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.
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Spongin fibers forming a reticulation.
Fibers may be cored with foreign spicules or sand grains.*
NO color changes on drying.
*Note: Spicules may be considered foreign if most are broken, if there are improbable combinations (calcareous or siliceous) or the density is low.
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.
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