Identifying Sponges

Key to California Porifera (Page 203)

( From page 202 B) Sponge spherical or subspherical; habitat: open coast attached to rocks.
[A]
With a conspicuous crown of spicules up to 5 mm high around oscules.
cc203A.jpg
Tetilla sp. B Hartman, 1975
Sponge: Spherical or subspherical. Oscula: with a conspicuous crown of spicules up to 5 mm high.
Color: Alive: Chrome-yellow to yellow-tan.
Spicules: Megascleres: (1) Oxeas: 1.2 mm - to several cm (2) Anamonaenes*: (3) Protriaenes*: (4) Prodiaenes*: (5) Anatriaenes-apparently only in anchor roots: (Too long to measure- often broken). Microscleres: (1) Sigmaspires:
Skeleton: Among the radiating spicule bundles are tracts of Anamonaenes; usually provided with a basal mat of long, thin spicules, mostly Anamonaenes.
Distribution: Central California.
Depth: Low to very low intertidal. On open coast.
[B]
WITHOUT a conspicuous crown of spicules around the oscula.
Craniella arb (de Laubenfels, 1930)
Sponge: Subspherical . Consistency: firm, cartilaginous. Surface: superficially hirsute. Oscula: to 3 mm, surrounded by a thick palisade of packed spicules.
Color: Alive: Pale tan when young, grey with buff when large.
Spicules: Megascleres: (1)Oxeas: 2 - 3 cm. x 9 - 50 um. (2)Anatriaenes: Chord 50 - 90 um. Rhabd > 10 um. (3)Protriaenes: Chord 8 - 30 um. Rhabd to 32 um. Microscleres: (1)Sigmaspires: 7 - 9 um.
Skeleton: Among the radiating spicule bundles are tracts of Anatriaenes. Young specimens usually without a well-developed basal mat of spicules while large specimens may have such a mat.
Distribution: Southern to Northern California.
Depth: Intertidal to deep water. Intertidally usually on undersides of overhanging rocks.
Note: Was Tetilla arb.
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