FIGURE 5 in New Genus and species of Heteroxyidae from Brazil (Axinellida: Demospongiae: Porifera), with a revised identification key for the family

FIGURE 5. Comparative display of the spicules of other demosponge and of Alveospongia gen. nov. A, spicules of Crella (Pytheas) ula (redrawn from de Laubenfels, 1950); B, Sceptrintus-like spicules (from Lukowiak 2015); C, sanidasters of recent Sceptrintus richardi (redrawn from Topsent 1904); D, verticillate acanthostrongyles of Goreauiella auriculata Hartman, 1969 (from Rützler et al., 2014); E, looped and regular spicules of Batzella rosea van Soest, 1984 (redrawn from van Soest et al., 2016); F, acanthomicrostrongyles of Alveospongia sinuosclera sp. nov. (holotype). Scale bars: A: 50 µm; B–C: 100 µm; D–E: 50 µm; F: 30 µm.