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entrance to the individual hydrospires by way of slits; and Spiraculata, which are characterized by indirect entrance to the hydrospires through canals by way...5 KB (508 words) - 15:10, 17 November 2023- Blastoids. These blastoids are characterized by indirect entrance to the hydrospires through canals by way of pores. Acentrotremites Ambolostoma Arcuoblastus...2 KB (86 words) - 21:58, 15 March 2021
- published by Paul & Toom (2021). A study on the functional efficiency of hydrospires of blastoids, evaluating their potential significance for longer survival...325 KB (28,146 words) - 22:48, 15 November 2024
- hydrospire (plural hydrospires) A flattened calcareous tube on each side of the midline of the inner part of the ambulacra of a blastoid
- Division A. Protoblastoidea.—Blastoidea without interambulacral groups of hydrospire-folds hanging into the thecal cavity. Families: Asteroblastidae, Blastoidocrinidae