FIGURE 2 in Racekiela andina sp. nov. (Spongillida: Spongillidae): first report of a freshwater sponge from the Venezuelan Andes

FIGURE 2. SEM micrographs of spicules and a gemmule cross section. (A) Acanthoxeas. (B) Tri-layered gemmular theca. Radially embedded gemmoscleres can be seen. (C) Shorter gemmoscleres: birotules. Note the processes extending the axis in the third and fourth birotules to the right. (D) Longer gemmoscleres: pseudobirotules. The left-most spicule is a light micrograph. Both (C) and (D) show spicules deviating from the common types (far-right).