Identifying Sponges

Key to California Porifera (Page 054)

( From page 053 B) Anisochelae with shaft distinctly curved; lateral alae not elongate and not flared at the edge. Sigmas of either 1 or 2 size classes. If 2 size classes, 12 -18-34- 51, 46 -53-66- 94 μm; if 1, 17 -38-58- 109 μm.
[A]
Sigmas of 1 or 2 size classes; large, thick, with a low arch. Large anisochelae with a long shaft and small head. Sh/LMax = 0.47 - 0.52.
cc054A.jpg
Mycale (Mycale) sp. 3 [of Lee]
Sponge: Rounded or amorphous, Lumpy to 10 cm high. Consistency: Spongy, compressible, fragile. Surface: generally smooth. Oscula: 1-3 mm diameter, open to surface and irregularly distributed.
Color: Alive: Yellow, dark brown.
Spicules: Megascleres: (1) Styles: 388 -535-660- 1071 um. x 7 -13-15- 17 um. Microscleres: (1) Sigmas: 17 -38-58- 109 um. (2) Palmate Anisochelae: 15 -21-28- 39 um. Sh/LMax 0.47 - 0.52. (3) Palmate Anisochelae: 84 -90-100- 133 um. (4) Rhaphides: 53 -58-89- 121 um.
Skeleton: Ectosome: A band of irregular and tangential Styles with penetrating tufts of spicules. Choanosome: with thick spicule bundles that ramify near surtace.
Distribution: Central and Northern California.
Depth: Subtidal to Deep water, 18 to 46 m or greater.
Note: This species bears a strong resemblance to M. lindbergi Koltun, 1958, and is identical to M. lingua described by Bakus, 1966.
[B]
Sigmas of 2 size classes; large size class thin with high arch.
Large anisochelae with a short shaft and large head.
Sh/LMax = 0.24 - 0.32.
Mycale (Mycale) toporoki (Koltun) ? n. var [of Lee]
Sponge: Elongate, rounded, or amorphous; Lumpy to 6 cm high. Consistency: Spongy, fragile. Surface: smooth.
Color: Alive: Light gray, grayish yellow.
Spicules: Megascleres: (1)Styles: 242 -505-529- 661 um. x 10 -14-16- 24 um. Microscleres: (1)Sigmas: 12 -16-25- 36 um. (2)Sigmas -thin: 31 -53-66- 109 um. (3) Palmate Anisochelae: 12 -18-34 - 51 um. (4) Palmate Anisochelae: 46 -53-66- 94 um. Sh/LMax 0.24 - 0.32 . (5) Raphides: 25 -56-66- 84 um.
Skeleton: Ectosome: A band of irregular and tangential Styles with penetrating tufts of spicules. Choanosome: with thick spicule bundles that ramify near surtace.
Distribution: Southern and northern California.
Depth: Subtidal to deep water, 14 to 46 m.
Note: This species appears to be M. toporoki but varies somewhat from the description and specimens of Koltun.
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