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.
Microscleres Toxas ONLY or Toxas with Microxeas
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.
START 001 002