Identifying Sponges

Key to California Porifera (Page 107)

( From page 106 B) Oxeas > 90 μm.
[A]
Sponge branched, branches cylindrical OR compressed into lobes.
Color: White.
Oxeas: Mean length, 160 - 180 μm.
cc107A.jpg
Neopetrosia zumi (Ristau, 1978)
Sponge: Erectly branching, branches to 2.0 cm. wide. These cylindrical or compressed into lobes. Coral-like. Consistency: firm-rigid. Surface: hispid. Oscula: 1.0 - 1.5 mm in diameter, surrounded by vertical spicules.
Color: Alive and Preserved: White.
Spicules: Megascleres: (1) Oxeas: 115 -160-180- 200 um. x 6 - 14 um. Microscleres: (1) Toxas-variable in shape: 50 - 90 um.
Skeleton: Ectosome, a tangential layer, 60 -80 μm thick, with Oxeas and Toxas. Ectosomal membrane supported by spicule bundles. Choanosome with multispicular tracts running toward surface. Single spicules united isodictially, or in confusion between tracts.
Distribution: Central, Southern California.
Depth: Subtidal to 18 m.
Note: This species was originally designated as Toxadocia zumi. This species appears quite different from Toxadocia now placed in Haliclona (Reniera) by de Weerdt, 2002. Recent review places it in Xestospongia.
[B]
Sponge encrusting.
Color: olive-beige to grey-brown.
Oxeas: mean length, 120 μm.
Haliclona (?Reniera) sp. (Hartman, 1975)
Sponge: Encrusting to 15 mm thick. Oscula: 2-3 mm across, sometimes on low mounds.
Color: Alive: Orange-beige, grey-brown, deep chrome-yellow.
Spicules: Megascleres: (1)Oxeas: 88 -120- 134 um. x 3.4 - 9.5 um. Microscleres: (1)Toxas: 35 - 96 um.
Skeleton: Paucispicular tracts with horizontal cross-spicules.
Distribution: Central California.
Depth: Intertidal to subtidal.
Note: Was Toxadocia. The genus Toxadocia was placed in Haliclona (Reniera) by DeWeerdt, but a current ongoing review is now underway assessing the possibility that this species may be Xestospongia.
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