FIGURE 28 in <strong>New glass sponges (Porifera: Hexactinellida) from deep waters of the central Aleutian Islands, Alaska</strong>

FIGURE 28. Spicules of Rhabdocalyptus mirabilis Schulze, from the Aleutian Islands (SEM). A. Prostal paratropal hypodermal pentactins from side and top, with enlargements of proximal and distal parts of thorned tangential rays. B. Prostal paratropal hypodermal pentactin from submarginal zone with four tightly grouped tangential rays and enlargement of part of a thornless tangential ray. C. Prostal crucial hypodermal pentactin from same area, with enlarged ray end. D. Dermalia, including main diactins with enlarged ray end, irregular diactin, triactin, stauractin and monactin. E. Atrialia, whole hexactin and pentactin (rare), with enlarged distal and tangential ray tips. F. Parenchymal diactins, whole and enlarged ray tips from thinner (above) to thicker (below) forms. G. Prostal diactin, whole and enlarged middle and end. H. Discoctaster, whole and enlarged centrum and terminal ray tips. I. Oxyhexactin, whole and enlarged centrum. J. Hemioxyhexaster. K. Oxyhexaster. L. Microdiscohexaster.