The identity of two tubularian hydroids from Australia with a description and observations of the reproduction of Ralpharia magnifica gen. et sp. nov

Abstract

stuarine species and an important component of the summer fouling communities in Australian ports. T. ralphi has been recorded under various synonyms The identity of two common Australian tubularian hvdroids is established. Tubularia ralphi Bale is Honorary Associate. Invertebrate Zoology. National Museum of Victoria. Abstract from southern Australia. Ralpharia magnifica gen. et sp. nov. is described. It is a widely, although sparcely distributed species on shallow oceanic and sheltered water reefs in southern Australia. It has formely been confused with T. ralphi Bale. Ralpharia releases a free-swimming, short-lived medusa with 4 tentacle knobs and 4 radial canals. Nematocyst tracks are absent. The amoeboid egg, growth of the actinula and late development of the oral tentacles of the young hydranth indicate a close relationship with the primitive Athecata.