FIGURE 3 in Integrative taxonomic re-description of Halisarca magellanica and description of a new species of Halisarca (Porifera, Demospongiae) from Chilean Patagonia

FIGURE 3. Halisarca magellanica. Histological sections perpendicular to the surface of all three morphotypes stained with a combination of methylene blue/azure II and basic fuchsine. Cytoplasm stains light blue and nuclei darker blue, while collagen and mesohyl stain pink to purplish-red. Ectosome is thinner in morphotypes 1 and 3 than in morphotype 2. A, morphotype 1 (holotype RBINS-POR. 034) with structures still clearly recognizable after preservation for more than a hundred years in ethanol. B to C, morphotype 1 (RBINS-POR. 10827); D & E, morphotype 2 (RBINS-POR. 10753); F to I, morphotype 3 (F, RBINS-POR. 12918; G to I, RBINS-POR. 12921). (IC = inhalant canal; CC = choanocyte chamber; CL = complex collagen layer; EC = exhalant canal; In = invagination of the basal region of the collagenous layer; SC = spherulous cell). White doubleheaded arrows indicate ectosome; black double-headed arrows indicate choanosome; arrowheads indicate choanocyte chambers radially grouped around aquiferous canals.