FIGURE 13 in Integrative taxonomic re-description of Halisarca magellanica and description of a new species of Halisarca (Porifera, Demospongiae) from Chilean Patagonia

FIGURE 13. Halisarca desqueyrouxae sp. nov. Ectosome in TEM. Sections perpendicular to the surface and surface of exopinacocytes seen in SEM (B). A & C, exopinacocyte bodies lie under the complex collagen layer and extend thin processes (arrowheads), which spread at the surface. Spherulous cells Type 3 can occur on both sides of the collagen layer; B, retraction of superficial extensions is an artefact resulting from the critical point dehydration; D, unorganized collagenous structure in the external part of the complex collagen layer (arrows indicate junctions between superficial extensions of two exopinacocytes); E, collagen fibrils in the internal part of the complex collagen layer in longitudinal section (CFL) and transversal section (CFT). A and B, RBINS-POR. 10754; C to E, RBINS-POR. 10803. (Ex, exopinacocyte; CF, collagen fibrils; SC1, spherulous cell Type 1; SC3, spherulous cell Type 3; SEx, superficial extension of underlying exopinacocyte; UC = unorganized collagenous structure). Black and white double-headed arrows indicate respectively outward (unorganized collagenous structure) and inward portions (tracts of collagen fibrils) of the complex collagenous layer.