Identifying Sponges

Key to California Porifera (Page 082)

( From page 076 B) Greatest spicule length between 140 and 180 μm.
[A]
Oxeas, 150 - 160 μm.
Vertical multispicular tracts.
Color: buff, tan, or dull orange brown.
cc082A.jpg
Neopetrosia vanilla (de Laubenfels, 1930)
Sponge: Encrusting to 15 mm thick. Consistency: stony hard. Surface: superficially smooth.. Oscula: round, often with raised rim, 1.0 - 2.0 mm diameter and 1 cm apart.
Color: Alive: White, pale yellowish drab, buff, tan or dull orange-brown.
Spicules: Megascleres: (1) Oxeas -with a bend at each end.: 150 - 160 um. x 11 - 12 um.
Skeleton: Ectosomal skeleton indistinct. Choanosome a confused reticulation with vertical multispicular tracts sometimes present, especially near surface. Spicules densely packed.
Distribution: Central California.
Depth: Low intertidal.
Note: Formerly known as Xestospongia vanilla.
[B]
Oxeas, 140 - 180 μm.
Irregular polygonal network.
Color: white.
Xestospongia dubia (Ristau, 1978)
Sponge: Encrusting 4-8 mm thick. Consistency: firm, incompressible. Oscula: 0.8-1.3 mm in diameter, 3-5 mm apart, either with volcano-like rims, 0.5-1.5 mm high or flush with surface.
Color: Alive: White.
Spicules: Megascleres: (1)Oxeas -straight to slightly curved: 140 - 180 um. x 10 - 16 um.
Skeleton: Tangential ectosomal skeleton of tracts, 2-5 spicules wide, forming an irregular polygonal network with meshes 120-140 μm. Choanosome, a reticulation of multispicular tracts, 6-10 spicules wide, varying to a confused arrangement of spicules..
Distribution: Central to Northern California.
Depth: Low intertidal to subtidal, 1.5 to 7 m.
Note: Was Adocia dubia. Adocia has been synonymized with Haliclona (Haliclona) by De Weerdt, 2002. However recent analyses places this species in Xestospongia.
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