Identifying Sponges

Key to California Porifera (Page 209)

( From page 208 B) Megascleres do NOT include mesotriaenes.
[A]
Megascleres = Oxeas, Styles, Plagiotriaenes.
Color: dirty white.
cc209A.jpg
Geodia gibberosa Lamarck, 1815 [of Sim & Bakus, 1986]
Sponge: Massive to lobate, with fist-like projections. Sieve areas not noted by Sim and Bakus.
Color: Alive: Dirty-white to dark brown.
Spicules: Megascleres: (1) Oxeas/rare Styles: 1300 -1540- 2000 um. x 15 -26- 40 um. (2) Oxeas/Styles: 140 -187- 220 um. x 2 -4- 8 um. (3) Plagiotriaenes: Rhabds 650 -975- 1320 um. x 20 -31- 50 um. (4) Plagiotriaenes: Clads 80 -144 - 200 um. Microscleres: (1) Sterrasters: 40 -52- 60 um. (2) Oxyasters: 17 -22- 30 um. (3) Euasters oxeote (sometimes spined): up to 64 um.
Skeleton: No information given by Sim & Bakus. If this is G. gibberosa then it should have a cortical layer of Sterrasters covered by a subectodermal crust of Spherasters. Chonanosome: A confused interior with dispersed Spherasters and Oxyasters.
Distribution: Southern California.
Depth: Subtidal.
Note: Spicule drawings stylized. The Sim and Bakus material is not available for study.
[B]
Megascleres = Oxeas, Plagiotriaenes, -diaenes, -monaenes.
Color: white-rufous-brown; interior yellow.
Sidonops angulata Lendenfeld, 1910
Sponge: Tuberous with digitate processes. Surface: spicule fur covers surface. Oscula: round, 0.25-1 mm diameter,usually in groups and often on raised processes. Sieve plates present.
Color: Preserved: white-rufous-brown; interior dirty yellow.
Spicules: Megascleres: (1)Oxeas: Dermal: 9000 um. x 40 um. (2)Oxeas: Endosomal: 5600 um. x 105 um. (3)Plagiotriaenes: Rhabds to 4000 um. x 110 um. Clads often reduced to diaenes or monaenes. (4)Anatriaenes (often absent): Rhabds 9000 um. x 39 um. Microscleres: (1)Sterrasters: 122 - 170 um. x 87 - 97 um. (2)Spherasters (spined tornote rays): 21 - 28 um. (3)Euasters oxeote (sometimes spined): 64 um.
Skeleton: Ectosome: Cortex to 1-2 mm thick, packed with Sterrasters.
Distribution: Southern to Central California.
Depth: Deep water.
Note: Three other varieties of this species were described by Lendenfeld, 1910. Review of these is necessary.
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