Coral Sea Expedition Yields 110+ New Species, With Taxonomic Count Potentially Exceeding 200
A 35-day deepwater research voyage in the Coral Sea has yielded more than 110 new fish and invertebrate species — a figure scientists believe could exceed 200 as specimen identification continues through genetic testing and taxonomic review.
The specimens were collected late last year by scientists aboard CSIRO research vessel (RV) Investigator during a voyage that departed Brisbane last October. The ship travelled as far as Mellish Reef, approximately 1,000km off the Queensland coast, sampling waters between 200 metres and 3km deep within the Coral Sea marine park — Australia’s largest marine protected area.
The expedition was a collaboration between CSIRO, Australia’s national science agency, and The Nippon Foundation-Nekton Ocean Census. Dr Will White, a shark expert and the CSIRO voyage chief scientist, said the expedition set out to learn more about the area’s deepwater biodiversity, for which there was “very limited data.”
Taxonomic Workshops and Species Confirmation
Specimens collected on board were subsequently identified during what White believes were “likely the largest taxonomic workshops of marine animals ever undertaken in Australia.” The new-to-science species catalogued so far include brittlestars, crabs, sea anemones and sponges.
A critical distinction in the ongoing identification process is the difference between morphological and molecular confirmation. Dr. Claire Rowe, the marine invertebrates collection manager at the Australian Museum, said invertebrate specialists on board the Investigator photographed and took tissue samples of the newly collected animals. She noted that many invertebrates, including jellyfish, were cryptic — difficult to identify based on physical characteristics alone. Scientists were conducting further genetic testing from the tissue samples to confirm what collected specimens were new to science.
“There does look like there’s some new species of anemones, which is quite exciting,” Rowe said.
Other Notable Discoveries
White himself identified four new species — a new skate, ray, deepwater catshark and chimaera — also known as a ghost shark. Each offers insight into the taxonomic gaps that persist in deep-sea classification.
The ray species, found on the Kenn Plateau about halfway between Australia and New Caledonia, was a type of stingaree in the genus Urolophus. “They’ve got a relatively long tail but then they’ve got a caudal fin at the end,” White said.
The new deepwater catshark, placed in the genus Apristurus, was a tropical species. “They’re very dark-bodied, they’re almost flabby – truly deepwater things, very slow moving, [with] lots of little teeth,” White said.
White also described a new chimaera — a type of animal related to sharks and rays, which have cartilaginous rather than bony skeletons. The animals have a “rat-like tail, quite a plump nose, and a big spine above the dorsal fin.”
Why It Matters
Samples from the voyage have been shared around the country, held in collections including at the CSIRO, the Australian Museum and state museums — establishing a distributed institutional framework for ongoing taxonomic study.
Rowe emphasized the urgency underlying such marine expeditions, noting that “so little is known about the deep sea.”
“It’s such an unexplored area, and with so many threats to our ocean, such as overfishing and climate change and deep sea mining, we need to understand what’s out there before it’s lost,” she said.
That urgency is underscored by changing conditions in the survey region itself. The Coral Sea is almost half a degree warmer than it was 30 or 40 years ago, climate scientists say. The sea surface temperatures there over both the last summer and calendar year have been the hottest on record.
With potentially 200 or more species awaiting formal description, the taxonomic work emerging from this single expedition represents a significant expansion in the documented biodiversity of the deep Coral Sea.
This article was created by content specialists using various tools, including AI.
This story was originally published March 31, 2026 at 2:00 PM.
