Identifying Sponges

Key to California Porifera (Page 212)

( From page 002 I) Calthrops always present, with or without Monacts and/or Diacts, Asters or other microscleres.
[A] GO TO PAGE 213
Asters present.
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[B]
NO Asters present.
Plakina bioxea Green & Bakus, 1994
Sponge: Lamellar with smooth scalloped edges. Consistency: firm but compressible. Surface: smooth with scattered raised conules, 0.5 - 0.8 mm high.
Color: Preserved: White to light tan.
Spicules: Megascleres: (1)Oxeas: 68 - 96-166- 179 um. x 2 -4-6- 8 um. (2)Oxeas: 160 -504-679- 1160 um. x 6 -8-10- 13 um. (3)Oxeas: 800 -1125- 1280 um. Microscleres: (1)Calthrops-highly modified (ray): 7 -15-29- 38 um. (2)Calthrops (ray): 110 -208- 290 um. (3)Microxea: No measurements given .
Skeleton: Ectosome: Thin dermal membrane, granular in appearance; otherwise unorganized, densly packed with Calthrops. Choanosome: Basal layer of spicule tracts, these 0.150 - 0.200 mm in diameter (about 50 spicules thick), otherwise unorganized with crowded Calthrops and some Microxeas.
Distribution: Southern to ? Central California.
Depth: Deep water.
Note: See also Bakus & Green, 1987 under Pachastrella dilifera. More information may be needed to assure generic assignment. With oxeas, more like Pachastrella.
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