Identifying Sponges

Key to California Porifera (Page 024)

( From page 022 B) Microscleres NOT Palmate Isochelae ONLY. Palmate Isochelae may be in combination with other microscleres OR other microscleres may be present without Palmate Isochelae.
[A]
Microscleres Toxas ONLY or Toxas with Microxeas
cc024A.jpg
Clathria (Wilsonella) pseudonapya (de Laubenfels, 1930)
Sponge: Encrusting to 1 cm thick. Consistency: fragile. Surface: Surface superficially smooth with irregularly scattered conules, 1 mm high. Oscula: and pores not evident.
Color: Alive: Yellow. Preserved: Pale drab.
Spicules: Megascleres: (1) Acanthostyles: 60 - 85 um. x 5.0 - 8.0 um. (2) Acanthostyle: 125 - 290 um. x 7.0 - 13.0 um. (3) Tylostyle with microspined heads: 230 - 365 - 410 um. x 5.0 - 13.5 um. Microscleres: (1) Toxa: 40-72 um. (2) May have Microxeas: 80-100 um.
Skeleton: Ectosome: Dermal membrane 50 μm; thick, fleshy, detachable, containing tangential Tylostyles. Choanosome: Mostly sand with scattered tracts or bundles of Tylostyles, points up, with echinating Acanthostyles.
Distribution: Southern to Central California.
Depth: Intertidal to subtidal.
Note: Sim & Bakus, 1986 report this species from Southern California with a single size class of Acanthostyle, 10 -59- 110 μm. Was Clathriopsamma pseudonapya.
[B] GO TO PAGE 025
Microscleres OTHER THAN Toxas ONLY, OR Toxas with Microxeas.
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