FIGURE 13. Regadrella okinoseana Ijima, spicules (SEM). A. Common large dermal hexactin with enlargements of ray ends. B, C. Less common smaller dermal hexactins with near-equal ray lengths. D. Most common pentactin atrialium. E. Subhexactin atrialium. F. Rare hexactin atrialium. G. Rare stauractin atrialium with short knobs in the axis perpendicular to the page. H. Rare triactin atrialium. I. Rare diactin atrialium. J. Distinctive small diactin oscularium. K. Thin parenchymal diactin, whole and enlarged center and ray ends. L. Large parenchymal principal diactin, whole and enlarged center and ray ends. M. Floricome with enlarged primary ray end disc and terminal ray tips. N. Oxystaurasters in facial and side view; O. Oxyhexaster. P. Enlarged terminal ray end of oxystauractin. Q. Graphiocome centrum. R. Whole raphidial graphiocome terminal ray with enlargements of the proximal part.

Published as part of Reiswig, Henry M. & Stone, Robert P., 2013, New glass sponges (Porifera: Hexactinellida) from deep waters of the central Aleutian Islands, Alaska, pp. 1-64 in Zootaxa 3628 (1) on page 28, DOI: 10.11646/zootaxa.3628.1.1, http://zenodo.org/record/5261270