Assertion: sponge's spicule | /r/HasAspect | a triaxonic symmetry
Facets:
Source sentences:
text: Hexactinellids are clearly distinct from other sponges in that their soft tissues are largely syncytial and their siliceous spicules have a triaxonic symmetry; they are viviparous and produce distinctive trichimella larvae (see  for a comprehensive review of glass sponge biology).