Identifying Sponges

Key to California Porifera (Page 151)

( From page 150 A) Monacts > 260 μm; means > 300 μm; Forceps: > 50 μm.
[A]
Styles: 268 - 499 - 593 μm.
Arcuate Isochelae of 2 size classes.
Sigmas of 1 size class.
cc151A.jpg
Forcepia (Forcepia) macrostylosa Lee, 2001
Sponge: Thick, massive, somewhat domed -bulbous 23 mm thick. Consistency: compressible. Surface: superficially smooth. Some areas smooth others layered with overlapping thin, fine plates. Oscula: difficult to discern.
Color: Alive: Unknown. Preserved: Light tan.
Spicules: Megascleres: (1) Styles-Subtylostyles: 268 -499- 593 um. x 18 -20- 22 um. (2) Subtylotes: 309 - 372- 540 um. x 6 -8- 9 um. Microscleres: (1) Arcuate Isochelae: 19 -23- 29 um. (2) Arcuate Isochelae: 36 -44- 50 um. (3) Sigmas: 45 -60- 66 um. (4) Forceps: 9 -50- 87 um.
Skeleton: Ectosome: Removeable thin layer of packed Subtylotes. Sometimes worn away. Choanosome: Ladder-like reticulation with tracts of Subtylostyles supporting a loose reticulation. Ladder-like skeleton less obvious near surface where it may bend parallel to surface.
Distribution: Southern California, Catalina Basin.
Depth: Deep water.
[B]
Styles: 533 -601- 697 μm.
Arcuate Isochelae of 1 size class.
Sigmas of 2 size classes.
Forcepia (Forcepia) hymena (de Laubenfels, 1930)
Sponge: Globular, massive to 3.5 cm high. Consistency: soft, compressible, spongy. Surface: some areas superficially smooth, but mostly roughened, verrucose. Surface with shallow grooves and smooth ridges and small, rounded conules. Oscula: numerous, round to elongate, 1.5 - 4.0 mm across. Flush with surface.
Color: Alive: Drab. Preserved: Dark tan to brown.
Spicules: Megascleres: (1)Styles: 533 -601- 697 um. x 13 -14- 16 um. (2) Subtylotes: 273 -327- 448 um. x 5.5 -6.9- 7.0 um. Microscleres: (1)Arcuate Isochelae: 24 -38- 48 um. (2)Sigmas: 60 -77- 99 um. (3)Sigmas: 169 -208- 243 um. (4)Forceps: 22 -38- 51 um.
Skeleton: Ectosome: Dermal membrane with abundant microscleres with compact bundles of Subtylotes below, parallel to surface. Choanosome: Rugged reticulation of Styles between tracts of Styles. Frequently with much sand and detritus.
Distribution: San Diego Trough to Monterey Bay, CA.
Depth: Deep water: 700 - 1216 m.
Note: see page 46B and 66B.
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