FIGURE 24 in <strong>New glass sponges (Porifera: Hexactinellida) from deep waters of the central Aleutian Islands, Alaska</strong>

FIGURE 24. Spicules of Staurocalyptus psilosus n. sp., from the Aleutian Islands (SEM). A. Whole prostal diactin and one tip enlarged. B. Hypodermal pentactins in end and lateral views, with enlarged tangential and proximal ray ends. C. Dermalia; whole pentactin and stauractin with enlarged ray ends. D. Atrialium, whole and enlarged ray end. E. Internal diactins, including short forms from hypodermal strands (left) and longer parenchymal thin and thick examples (right), with enlarged ends and an enlarged centrum of the dermal form. F. Whole examples of the two discoctaster size classes, dermal left (smaller) and atrial right (larger), with enlarged terminal ray ends and inset size-frequency plot of spicule diameters. G. Oxyhexaster with enlarged central area showing spine arrangement. H. Hemioxyhexaster. I. Oxyhexactin. J. Microdiscohexaster, whole and enlarged terminal ray ends.