Identifying Sponges

Key to California Porifera (Page 263)

( From page 262 B) Mean Discoctaster diameter is NOT greater than 200 μm.
[A]
Mean Discoctaster diameter is between 150 and 200 μm.
cc263A.jpg
Rhabdocalyptus asper Schulze, 1899
Sponge: Known only from fragments; probably saccate with veil.
Color: Not reported..
Spicules: Megascleres: (1) Principal Diactins: 4.9 -7.5- 11.3 mm. (2) Thick Prostal Diactins: 3 - 4 cm. (3) Thorned Hypodermal Pentactins (tangential ray): 5.5 -7.5- 11.1 mm. (4) Smooth Hypodermal Pentactins (tangential ray): 0.2 -0.49- 0.72 mm. (proximal ray): 1.8 -3.6- 5.4 mm. Mesoscleres: (1) Dermal Stauractins (ray): 107 -135- 201 um. (2) Dermal Pentactins (tangential ray): 94 -184- 292 um. (proximal ray): 106 -168- 250 um. (3) Gastral Hexactins (ray): 94 -146- 209 um. Microscleres: (1) Oxyhexactins (diameter): 92 -137- 171 um. (2) Oxy-hemihexasters (diameter): 126 -152- 194 um. (3) Discoctasters (diameter): 109 -190- 263 um.
Skeleton: Composed entirely of loose spicules.
Distribution: Southern California.
Depth: Deep water.
Note: Data mostly from Holotype USNM 7578.
Prostal diactins from Schulze, 1899. Tabachnick's 2002 proposed move of Rhabdocalyptus to a subgenus of Acanthascus is not followed here.
[B] GO TO PAGE 264
Mean Discoctaster diameter is less than 110 μm.
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