Historical reference: Do not rely on this information. It is very old. About this collection
Siphonozooids, those individuals in an Alcyonarian (q.v.) which are much simpler in structure than the normal individuals (autozooids). They have no tentacles or retractive muscles, and are without reproductive organs. Among the Alcyonaria they occur in the Helioparidae or Blue Corals, Pennatulidae, and in some Alcyonidae.