Identifying Sponges

Key to California Porifera (Page 179)

( From page 178 B) Isochelae both Anchorate and Unguiferous each of 2 size classes; Largest size class of Isochelae always exceeding 30 μm with means of 37-45 μm; Monacts: Styles to Acanthostyles OR Acanthostyles ONLY. Diacts: Tornotes with mucronate OR irregularly shaped and distinctly microspined tips.
[A]
Sigmas of 1 size class, 27 -40- 52 μm .
Monacts are heavily spined Acanthostyles.
cc179A.jpg
Myxilla (Myxilla) sp. 1[of Lee]
Sponge: Flat, encrusting. Surface: granular, hispid and grooved. Oscula: few, 0.3 - 1.0 mm in diameter.
Color: Unknown.
Spicules: Megascleres: (1) Acanthostyles: 128 -184-194- 227 um. x 7 -11- 15 um. (2) Tornotes: 142 -167-175- 205 um. x 7 um. Microscleres: (1) Anchorate/Unguiferous* Isochelae: 15 -20-21- 28 um. (2) Anchorate/Unguiferous* Isochelae: 35 -44-45- 50 um. (3) Sigmas: 27 -40- 52 um. *Anchorate and Unguiferous Isochelae both occur in 2 size classes and share similar ranges and means. Unguiferous Isochelae are rare while Anchorate Isochelae are abundant.
Skeleton: Ectosome: Dermal membrane thick with packed Acanthostyles and Tornotes penetrated by spicules from below. Choanosome: Isodictyal reticulation of 2-5 megascleres, mostly 3-sided reticulation.
Distribution: Central and Northern California.
Depth: Intertidal.
Note: May = M. beringensis of Pacific Northwest.
[B]
Sigmas of 2 size classes, 6 -20-21- 27 μm and 25 -34-43- 49 μm.
Monacts Styles and Acanthostyles.
Myxilla (Myxilla) sp. 4 [of Lee]
Sponge: Globular to elongate, amorphous 2 cm thick. Surface: superficially smooth but may have been hispid.
Color: Unknown.
Spicules: Megascleres: (1)Styles-Acanthostyles: 109 -184- 265 um. x 7 -10- 12 um. (2)Tornotes: 142 -158- 176 um. x 5 -6- 7 um. Microscleres: (1)Anchorate/Unguiferous* Isochelae: 16 -22- 27 um. (2)Anchorate/Unguiferous* Isochelae: 31 -37- 42 um. (3)Sigmas: 6 -20-21- 27 um. (4) Sigmas: 25 -30-43- 49 um. *Anchorate and Unguiferous Isochelae both occur in 2 size classes and share similar ranges and means. .
Skeleton: Ectosome: Thick dermal membrane penetrated by tracts whose ends penetrate the surface and form small dimples. Choanosome: Isodictyal reticulation of Acanthostyles with abundant microscleres.
Distribution: Central California, Carmel Bay.
Depth: Unknown. Dried beach specimen.
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