Unusual new zoantharian species is the first described solitary species in over 100 years

Unusual new zoantharian species is the first described solitary species in over 100 years
An individual polyp removed from the sand, with a semi-closed oral disk at the top that would extend out from the sand. The remaining portion of the polyp is anchored in the soft sediment. Credit: Takuma Fujii

A very unusual new species of zoantharian surprised Drs Takuma Fujii and James Davis Reimer, affiliated with Kagoshima University and University of the Ryukyus.

The scientists stumbled upon a solitary individual polyp while conducting SCUBA surveys around the southern Japanese island of Okinawa. They noticed that the creatures were buried almost completely in the soft sediment of the seafloor. It was only their oral disks and tentacles that were protruding above the surface.

Generally, most known zoantharians are colonial (hence their common name of 'colonial anemones'), and many dwell in shallow waters of subtropical and tropical regions, where their large colonies can be found on coral reefs.

However, these newly discovered polyps were not only leading solitary lives. They were also found to lack zooxanthellae, single-celled organisms that coexist in symbiosis with certain marine invertebrates, also typical for the majority of zoantharians.

The discovery of this unusual new species is reported in the open access journal ZooKeys.

Solitary zoantharian species, such as this one, are known from scant few reports, and only three species are described, all reported more than 100 years ago from the Indo-Pacific region. Overall, very little is known about the hereby studied genus Sphenopus.

Unusual new zoantharian species is the first described solitary species in over 100 years
The solitary zoantharian species Sphenopus exilis as it appears in its natural habitat. Only the open oral disk and tentacles appear above the sand. Credit: Takuma Fujii

The new species, named Sphenopus exilis, is much smaller than the other three Sphenopus species, with its polyps measuring approximately 3 cm in length. It is currently only known from two bays on the east coast of Okinawa Island.

Both of the bays where Sphenopus exilis is found are threatened by development, with one of the bays currently the center of controversy over a proposed American military base expansion and landfill.

"This report demonstrates how much more research is needed on these understudied ecosystems", stated lead author Dr. Takuma Fujii.

"The only reason this was discovered was that the right person was in the right place at the right time", added co-author Dr. James Reimer.

"Such research also shows how important it is to have specialist researchers participate in surveys—otherwise, we might be missing a lot of the biodiversity present in the marine realm simply because we don't know what we are looking at," he concluded.

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More information: Takuma Fujii et al, A new solitary free-living species of the genus Sphenopus (Cnidaria, Anthozoa, Zoantharia, Sphenopidae) from Okinawa-jima Island, Japan, ZooKeys (2016). DOI: 10.3897/zookeys.606.9310
Journal information: ZooKeys

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Citation: Unusual new zoantharian species is the first described solitary species in over 100 years (2016, July 25) retrieved 21 July 2019 from https://phys.org/news/2016-07-unusual-zoantharian-species-solitary-years.html
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