Nine species of athecate hydroids collected in two surveys in the Northern Territory of Australia include a new species of Ralpharia Watson, 1980, and a new record of Corydendrium parasiticum (Linnaeus, 1767) from Australia. Other species in the collection are known from warm temperate to tropical world regions including Western Australia and Queensland, the Timor Sea and Torres Strait.
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Jeanette E. Watson (2000) studied this question.
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