Identifying Sponges

Key to California Porifera (Page 208)

( From page 207 B) Megascleres may include Oxeas or Plagiomonaenes but also have other tetracts as well.
[A]
Megascleres include Mesotriaenes.
cc208A.jpg
Geodia mesotriaena Lendenfeld, 1910
Sponge: Subglobular to massive to 6 cm or greater. Pore sieves present. Surface: covered by dense spicular plush.
Color: Preserved: White, internally yellow.
Spicules: Megascleres: (1) Oxeas (rarely Styles or Strongyles): to 9000 um. x 20 - 112 um. (2) Plagiotriaenes or Plagiodiaenes: 9000 um. x 20 - 112 um. (3) Anatriaenes: 5000 - 10000 um. Rhabds: diameter 2 - 45 um. (may vary in size). (4) Mesoprotriaenes: Rhabds: 11- 48 um. (may be Protrianene or Orthotriaene; or may be a Triaene or Diaene or Monotriaene). (5) Dermal Oxeas or Styles: 200 um. x 2 - 13 um. Microscleres: (1) Sterrasters: Greatest diameters 65 - 118 um. least 42 - 83 um. (2) Strongylospherasters: diameter 4 - 15 um. (3) Oxyspherasters: diameter 6 - 24 um. (4) Oxyeuasters: diameter 9 - 35 um. (great variability; strongylote to oxeote; spined or not).
Skeleton: Ectosome: Cortex of Sterraster armor. Plagiotriaenes or -diaenes with clads in or just below cortex. Choanosome: Radiate.
Distribution: Southern to Northern California.
Depth: Subtidal to deep water.
Note: See Page 207A.
[B] GO TO PAGE 209
Megascleres do NOT include Mesotriaenes.
START 001 002