Identifying Sponges

Key to California Porifera (Page 251)

( From page 250 B) Main (most abundant) microscleres NOT stout Oxyhexasters.
[A]
Main microscleres are thin Oxyhexactins.
cc251A.jpg
Heterochone incognitus (Koltun, 1967)
Sponge: Compound-infundibuliform but poorly known.
Color: Not reported.
Spicules: Megascleres: (1) Uncinates: 3.6 -5.4- 7.1 mm. (2) Pinular Hexactins (dermalia): (distal ray): 123 -164- 222 um. (tangential ray): 128 -168- 227 um. (proximal ray): 68 -170- 352 um. Mesoscleres: (1) Hexactin 1: (ray) 100 -172- 278 um. (2) Hexactin 2: (ray) 146 -216- 341 um. (3) Scopules: 369 -571- 756 um. Microscleres: (1) Oxyhexactins: (diameter): 64 -92- 126 um. (2) Hemioxyhexasters: (diameter): 65 -100- 129 um. (3) Discohexasters: (diameter): 21 -29- 44 um.
Skeleton: Framework penetrated by diarhysial channels.
Distribution: Southern California.
Depth: Deep water.
Note: Known only elsewhere from Kurile Islands. Data and figures from SIO P 592.
[B]
Main microscleres are Discohexactins.
Heterochone tenera (Schulze, 1899)
Sponge: Infundibuliform with short lateral tubes.
Color: Not reported.
Spicules: Megascleres: (1)Uncinates: absent?: (2)Pinular Hexactins: (distal ray): 95 -191- 371 um. (tangential ray): 137-210- 291 um. (proximal ray): 111 -325- 556 um. Mesoscleres: (1) Hexactins (ray): 78 -168- 297 um. (2) Scopules: 244 -409- 598 um. Microscleres: (1)Discohexactins (diameter): 54 -70- 87 um. (2)Discohexasters (diameter): 47 -66- 86 um. (3)Oxyhexasters (diameter): 67 -98- 138 um.
Skeleton: Framework penetrated by diarhysial channels.
Distribution: Southern and Central California.
Depth: Deep water.
Note: Data from Cotype USNM 7542.
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