FIGURE 6 in Taxonomic revision of Leucascus Dendy, 1892 (Porifera: Calcarea) with revalidation of Ascoleucetta Dendy & Frederick, 1924 and description of three new species

FIGURE 6. Leucascus lobatus (ZMUCPOR-245, holotype). A, Cortical membrane; B, Transverse section showing the cortical membrane (arrow); C, Apical actine projected into the lumen of a choanocyte tube; D, Tripod (SEM); E, Triactine (left) and tetractine (right); F, Apical actine with spines (SEM).