Identifying Sponges

Key to California Porifera (Page 139)

( From page 138 B) No Sigmas.
[A]
Microscleres include Forceps of 2 size classes.
Arcuate Isochelae of 2 size classes.
cc139A.jpg
Forcepia (Forcepia) elvini Lee, 2001
Sponge: Encrusting, thick, irregular, somewhat rounded to 2.5 cm high and 3.5 cm wide. Consistency: firm. Surface: superficially smooth, with some lobes or layered flat plates. Edges are hispid, as is the overall surface. Oscula: difficult to interpret. Openings 1 - 3 mm in diameter, round to nearly so. Abundant, flush with surface.
Color: Preserved: Cream-white.
Spicules: Megascleres: (1) Styles - Acanthostyles (the latter with only a few spines): 257 -338-393 um. Width: 15 -16- 18 (2) Subtylotes: 222 -251- 335 um. x 6 -7- 10 um. Microscleres: (1) Arcuate Isochelae: 16 -19- 21 um. (2) Arcuate Isochelae: 26 -44- 49 um. (3) Forceps: 11 -15- 28 um. (4) Forceps: 36 - 49- 55 um. (5) Sigmas: 39 - 49- 56 um.
Skeleton: Ectosome: Thin layer of packed Subtylotes over which is a layer of packed microscleres. Choanosome: Robust reticulation of Styles.
Distribution: Central California. Cordell Bank.
Depth: Deep water.
[B] GO TO PAGE 140
Microscleres WITHOUT Forceps.
Arcuate Isochelae of 1 size class.
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