Identifying Sponges

Key to California Porifera (Page 195)

( From page 194 B) Acanthostyles < 180 μm.
[A]
Acanthostyles to 169 μm.
Subtylotes - Tylotes to 242 μm.
cc195A.jpg
?Hymedesmia (Hymedesmia) sp. F Green & Bakus, 1994
Sponge: Encrusting to < 0.2 mm thick. Consistency: fragile, smooth. Surface: granular.
Color: Alive: Transparent dermis, light orange base.
Spicules: Megascleres: (1) Acanthostyles: 121 -137-151- 169 um. x 8 um. (2) Subtylotes - Tylotes: 188 -202-225- 242 um. x 5 -7- 8 um. Microscleres: (1) Arcuate Isochelae: 24 -27- 30 um.
Skeleton: Ectosome: Thin detachable dermis with abundant Isochelae; tangential skeleton of Subtylotes. Choanosome: Vertically-oriented Acanthotylotes.
Distribution: Southern California.
Depth: Deep water.
[B]
Acanthostyles to 180 μm.
Subtylotes -Tylotes to 180 μm.
Hymedesmia (Hymedesmia) cf. levis (Lundbeck, 1910) [of Sim & Bakus, 1986]
Sponge: Encrusting to < 1.0 mm thick.
Color: Preserved: Light brownish-yellow.
Spicules: Megascleres: (1)Acanthostyles: 50 -110- 180 um. x 5 -6- 10 um. (2)Subtylotes - Tylotes: 150 -165- 180 um. x 2.4 -2.9- 4 um. Microscleres: (1)Arcuate Isochelae: 15 -22- 24 um.
Skeleton: No information given.
Distribution: Southern California,Santa Catalina Id.
Depth: Subtidal to deep water.
Note: Needs to be compared with type of H. levis. Is now considered Hymedesmia (Hymedesmia) levis which is reported from Iceland. No illustrations or specimens available.
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