Identifying Sponges

Key to California Porifera (Page 056)

( From page 055 B) Megascleres are Styles or Subtylostyles which are NOT sinuous. Microscleres include Sigmas of 1size class. Sigmas with mean < 60 μm. Toxas ABSENT.
Megascleres: Styles-Subtylostyles; These distinctly wider at center often with narrow "handle" at head end.
Skeleton, Plumo-reticulate, dendritic.
Mycale (Aegograpila) adhaerens (Lambe, 1894)
Sponge: Amorphous, massive. Encrusting on Chlamas spp. to free-living. Consistency: Spongy, Compressible. Surface: Smooth, felty to the touch. Oscula: when present, to 4 mm diameter, may be on conules.
Color: Alive: Light yellow, gray, light brown to violet.
Spicules: Megascleres: (1) Styles-Subtylostyles: 242 -320-374 - 461 um. Microscleres: (1) Sigmas -may be rare: 19 -41-57- 89 um. (2) Anisochelae: 14 -16-17- 29 um. (3) Anisochelae: 22 -34-35- 48 um. (4) Anisochelae: 51 -66-81- 92 um. (5) Raphides: 29 -66- 111 um.
Skeleton: Ectosome: Thin membrane with regular reticulation of 3-6 spicules forming triangular or quadrangular spaces parallel to surface. Choanosome of parallel often curved and branching tracts of styles (Plumo-reticulate, dendritic).
Distribution: Southern to Northern California.
Depth: Intertidal to deep water, 380 m.
[B] GO TO PAGE 057
Megascleres: Styles: equal width until point and no narrow "handle"at head end.
Skeleton: Ladder-like or nearly so.
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