, southern coast of central Japan, 140 m depth.

Plate S5. Within ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoids (BSE images): Hypalocrinus naresianus, ZPALV.42c/R/5.1, North Pacific Ocean, Shima-Spur, off Kii Peninsula, Honshu Island, Japan, 805–852 m depth.

Plate S6. Within ossicle differences in the magnesium compositions in different morphological regions of extant isocrinid crinoid Neocrinus decorus (specimen no 3, ZPALV.42c/R/3.6, (A-C) and no 4 (ZPALV.42c/R/3.5, D-F)) (BSE images), North Atlantic, no precise locality data.

Plate S7. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoid Endoxocrinus parrae parrae (left) (specimen no 1), ZPALV.42c/R/2.1, North Atlantic Ocean, Grand Bahama Island, 402 m depth.

Plate S8. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoid Neocrinus decorus (left) (specimen no 1), ZPALV.42c/R/3.1, North Atlantic Ocean, Grand Bahama Island, 425 m depth.

Plate S9. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoid Neocrinus decorus (left) (specimen no 2), ZPALV.42c/R/3.4, North Atlantic, no precise locality and depth data.

Plate S10. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoid Metacrinus rotundus (left), ZPALV.42c/R/1.1, NE Suruga Bay, southern coast of central Japan, 140 m depth.

Plate S11. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoids: Hypalocrinus naresianus (left), ZPALV.42c/R/5.1, North Pacific Ocean, Shima-Spur, off Kii Peninsula, Honshu Island, Japan, 805–852 m depth (A-D) and Endoxocrinus parrae parrae (specimen no 2), ZPALV.42c/R/2.2, North Atlantic Ocean, Grand Bahama Island, 421–435 m depth.

Plate S12. Microstructural organization and basic geochemical characteristics of extant isocrinid crinoids: Metacrinus rotundus (left), ZPALV.42c/R/1.2, NE Suruga Bay, southern coast of central Japan, 140 m depth.

Plate S13. Microstructural organization and basic geochemical characteristics of a stalk fragment of extant isocrinid crinoid Neocrinus decorus (left), (specimen no 3, ZPALV.42c/R/3.6.

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