Identifying Sponges

Key to California Porifera (Page 233)

( From page 232 B) No oscular fringe. Oxeas to 100 μm.
Sponge sac-shaped, laterally compressed to 8 mm wide.
Grantia sp. Hartman, 1975
Sponge: Sac-shaped. Laterally compressed up to 8 mm wide. Oscula: no oscular fringe.
Color: White ?Alive.
Spicules: Megascleres: (1) Cortical Triradiates: (2) Endosomal Triradiates-Quadriradiate: (3) Oxeas (tufts at surface): No measurements given.
Skeleton: Syconoid.Skeleton: A dermal cortical skeleton of tangentially arranged Triradiates with tufts of oxeas extending beyond the surface and a tangential layer of endosomal Triradiates and Quadriradiates.
Distribution: Central California.
Depth: Intertidal to subtidal.
Sponge encrusting, amorphous.
Leucandra losangelensis (de Laubenfels, 1930)
Sponge: Encrusting, amorphous to 3 cm thick. Surface: convoluted, smooth, lumpy, or with ridges. Oscula: numerous, oval, 1-3 mm.
Color: Alive: White to pale brown.
Spicules: Megascleres: (1)Triaxons rays: 100 - 426- 850 um. (2)Sagittal Triaxons: 60 -137- 250 um. (3)Quadriradiate : (paired rays) 180 - 210 um. (basal ray) 100 um. (apical ray) 20 - 40 um. (4)Oxeas: 80 -93- 100 um. Microscleres: (1)Microspined cylinders: 25 - 60 um.
Skeleton: Ectosome: Fleshy dermal membrane over a non-cellular layer. Choanosome: Leuconoid.
Distribution: Southern California.
Depth: Intertidal to deep water.
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