FIGURE 4 in Thorectinae (Porifera: Demospongiae: Dictyoceratida) from Northeastern Brazil: two new species and transfer of Scalarispongia cincta (Boury-Esnault, 1973) to the genus Thorecta Lendenfeld, 1888

FIGURE 4. Scalarispongia tubulata sp. nov. (A) Holotype (MNRJ 17620); (B) Paratype (UFSPOR 223); (C) Reticulated skeleton of isolated spongin fibers, showing a cored primary fiber (pf) and an uncored secondary reticulum (sr); (D). Elements of fiber skeleton: cored primary fibers (pf), uncored secondary fibers (sf), pseudo-tertiary fibers (ptf) and secondary web (sw); (E) Cross section of the fiber skeleton; (F) Histological section. Scale bars: A–B, 1 cm; C, 205 µm; D, 82 µm; E, 550 µm, F, 250 µm.