World’s First Randall’s Fairy Wrasse Collected By Cairns Marine

Joe RowlettBy Joe Rowlett 3 weeks ago
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Randall’s Fairy Wrasse (Cirrhilabrus randalli), from Flinders Shoal in the Timor Sea. Credit: LemonTYK

 
Cirrhilabrus randalli is essentially a book fish, and the species has never been (and probably will never be) collected for the aquarium trade due to its isolated and far-flung range.” –LemonTYK 
This was certainly a reasonable enough statement to make back in 2015 when Lemon and I reviewed this genus. After all, this elusive species was only known at the time from a handful of isolated oceanic reefs off the northwestern coastline of Australia, all of which remain protected from aquarium collection. But here we are, only three years later, and the first ever aquarium specimens of Randall’s Fairy Wrasse have just been collected. First, some history. Cirrhilabrus randalli was described in 1995 from the Rowley Shoals off Western Australia, and, in the years since, its natural range has been extended only slightly, inching upwards across the remote series of atolls—Scott, Seringapatam, Ashmore, Hibernia—that fringe the continental shelf. If you head north of this area, into the Lesser Sunda Islands of Indonesia, or east into the Timor Sea, you’ll find a close relative, still scientifically undescribed, known variously as the Banda Fairy Wrasse, the Dull-head Fairy Wrasse, or the Glow Fairy Wrasse. But apparently this isn’t always so… 

Males of this fairy wrasse complex possess species-specific florescent patterns, likely used in species recognition. Unlike most other Cirrhilabrus, this group is unknown to “flash” a visible nuptial coloration. Note that the yellow band is non-fluorescent, but still visible. Credit: LemonTYK

 
Cairns Marine recently opened a new collecting outpost in Darwin and set off on their maiden voyage out to the same shoals that brought us the Monsoon Fairy Wrasse (
C. hygroxerus) back in 2016. These same reefs are likewise home to large numbers of the undescribed Banda Fairy Wrasse, but, to everyone’s great surprise, intermingled amongst these were a precious few C. randalli. In total, just three specimens were collected from these seething labrid swarms, at depths ranging from 15-40 meters. It’s too soon to say whether there is actually a resident population of this species anywhere near Darwin or if these were simply waifs from further west. Aquarium collecting has been ongoing in this area for many years now, and these are the first specimens to ever appear. This might suggest that they’re a one-off occurrence here, similar to how Black Tangs and Nahacky’s Angelfish occasionally find themselves in Hawaii. In general, the currents around Northern Australia flow in a westerly direction, limiting the spread of Australia’s endemic species. The same phenomenon has helped to trap two others from this group, Cirrhilabrus morrisoni (replaced by C. hygroxerus in the Timor Sea) and “Conniellaapterygia. This latter species is one of the last remaining “book fish” found among the fairy wrasses, though it too may eventually be retrieved from the mesophotic depths around Northern Australia. 

Nursalim Flasherwrasse (Paracheilinus nursalim). The black band north of the anal fin is diagnostic for this species. This is likely a subterminal male, given the low number of dorsal filaments and the yellow (versus red) anal fin. Credit: LemonTYK

 
And as if this feat wasn’t impressive enough, Cairns Marine outdid themselves by catching what is likely another industry first… the Nursalim Flasherwrasse (
Paracheilinus nursalim). As the dramatic finnage suggests, this is a member of the filamentosus species complex and was initially described in 2008 as occurring only around Triton Bay, West Papua. It’s since been reported to the west at Ambon and further south in the Banda Sea, at the Kai Islands and Tanimbar Island, with this new record from the Timor Sea extending things further still. The reefs around Darwin are proving to be a fascinating location, where several distinctive faunas appear to intermix freely. Cirrhilabrus randalli is a prominent example of a western component at the edge of its range, while Paracheilinus nursalim represents a characteristic element from Eastern Indonesia. There are also some endemic fishes of Northern Australia, such as “Amphiprion milii”, which ranges westwards along the coastline. And, lastly, there is what may be a true endemic fauna in the Timor Sea, as seen with the Monsoon Fairy Wrasse. No doubt we can look forward to many more exciting finds from these remarkable waters. 

The the terminal males of P. nursalim are sensational. Credit: LemonTYK

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Joe Rowlett
About

 Joe Rowlett

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Joe is classically trained in the zoological arts and sciences, with a particular focus on the esoterica of invertebrate taxonomy and evolution. He’s written for several aquarium publications and for many years lorded over the marinelife at Chicago’s venerable Old Town Aquarium. He currently studies prairie insect ecology at the Field Museum of Natural History and fish phylogenetics at the University of Chicago.

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