Identifying Sponges

Key to California Porifera (Page 236)

( From page 235 B) NO basal plate of spongin and fibers not dendritic. Fibers anastomose to form a reticulation. No special ectosomal reticulation.
[A] GO TO PAGE 238
Spongin fibers forming a reticulation.
Fibers may be cored with foreign spicules or sand grains.*
NO color changes on drying.
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*Note: Spicules may be considered foreign if most are broken, if there are improbable combinations (calcareous or siliceous) or the density is low.
[B]
Spongin fibers forming a loose reticulation in a stiff jelly-like endosome permeated by canals.
Fibers clear yellow, lamellate.
Color changes from bright yellow to purple, then black on drying (exposure to air).
Aiolochroia thiona (de Laubenfels, 1930)
Sponge: Encrusting to 4 cm. Surface: superficially smooth with irregular conules from 0.5 mm to 10 cm high.
Color: Alive: Color changes from bright yellow to purple, then black on drying (exposure to air).

Spicules: None
Fibers: 45 - 150 μm; Pith 28-110 μm.
Skeleton: Spongin fibers form a loose reticulation in a stiff jelly-like choanosome permeated by canals.
Distribution: Southern California.
Depth: Intertidal.
Note: Reported as Aplysina fistularis by Sim & Bakus, 1986. Was listed by de Laubenfels, 1932, as Verongia thiona.
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