FIGURE 5 in A new species of freshwater sponge, Heteromeyenia barlettai sp. nov. from an aquarium in São Paulo, Brazil (Spongillida: Spongillidae)

FIGURE 5. Scanning electron microscopy images of the spicule set of Heteromeyenia insignis Weltner, 1895 (MNRJ 0002). (a) Megascleres: acanthoxeas. (b) Detail of the shaft of a mesgasclere. (c) Acanthoxea microscleres' shapes. (d) Detail of the shaft of microscleres. (e) Pseudobirotule gemmulosclere. (f) Various shapes of birotule gemmuloscleres. (g) Detail of the pseudorotule of a pseudobirotule. (h) Detail of the rotule of a birotule. Scale bars: a 100 µm, b 10 µm, c, e, f 30 µm, d, g, h 5 µm.