Identifying Sponges

Key to California Porifera (Page 020)

( From page 011 B) Sponge surface usually hispid with nipple-like protuberences or a few papillae. Megascleres: Styles - Tylostyles OR Styles and Subtylostyles - Tylostyles.
[A]
Megascleres mostly Tylostyles ONLY but with only a few Styles and Subtylostyles.
Tylostyles to 2000 μm or greater. Heads terminal to subterminal, some polytyly.
Surface with many laterally flattened nipple-like protuberances, 1-2 cm high, yellow.
Color: Light lemon yellow to deep yellow.
cc020A.jpg
Polymastia pachymastia de Laubenfels, 1932
Sponge: Encrusting to 2 cm or more thick with numerous latererally flattened, smooth papillae, 1 to 2 cm high, yellow. Rest of surface hispid. Consistency: woody.
Color: Alive: Light lemon-yellow to deep yellow.
Spicules: Megascleres: (1) Styles-Tylostyles: 2000 or greater um. Range: varies greatly Heads: terminal to subterminal - some polytyly
Skeleton: Ectosome: Cortex-like, 1.5 mm thick, packed with spicules. Typically lacks small Tylostyles. Choanosome: Fleshy with radial columns.
Distribution: Southern to Northern California.
Depth: Intertidal to subtidal.
[B]
Megascleres Styles and Tylostyles.
Styles to 1320 μm . Subtylostyles to Tylostyles to 650 μm .
Surface wity a few rounded papillae, 2-3 mm wide and to 8 mm high, white.
Color: tan to white.
Polymastia pacifica Lambe, 1894 (cf. Green & Bakus, 1994)
Sponge: Cushion-shaped or thin crust to 6 mm thick with a few rounded papillae, white. Consistency: Firm, rough to prickly. Surface: smooth to hispid.
Color: ?Alive: Ectosome, dirty white; Choanosome, tan to white.
Spicules: Megascleres: (1) Style: 975 -1087- 1300 um. (2)Style: 590 -703- 770 um. (3) Subtylostyle -Tylostyle (thick): 250 -434- 650 um. (4)Subtylostyle-Tylostyle (thin): 88 -143- 244 um.
Skeleton: Ectosomal cortex, with abundant small Tylostyles, 1.5 mm thick. Tylostyles in cortex. Choanosome: Fleshy, with radial tracts of spicules. Styles to Sub-tylostyles in radial tracts and protrude from surface.
Distribution: Southern California; western Santa Barbara Channel, Santa Maria Basin.
Depth: Deep water: 54 to 78 m.
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