Identifying Sponges

Key to California Porifera (Page 193)

( From page 192 A) Acanthostyles> 300 μm
[A]
Acanthostyles not embedded in basal spongin.
Subtylotes-Tylotes > 239 μm.
cc193A.jpg
Lissodendoryx (Lissodendoryx) sp. 3 [of Lee]
Sponge: Massive to 5 mm thick and 5.4 mm long. Consistency: slightly compressible. Surface: superficially smooth to somewhat granular, with thin, transparent ectosomal membrane; covered with numerous crowded oscula with raised sides, these underlain by parallel subtylotes. Oscula: round to oval, 1 mm across.
Color: Not given.
Spicules: Megascleres: (1) Acanthostyles: 248 -311- 354 um. x 10 -11- 13 um. (2) Subtylotes-Tylotes: 227 -271- 296 um. x 5 -6- 9 um. Microscleres: (1) Arcuate Isochelae: 23 -30- 36 um.
Skeleton: Ectosome: Packed with tangential Subtylotes - Tylotes and Arcuate Isochelae near surface. Choanosome: Loose reticulation of Acanthostyles with ill-defined tracts to the surface. Otherwise, confused.
Distribution: Southern California.
Depth: Intertidal to deep water.
This species needs further study. It may belong to Hamigera.
[B]
Cross section of echinating branching tracts of Acanthostyles. At the base of these tracts, Acanthostyle heads embedded into basal spongin.
Subtyloles -Tylotes < 239 μm
?Hymedesmia (Hymedesmia) sp. B (Klontz, 1989)
Sponge: Thinly encrusting to 2 mm.
Color: Alive: Bright red.
Spicules: Megascleres: (1)Acanthostyles: 112 -206- 360 um. x 8.0 -8.9- 12 um. (2)Subtylotes - Tylotes: 149 -206- 239 um. x 4.0 -4.8- 6.0 um. Microscleres: (1)Arcuate Isochelae: 18 - 31 um.
Skeleton: Ectosome: Tightly packed Subtylotes perpendicular to and often protruding through the dermal membrane. Choanosome: Acanthostyles with heads embedded in basal spongin and forming echinating branching tracts which rise to the surface. Isochelae not abundant.
Distribution: Southern California.
Depth: Intertidal.
Originally described as new genus, new species B. The species belongs to the Hymedesmiidae. It needs futher review to discern if it is Hymedesmia or Phorbas.
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