Identifying Sponges

Key to California Porifera (Page 201)

( From page 200 B) Microscleres other than Sigmaspires or Spiny Sigmas.
[A]
Microscleres = Microxeas.
No Asters present.
cc201A.jpg
Penares saccharis (de Laubenfels, 1930)
Sponge: Massive, rounded. Consistency: cartilaginous. Surface: superficially smooth. Oscula: round with depressed rounded edges. Diameter 200 μm.
Color: Alive: White, dark lavender-brown.
Spicules: Megascleres: (1) Oxeas (some styles): 400- 890 um. (2) Dichotriaenes: Clads 120 - 210 um. x 10 - 30 um. Rhabds 320 - 435 um. x 20 - 30 um. Microscleres: (1) Microxeas-often bent once or twice: 35 - 180 um. x 4 - 10 um.
Skeleton: Ectosome: Densely felted mass, 100 μm thick, of Microxeas and clads of Dichotriaenes. Choanosome: Vague tracts of Oxeas and some microscleres.
Distribution: Central California.
Depth: Low intertidal.
Note: Was Papyrula saccharis.
[B] GO TO PAGE 204
No Microxeas present; smallest Oxeas > 350 μm.
Asters present.
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