Identifying Sponges

Key to California Porifera (Page 240)

( From page 238 B) Shape massive to lobate.
[A]
Ectosome melanistic.
Secondary fibers: 60 - 200 μm.
cc240A.jpg
Spongia (Spongia) idia de Laubenfels, 1932
Sponge: Massive. Consistency: spongy. Surface: profusely conulose. Conules < 1 mm high and 1 mm apart.
Color: Alive: Slate grey.
Spicules: None
Fibers: Primary fibers: With some spicular inclusions and somewhat fasciculated or fenestrated architecture. Secondary fibers: Often contorted, 60 - 200 μm in diameter.
Skeleton: Ectosome: Organic dermis, not readily detachable, melanistic; 300 - 700 μm thick. Endosome: Flesh packed with flagellate chambers, 25 - 30 μm. Endosome contains foreign spicules, fragments of spicules, some sand and debris.
Distribution: Central California.
Depth: Intertidal to subtidal.
[B]
Ectosome NOT melanistic.
Secondary fibers: 30 - 60 μm.
?Dysidea fragilis (Montagu, 1818) [of Sim & Bakus, 1986]
Sponge: Massive to lobate. Surface: finely conulose.
Color: Lavender to pale grey. ? Alive.

Spicules: None
Fibers: Primary (ascending) fibers: 114 - 190 μm, Secondary fibers: 30 - 60 μm. Fibers contain abundant foreign material.
Skeleton: No information given.
Distribution: Southern to Northern California.
Depth: Intertidal to subtidal.
Note: No figures available. D. fragilis known from Great Britain. A tentative Identification of a specimen from British Columbia. has been made but not confirmed.
START 001 002