FIGURE 3. Leucascus clavatus. A, Preserved specimens. NMV F42334 in Taxonomic revision of Leucascus Dendy, 1892 (Porifera: Calcarea) with revalidation of Ascoleucetta Dendy & Frederick, 1924 and description of three new species

FIGURE 3. Leucascus clavatus. A, Preserved specimens. NMV F42334 (left) and WAM Z40143 (right); B, Diactines protruding from the sponge surface of the specimens NMV F42334 and WAM Z40143 (in detail). C–F. NMV F42334. C, Diactine inserted in the choanosome; D, Cortical membrane; E, Spicules in the wall of a choanocyte tube; F, Apical actine projected into the lumen of a choanocyte tube.