Identifying Sponges

Key to California Porifera (Page 243)

( From page 242 B) Megascleres: Principalia = Diactins and Hexactins, Marginalia = Pinular Diactins OR none, NO Sceptres or Uncinates.
[A]
Microscleres: 2 types of Macroamphidiscs, one regular and one barrel-shaped.
Microhexactins rough, curved- OR straight-rayed.
cc243A.jpg
Hyalonema (Oonema) bianchoratum bianchoratum Wilson, 1904
Sponge: Cup-shaped with deep atrial cavity.
Color: Not reported.
Spicules: Megascleres: (1) Diactins: 0.5 -1.5-2.0- 6.0 mm. (2) Hexactins (ray): 0.2 -0.85- 3.5 mm. (3) Pentactins (tangential ray): 0.35 - 0.85 mm. (4) Basals: Lost. Mesoscleres: (1) Pentactins (Pinules): 175 - 530 um. (basal ray): 30 - 44- 60 um. (2) Marginal Diactins- lost or absent: (3) Acanthophores: No data. Microscleres: (1) Macroamphidiscs (normal): 455 um. (2) Macroamphidiscs (barrel-form): 150 - 250 um. (3) Mesamphidiscs: 60 - 80 um. (4) Micramphidiscs: from 28 um. (5) Microxyhexactins: 40 -50- 60 um.
Skeleton: Entirely composed of loose spicules.
Distribution: Central California.
Depth: Deep water.
Note: Data from original description, Wilson, 1904. No sieve membrane present. Known only from off Central America (Pacific) and Southern California.
[B]
Microscleres: 1 type of Macroamphidisc, NONE barrel-shaped.
Microhexactins smooth, straight-rayed.
Hyalonema (Corynonema) populiferum Schulze, 1899
Sponge: Compact conical body with flaring margins to 20 cm diameter.
Color: Not reported.
Spicules: Megascleres: (1)Diactins: 1 - 1.5 mm. (2)Hexactins (ray): to 1 mm. (3) Pentactins (tangential rays): 80 - 100 mm. (basals): No data. Mesoscleres: (1) Pentactins (pinulus): 109 -191- 228 um. (basal ray): 23 -36- 72 um. (2) Marginal Diactins: 500 - 600 um. (3) Acanthophores: 300 - 600 um. Microscleres: (1)Macramphidiscs: 337 -410- 454 um. (2)Mesamphidiscs: 63 -128- 264 um. (3)Micramphidiscs: 16 -27- 53 um. (4)Oxyhexactins (diam.): 54 -66- 82 um.
Skeleton: Entirely composed of loose spicules; no fusion.
Distribution: Southern California.
Depth: Deep water.
Note: Data from Schulze, 1899, and Holotype USNM 7557.
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