Identifying Sponges

Key to California Porifera (Page 197)

( From page 188 B) Microscleres Arcuate Isochelae AND Sigmas OR Arcuate Isochelae, Sigmas and Forceps.
[A] GO TO PAGE 198
Microscleres do NOT include Forceps;
Sigmas of 1 size class.
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[B]
Microscleres include Forceps.
Sigmas of 2 size classes.
Forcepia (Leptolabis) acanthostylosa Lee, 2001
Sponge: Thinly encrusting to 1.5 mm on Hinnites multirugosus, or thickly encrusting to 3.3 cm, irreg. Consistency: firm but soft and elastic. Surface: smooth, opaque,somewhat irregularly lobate to verrucose, gently undulating.
Color: Alive: Yellow to orange; Preserved: Light tan.
Spicules: Megascleres: (1)Acanthostyles: 68 -77-84- 101 um. x 2.4 -3.9-5.8- 7.3 um. (2)Acanthostyles: 181 -220-236- 265 um. x 2.4 -4.4-7.0- 9.7 um. (3)Subtylotes-Tylotes: 195 -227-233- 258 um. x 3.6 -5.0-5.6- 6.0 um. Microscleres: (1)Arcuate Isochelae: 22 -26-29- 36 um. (2)Arcuate Isochelae: 46 -51-58- 68 um. (3)Sigmas: 26 -38- 47 um. (4) Sigmas: 53 -68-72- 78 um. (5) Forceps: 7 -10-11- 13 um. (6)Forceps: 21 -24- 29 um.
Skeleton: Ectosome: Tightly packed Tylotes - Subtylotes parallel to surface. Choanosome: Loose reticulation of Acanthostyles with thick tracts, many microscleres, dense.
Distribution: Southern California.
Depth: Subtidal.
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