SEM images of spicules

Description:

(A–B) dermal hexactins; (C) atrial hexactin; (D) choanosomal pentactin; (E) hexactin of sieve-plate; (F) diactin of sieve-plate; (G) hemidiscohexaster; (H) discohexactin; (I) spiny microhexactin; (J) floricome; (K) drepanocome; (L) codonhexaster; (M) discaster; (N) detail of the disc of a discohexactin; (O) detail of common secondary rays of floricome; (P) detail of claws of secondary rays of floricomes; (Q) detail of tubercles in the middle of sieve-plate diactin; (R) detail of the umbels of a codonhexaster; (S) detail of the middle part of a codonhexaster; (T) detail of the center part of a hemidiscohexaster.