Identifying Sponges

Key to California Porifera (Page 156)

( From page 154 B) Styles present. Acanthostyles present.
[A]
Toxa absent.
Acanthostyles of 2 size classes.
Styles present; 1 size class.
cc156A.jpg
?Clathria (Microciona) sp. A-2. (Green & Bakus, 1994)
Sponge: Thin, encrusting less than 1 mm thick. Consistency: fragile. Surface: prickly, slightly hispid. Oscula: no pores or oscula visible.
Color: Alive: Not given. Preserved: White, semi- transparent near the surface.
Spicules: Megascleres: (1) Acanthostyles: 122 -149- 187 um. x 10 -14- 18 um. (2) Acanthostyles: 320 -510- 720 um. x 18 -28- 36 um. (3) Styles: 290 - 447- 600 um. x 8 -11- 13 um. (4) Subtylotes: 200 -250- 300 um. x 5 -6- 8 um. Microscleres: (1) Palmate Isochelae: 18 -22- 26 um.
Skeleton: Ectosome: with Subtylotes. Choanosome: Acanthostyles with heads embedded in basal spongin. Styles, Acanthostyles and microscleres free in the choanosome.
Distribution: Southern California, Santa Maria Basin.
Depth: Deep water, 96 - 105 m.
Note: Originally designated as Hymedesmia (Holorodesmia) sp. A. Holorodesmia has now been synonymized with Clathria (Microciona). Diagrams from Green & Bakus, 1994
[B]
Toxas present - may be rare.
Acanthostyles 1 size class.
Styles with microspined heads, 2 size classes. Strongyles with microspined heads.
Megaciella sp. 2 [of Lee]
Sponge: Massive. Consistency: somewhat compressible. Surface: superficially smooth. Made of two types of regions: one domed or raised, very smooth but with well-spaced deep furrows; the other is verrucose. Oscula: on top of domed areas, ovule to elongate, 2-3 mm across.
Color: Alive: Orange.
Spicules: Megascleres: (1)Acanthostyles: 140 -177- 268 um. x 4.5-5.4 -6 um. (2)Strongyles, microspined heads: 125 - 398 um. x 1.5 -2.4- 3.5 um. (3)Styles, microspined heads: 121 -159- 194 um. x 1.5 -2.4- 3.5 um. (4)Styles: 218 -296- 394 um. Microscleres: (1)Palmate Isochelae: 15 -19- 23 um. (2)Toxas: 36 -54- 85 um.
Skeleton: Ectosome: Tangential layer of microspined Strongyles. Surface penetrated by Styles and Acanthostyles. Choanosome: Multispicular 1 tracts with single and paucispicular connections forming a thick reticulation.
Distribution: Central California.
Depth: Subtidal.
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