Catalog number(s): USNM 23944 Subject: A, habitus from an underwater photograph (scale 10mm). B, cross section showing skeleton arrangement (scale 1mm). C, typostyles (scale 10 microns). D, large spirasters (scale 10 microns). E, small spirasters (scale 20 microns). Artist: Condit, Patricia Published: Ruetzler, K. 2002. Family Spirastrellidae Ridley & Dendy, 1886 (Order Hadromerida). In: Hopper, J. N. A. and R. W. M. van Soest (1). Systema Porifera. Kluwer Academic, Plenum Publishers, New York. Fig. 4
