Identifying Sponges

Key to California Porifera (Page 169)

( From page 164 A) Acanthostyles standing erect with heads embedded in a basal plate of spongin.
[A] GO TO PAGE 170
Sigmas present.
cc169A.jpg
Hymedesmia (Hymedesmia) sp. C Green & Bakus, 1994
Sponge: Encrusting. Consistency: fragile. Surface: prickly, hispid.
Color: Alive? Transparent.
Spicules: Megascleres: (1) Acanthostyles: 130 -173- 182 um. x 10 -11- 13 um. (2) Acanthostyles: 340 -423- 580 um. x 21 -22- 23 um. (3) Tornotes: 81 -154- 208 um. x 3.0 -5.0- 8.0 um. Microscleres: (1) Arcuate Isochelae: 21 -27- 34 um. (2) Sigmas: 16 -20- 23 um. (3) Sigmas: 55 -58- 59 um.
Skeleton: Ectosome: With Tornotes and Styles. Choanosome: With vertically-oriented. Acantho-subtylostyles of two size classes, heads buried in spongin.
Distribution: Southern California, Santa Maria Basin.
Depth: Deep water, 75-90 m.
Note: See page 170 for a closely related species.
[B] GO TO PAGE 171
NO Sigmas present.
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