Identifying Sponges

Key to California Porifera (Page 012)

( From page 011 A) Sponge surface usually smooth and with No nipple-like protuberences or papillae.
Megascleres distinct Tylostyles only, OR may ALSO contain Strongyles and Tylostrongyles
[A] GO TO PAGE 013
Tylostyles < 1000 μm.
Sponge not branched, or with a cylindrical stem and clavate terminations.
Surface variable.
Note: See page 19 for an additional, poorly described and unidentified, species reported from California which might fall into this category.
Tylostyles to 1320 μm.
Sponge branched, cylindrical stem with enlarged clavate terminations. Surface smooth with NO nipple-like protuberances.
Rhizaxinella gadus (de Laubenfels, 1926)
Sponge: Branched cylindrical stem with enlarged clavate terminations 30 cm high, lobes 2 cm in diameter, 10 cm long. Surface: superficially smooth. Oscula: rimmed, 1.5 to 2.0 mm.
Color: Preserved: White.
Spicules: Megascleres: (1)Tylostyles: 200 - 1320 um. x 10 - 50 um.
Skeleton: Ectosome: 1.5 to 2 mm thick, cartilaginous, bluish white. Densely packed with spicules perpendicular to surface, points outward. Stem brown central axis of dense longitudinal spicules. Choanosome: With few large spicules.
Distribution: Central California.
Depth: Subtidal.
Note: Was Suberites gadus.
START 001 002