Identifying Sponges

Key to California Porifera (Page 050)

( From page 049 A) Sigmas present; giant (means of largest size class > 100 μm) with serrated edges.
[A]
Sigmas thick with serrations large and obvious; largest size class to 289 μm.
Megascleres: Subtylostyles.
cc050A.jpg
Mycale (Paresperella) psila (de Laubenfels, 1930)
Sponge: Encrusting to amorphous, massive. Height to 8-10 cm. Surface: smooth. Oscula: few, 1 - 2.5 mm diameter.
Color: Alive:Light to dark gold, beige, drab, yellow-brown.
Spicules: Megascleres: (1) Subtylostyles: 224 -284-426- 485 um. x 3 -6-10- 12 um. Microscleres: (1) Sigmas: 29 - 44-65- 125 um. (2) Sigmas: 70 -111-241- 289 um. (3) Palmate Anisochelae: 11 -14-19- 25 um. (4) Palmate Anisochelae: 25 -31-38- 43 um. -often in rosettes (5) Toxa (rare): 12 - 47-100- 159 um.
Skeleton: Reticulate, anastomosing fibers with fiber arches just below the ectosome.
Distribution: Southern to Northern California.
Depth: Intertidal to 26 m.
Note: Was Paresperella psila.
[B]
Sigmas thin, with serrations small; largest size class to 400 μm.
Megascleres: Hastate Styles with Tornote points.
Mycale (Paresperella) sp. [of Lee]
Sponge: Upright, Conical, Christmas tree-shaped 11 cm high, base 4.5 cm across (may have bulbous anchor). Surface: somewhat wrinkled .
Color: not applicable since tissues sloughed off just prior to preservation..
Spicules: Megascleres: (1)Styles: 382 -408- 430 um. x 12 -14- 16 um. Microscleres: (1)Sigmas: 36 -119- 164 um. (2)Sigmas: 315 -372- 400 um. (3)Palmate Anisochelae: 22 -27- 31 um. (4) Palmate Anisochelae: 36 - 42- 53 um. (5)Toxa (rare): 36 -51- 65 um.
Skeleton: Arborescent, made up of expanding polygons delineated by anastomosing tracts of Styles.
Distribution: Monterey Bay, California.
Depth: 380 m.
Note: Much information has been compromised due to the fact that the tissues of this sponge sloughed off once it was retreived. The only photograph was from some distance and showed no detail.
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