Identifying Sponges

Key to California Porifera (Page 116)

( From page 115 B) Acanthostyles with spines at head end or over entire body; Styles usually not present with the exception of rare or juvenile acanthostyles that look like styles. May have Tylotes-Subtylotes OR Strongyles.
[A]
Strongyles present.
Acanthosubtylostyles of 2 size classes.
cc116A.jpg
Hymedesmia (? Stylopus) sp. D Green & Bakus, 1994
Sponge: Encrusting. Consistency: elastic, fragile. Surface: superficially smooth; depressions and openings 0.15 to 0.4 mm.
Color: Alive: Orange-yellow.
Spicules: Megascleres: (1) Acanthosubtylostyles: 83 -96- 164 um. x 5 -7- 10 um. (2) Acanthosubtylostyles: 220 -260- 280 um. x 10 -12- 13 um. (3) Strongyles-one end may be subtylote: 208 -241- 265 um. x 5 um.
Skeleton: Ectosome with bundles of Strongyles.. Choanosome with vertically-arranged Acanthotylostyles, heads buried in spongin.
Distribution: Southern California, Santa Maria Basin.
Depth: 75 - 90 m.
Note: Originally described as Hymedesmia sp. D. The species appears to belong in the subgenus Stylopus (cf. Hooper & Van Soest, 2002).
[B] GO TO PAGE 117
Strongyles absent.
Tylotes-Subtylotes present.
Acanthostyles of 1 size class.
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