Identifying Sponges

Key to California Porifera (Page 239)

( From page 238 A) Shape digitate to ramose.
[A]
Primary fibers: 78 - 130 μm.
Secondary fibers: 18 - 65 μm.
Oscula subapical, 3 mm in diameter.
cc239A.jpg
Aplysinopsis ? schmidti (Marenzeller, 1887) [of Green & Bakus, 1994]
Sponge: Digitate lobe. Subapical osculum 3 mm in diameter. Spongin fiber reticulation visible on surface. Fibers protrude from surface forming low conules. Consistency: spongy, rough.
Color: Tan ?Alive.
Spicules: None
Fibers: Protrude from surface forming conules 0.2 mm high. Anastomosing fibers (primary): 78 - 130 μm with foreign material, (secondary) 18 - 65 μm without foreign material. Foreign material includes sand grains and pieces of spicules.
Skeleton: Ectosome: Thin dermis. Choanosome: Anastomosing reticulum of spongin fibers.
Distribution: Russian arctic, ? Central California.
Depth: Deep water.
Note: Needs thorough review.
[B]
Primary fibers: 100 - 200 μm.
Secondary fibers: 10 - 25 μm.
Oscula inconspicuous, near 100 μm in diameter.
Dysidea amblia de Laubenfels, 1930
Sponge: Digitate to ramose to 20-30 cm high. Surface: conulose, conules less than 1 mm high and 1 mm apart. Oscula: inconspicuous, near 100 μm in diameter.
Color: Preserved: Drab.

Spicules: None
Fibers: Anastomosing fibers (primary): 100 - 200 μm, (secondary): 10 -25 μm. Fibers cored with sand grains, often greater than 100 μm in diameter.
Skeleton: Ectosome: A thin dermis, not detachable. Choanosome: Fibrous reticulation with meshes 250 μm in diameter. Choanocyte chambers 45 - 55 μm.
Distribution: Southern to Central California.
Depth: Intertidal to ?deep water.
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