Small pieces of colonial tissue (rachis) bearing one autozooid polyp and several siphonozooid polyps (also containing photocytes) were excised from unanesthetized colonies and placed individually in assay vials containing 150 [[micro]liter] of ASW.
In both autozooid and siphonozooid polyps, photocytes are clustered in specific locations of the endodermal layer where cells filled with highly refringent granules (presumably acting as diffuse reflectors for the light emission) predominate (Anctil et al., 1984; Awad and Anctil, 1994).
The polyps are dimorphic, featuring both autozooids and siphonozooids. Autozooids possess eight pinnate tentacles, which are completely retractile; siphonozooids are smaller in diameter, lack tentacles, and outnumber the autozooids (Fabricius and Alderslade, 2001).
Cross-sections of the Sarcophyton auritum polypary 2-3 mm below the surface featured a uniformly pale-turquoisestained coenenchyme, found between the autozooids (hereafter termed "polyps") and the siphonozooids (Fig.