The Great Barrier Reef, which extends for over 2,300 kilometers (1429 miles) along the northeastern coast of Australia, is home to over 9,000 known species.There are likely many more—new discoveries are frequently being made, including a new species of branching coral discovered in 2017. This richness and uniqueness make the reef crucial for tourism and the Australian economy—it attracts.. The Great Barrier Reef (GBR) is the world's most iconic coral reef ecosystem, recognised internationally as a World Heritage Area of outstanding significance. Safeguarding the biodiversity of this universally important reef is a core legislative objective; however, ongoing cumulative impacts including widespread coral bleaching and other.

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Box jellyfish. Possibly one of the most dangerous marine animals of Australia's waters, the box jellyfish (Chironex fleckeri) derives its name from the box or bell shape of its body. Its 60 tentacles - equipped with millions of nematocysts, or stinging cells - extend from the body, and have the potential to inflict fatal stings to humans.. Jellyfish are classified as medusozoans, a subphylum within the phylum Cnidaria (Figure 1). The term jellyfish has also been used to describe the grouping of medusozoans with comb jellies (phylum Ctenophora) and thaliaceans (i.e., pyrosomes, salps, and doliolids; phylum Chordata, subphylum Tunicata, class Thaliacea, orders Pyrosomida, Salpida, and Doliolida) that outwardly resemble medusozoans.