Identifying Sponges

Key to California Porifera (Page 199)

( From page 002 G) Megascleres Tetracts or derivatives (Monaenes, Diaenes, Triaenes, Dichotriaenes, etc.) and Sigmaspires OR Microxeas OR Asters present (commonly spicules very long -may have other spicules but NO calthrops).
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Microscleres present. May include Sigmaspires Spiny Sigmas, Asters or Microxeas. The latter are in the range of 35 - 100 μm long.
Microscleres absent.
Tetilla mutabilis de Laubenfels, 1930
Sponge: Pedunculate-clavate to irregularly massive to 8 cm. high. Consistency: spongy to cartilaginous. Surface: superficially hirsute with repent, exceedingly thin spicules matted together. Oscula: oval, flush.
Color: Alive: Dull red with green patches. Preserved: Dull red.
Spicules: Megascleres: (1)Prodiaenes/Protriaenes: Rhabd diameter 1 - 6 um. Clad length 30 - 90 um. (2)Oxeas with filiform tip: 2000 um. x 9 um. (3) Anatriaenes (rare): Rhabd diameter 3 - 7 um. Clad length 20 - 30 um. Chord 30 - 40 um.
Skeleton: Ectosome: Packed with Protriaenes, clads outward, arranged in non-erect brushes. Choanosome: In Clavate form, a central axis of packed spicules. This surrounded by large chambers with the outer walls with spicules in confusion. In massive forms, no central core.
Distribution: Southern to ?Central California.
Depth: Subtidal to Deep water.
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