Identifying Sponges

Key to California Porifera (Page 175)

( From page 174 A) Diacts = Tornotes; Tips may be regular OR mucronate, smooth, OR elongated into a single spine.
[A]
Monacts of 1 size class.
Sigmas of 2 size classes.
GO TO PAGE 176
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Myxilla (Myxilla) incrustans (Johnston, 1842) [of Bakus, 1966]
Sponge: Thin encrusting to massive from 2.5 cm ( on Chlamus spp. or free-living) to 8 cm. thick . Consistency: firm. Surface: slightly rough, warty, to rugose, amorphous and fistulate. Oscula: abundant, 0.3 - 4.0 mm in diameter.
Color: Alive: Gold to light gold brown, with tinge of rose, yellow.
Spicules: Megascleres: (1) Acanthostyles: 104 -160-221- 248 um. x 6 -7-12- 14 um. (2) Tornotes: 116 -138-184- 265 um. x 2-4-5- 6 um. Microscleres: (1) Anchorate Isochelae: 11 -13-21- 26 um. (2) Anchorate Isochelae: 27 -37-52- 59 um. (3) Sigmas: 12 -15-27- 34 um. (4) Sigmas: 31 -37-43- 54 um.
Skeleton: Ectosome: Obvious dermal membrane with numerous irregularly distributed Tornotes parallel to surface. Choanosome: Moderately dense isodictyal reticulation of Acanthostyles with tracts of tightly bound Acanthostyles and Tornotes arising from the choanosome and penetrating the surface.
Distribution: Southern to Northern California.
Depth: Intertidal to deep water.
Note: Important discussion of this species on page 176.
[B] GO TO PAGE 177
Monacts include one type with 2 size classes.
Sigmas of 1 size class.
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