Identifying Sponges

Key to California Porifera (Page 258)

( From page 252 A) Octasters present.
[A] GO TO PAGE 259
Large Hypodermal Pentactins are present.
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[B]
Large Hypodermal Pentactins are absent.
Acanthascus platei Schulze, 1899
Sponge: Tubular with sharp simple oscular margin.
Color: Not recorded.
Spicules: Megascleres: (1)Principal Diactins: 1.8 - 4.7- 10.4 mm. (2)Thick Prostal Diactins: 9.3 -12.1- 16.2 mm. Mesoscleres: (1) Dermal Pentactins (tangential ray): 72 -132- 201 um. (proximal ray): 76 -114- 172 um. (2) Gastral Hexactins (ray): 65 -109- 172 um. Microscleres: (1)Oxy-Hemioxyhexasters (diameter): 88 -109- 133 um. (2)Large Discoctasters (diameter): 194 -270- 382 um. (3)Small Discoctasters (diameter): 112 -137- 167 um. (4)Microdiscohexasters (diameter): 12.6 -18.6- 22.3 um.
Skeleton: Entirely of loose spicules.
Distribution: Southern and Central California.
Depth: Deep water.
Note: Lateral surface with low conules bearing Diactin prostalia. Measurements from Holotype USNM 7502.
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