Identifying Sponges

Key to California Porifera (Page 049)

( From page 048 B) Megascleres: Styles, Subtylostyles, or Styles to Subtylostyles. Microscleres: Palmate Anisochelae, none J-shaped, and may have Toxas and/or Sigmas as well.

[A]

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Sigmas: present; giant (means of largest size class > 100 μm).
Serrated edges (easily seen under light microscopy).

[B]

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Sigmas present OR absent; if present, small to moderate (means of largest size class < 85 μm). NO serrated edges.