Identifying Sponges

Key to California Porifera (Page 193)

( From page 192 A) Acanthostyles> 300 μm
Acanthostyles not embedded in basal spongin.
Subtylotes-Tylotes > 239 μm.
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.
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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