Identifying Sponges

Key to California Porifera (Page 146)

( From page 145 A) Diacts are Strongyles to Tylotes (some may look like Styles with microspined heads).
Megascleres with microspined heads.
Tedania (Tedania) sp. A (Green & Bakus, 1994)
Sponge: Tubular. Consistency: fragile. Surface: smooth. Oscula: not visible.
Color: Tan. ? Alive.
Spicules: Megascleres: (1) Strongyle-Styles with microspined heads: 240 -266-300- 345 um. x 8 - 9- 10 um. (2) Tylotes: 160 -196-211- 236 um. x 4 -5- 5 um. Microscleres: (1) Onychaetes (Microspined Microxeas): 49 -57- 65 um. x 2 -3- 3 um. (2) Onychaetes: 135 -168- 208 um. x 2 -3- 3 um.
Skeleton: Ectosome: Thin dermis with Tylotes. Choanosome: Strongyles in tracts and singly; Onychaetes occur in bundles.
Distribution: Southern California.Santa Maria Basin.
Depth: Deep water, 92-100 m.
Note: Strongyles apically asymmetrical and may be confused for Styles. See pg. 113 A. Was Tedanione sp. A.
Megascleres without microspined heads.
Tedania (Trachytedania) toxicalis de Laubenfels, 1930
Sponge: Massive to 3 cm high. Consistency: soft, fragile. Surface: superficially smooth with numerous "cavities". Oscula: not readily made out because of the presence of these cavities.
Color: Alive: brownish-red, Preserved: Pale drab.
Spicules: Megascleres: (1)Styles - Subtylostyles (occasionally with small spines): 212 -230- 255 um. (2)Tylotes - Subtylotes: 181-194- 224 um. (see note). Microscleres: (1)Originally described as having Rhaphides: 150 um. x 0.67 um. (2)but has Onychaetes of two sizes: 60 um. x 0.75 um. (3)Onychaetes: 180 um. x 1.8 um.
Skeleton: Ectosome: Fleshy dermal membrane with tangentially placed Tylotes -Subtylotes. Choanosome with spicules in confusion and a few vague tracts.
Distribution: Central California.
Depth: Intertidal.
Note: Onychaetes not shown. There are extreme diferences in spicule sizes which range from those given above to those of Hartman, 1975 [Styles Mean 300 μm, Tylotes Mean 220 μm and two size classes of Onychaetes]. T. toxicalis was synonymized with Kirkpatrickia topsenti by Bakus, 1966, which was in error.
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