Identifying Sponges

Key to California Porifera (Page 150)

( From page 147 A) Forceps present.
[A] GO TO PAGE 151
Monacts > 260 μm; means > 300 μm.
Forceps: > 50 μm.
cc150A.jpg
[B]
Monacts < 260 μm, means < 250 μm.
Forceps: < 15 μm.
Forcepia (Forcepia) hartmani Lee, 2001
Sponge: Thin to thick, encrusting up to 1.6 cm thick with more or less flat surface. Consistency: lightly compressible, friable. Surface: nodular, ridged. Ridges hispid and delineate shallow grooves. Oscula: numerous, 1.0 - 4.0 mm across, round to somewhat irregular with slightly raised lips. In the larger specimens, Oscula tend to be within surface grooves..
Color: Alive: Yellow-light orange, buffy citrine. Preserved: Light tan.
Spicules: Megascleres: (1)Styles-Acanthostyles with few spines: 169 -202-221- 251 um. x 7 -8-9- 10 um. (2)Tylotes - Subtylotes: 137 -166-185- 260 um. x 4 -5- 6 um. Microscleres: (1)Arcuate Isochelae: 21 -27-29- 34 um. (2)Sigmas: 30 -49-54- 64 um. (3)Forceps: 5 -8-9- 11 um.
Skeleton: Ectosome: Dense, crust-like mass of bound Tylotes - Subtylotes parallel to surface. Choanosome: Reticulation of wide tracts of Styles with overlying looser reticulation of random Styles and Tylotes.
Distribution: Central to Northern California.
Depth: Intertidal.
Note: May be confused with Lissodendoryx firma.
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