Identifying Sponges

Key to California Porifera (Page 198)

( From page 197 A) Microscleres do NOT include Forceps; Sigmas of 1 size class.
[A]
Arcuate Isochelae of 2 size classes.
Styles-Acanthostyles of 1 size class.
cc198A.jpg
Lissodendoryx (Lissodendoryx) sp. 1 [of Lee]
Sponge: Encrusting to 2 cm. Surface: granular to superficially smooth. Oscula: with tiny rims, less than 1 mm across.
Color: Alive: Gold, cinnamon brown, yellow, buff.
Spicules: Megascleres: (1) Styles-Acanthostyles: 149 -182-190- 210 um. x 5 -8- 10 um. (2) Tylotes -Subtylotes: 135 -168-182- 200 um. x 3 -4- 5 um. Microscleres: (1) Arcuate Isochelae: 11 -13-17- 21 um. (2) Arcuate Isochelae: 19 -27-31- 41 um. (3) Sigmas: 19 -27-31- 39 um.
Skeleton: Ectosome: Dermal membrane under which are thick palisades of Subtylotes, mostly perpendicular to the surface. Choanosome: Thick, dominant reticulation of bundles of 3-5 Styles- Acanthostyles. Tracts only occur very near the palisades of Subtylotes.
Distribution: Central California.
Depth: Deep water.
Note: Easily confused with Lissodendoryx firma. Could be a variant of that species.
[B]
Arcuate Isochelae of 1 size class.
Acanthostyles of 2 size classes.
Hymedesmia (Hymedesmia) sp. Klontz, 1989
Sponge: Thinly encrusting to 1-2 mm thick. Oscula: When alive, oscules pronounced but almost disappear on fixation.
Color: Alive: Orange.
Spicules: Megascleres: (1)Acanthostyles: 96 -115-124- 136 um. x 6 -8-9.2- 12 um. (2)Acanthostyles: 176 -318-384- 496 um. x 6 -10-13- 16 um. (3)Subtylotes: 184 -235-273- 336 um. x 4 - 6-8- 10 um. Microscleres: (1)Arcuate Isochelae: 25 -28-31- 35 um. (2)Sigmas: 27 -50-58- 61 um.
Skeleton: Ectosome: Dermal membrane with microscleres. Choanosome: Acanthostyles with heads buried in basal spongin and Subtylote tracts to surface.
Distribution: Deep water.
Depth: Central California.
Note: Originally described in the subgenus Ectyodesmia which is no longer valid. Measurements taken from four specimens.
START 001 002