FIGURE 4 in Integrative taxonomic re-description of Halisarca magellanica and description of a new species of Halisarca (Porifera, Demospongiae) from Chilean Patagonia

FIGURE 4. Halisarca magellanica. Ectosome in TEM. Sections perpendicular to the surface. A to C, exopinacocyte bodies mixed among spherulous cells Type 1 are located under a complex collagenous layer and reach the surface through thin processes ending as superficial flat extensions (arrowheads); D, limit between the unorganized collagenous structure (UC) and collagen fibrils (CF) of the complex collagen layer; E, narrow projection emerging from an exopinacocyte cell body (right), ending as a thin superficial extension (left); F, junction between superficial extensions of two exopinacocytes (arrow) with glycocalyx at the surface of the barely visible external dermal membrane. A, RBINS-POR. 10827; B to D, RBINS-POR. 12921; E & F, RBINS-POR. 12922. (B = bacterium; CL = complex collagenous layer; Ex = exopinacocyte; G = glycocalyx; In = invagination of the basal region of the complex collagen layer; N = Nucleus; n = nucleolus; Out = outside of the sponge; SC1 = spherulous cell Type 1). Black and white double-headed arrows indicate respectively outward (unorganized collagenous structure) and inward portions (tracts of collagen fibrils) of the complex collagenous layer.