SCUBA News 227
(ISSN 1476-8011)

SCUBA News (ISSN 1476-8011)
Issue 227 - May 2019

Welcome to SCUBA News - thanks very much for subscribing. We've a 10% off diving coupon for you today, courtesy Argentari Divers in Italy, new species of nudibranchs described and all the underwater news.

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What's new at SCUBA Travel?
Featured Liveaboard - Manta Expedition
Creature of the month: New species of nudibranch
Diving news from around the World

Argentario Divers, Tuscany, Italy

Argentario Divers - Italy diving
Enjoy the best Tuscany life-style combined with stunning diving in the Archipelago Toscano Marine Park, with incredible wrecks, cavern, drop off in the best diving spots of the Mediterranean Sea
10% off published prices, use code ScubaTravelUK2020 at

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What's New at SCUBA Travel?

Coron Wreck

Coron - Best Wreck Diving in Southeast Asia

In 1944 a squadron of US Helldiver bombers attacked and sank a fleet of Japanese ships in Coron Bay, the Philippines. Very well preserved, penetrable and covered in coral - a must for wreck enthusiasts.
Read More…

Fjiordia nudibranch, Isle of Man

Nudibranch Heaven in the Isle of Man

There are over 50 species of nudibranch living around the Isle of Man in the Irish Sea, including a new species described just this month (and detailed below).
Read More…

Silky shark in Cuba

Beneath Cuban Seas

Nearly 100 of the world's 500 shark species are found around Cuba plus the coral reefs, sea grass beds and mangroves are amongst the most intact marine ecosystems in the region.
Read More…

Featured Liveaboard - EcoBlue

$150 off Manta Expedition

Ecoblue liveaboard

Save on July, August and September manta expeditions.

Learn More…

Creature of the Month: Trinchesia cuanensis nudibranch, a new species!

Trinchesia cuanensis nudibranch taken in the Isle of Man by Tim Nicholson
Trinchesia cuanensis. Photo credit: Tim Nicholson. Taken on Garden Rock, Isle of Man.

Just this month the nudibranch above has been declared a new species.

In a paper published 1 May, nudibranch experts showed that the sea slug Trinchesia caerulea - first described in 1804 - is actually four different species, three of which are new.

Divers searched for what were thought of as Trinchesia caerulea around Europe - in the UK, Ireland, Norway, Sweden, Spain, Italy, France, Croatia and Russia. Even though the European nudibranch fauna is one of the best studied in the world, after detailed analysis of the specimens the scientists declared three new species.

Trinchesia cuanensis has so far only been found in the UK, Ireland and Sweden. T. diljuvia appears to be is unique to the Black Sea whilst the third new species, T. morrowae, lives in the Mediterranean.

You might find the Trinchesia cuanensis nudibranch at depths of between 10 and 20 m in stony areas. Occasionally you might see one at just 1 or 2 metres. The animal grows to 15 mm long and has up to ten rows of cerrata (the projections along its back). These cerrata have a band of orange or yellow at the top, preceded by a blue band. You can tell T. Cuanensis from T. caerulea by the third band of colour at the base of the cerrata. In T. cuanensis it is dark grey or black whilst in T. caerulea it is much paler.

The new northern species was named after Lough Cuan, an alternative name for Strangford Lough in Northern Ireland, where many marine biological studies have been undertaken over the past 100 years.

Animalia (Kingdom) > Mollusca (Phylum) > Gastropoda (Class) > Opisthobranchia (Subclass) > Nudibranchia (Order) > Trinchesiidae (Family) > Trinchesia (Genus)

Further Reading

Multilevel fine-scale diversity challenges the 'cryptic species' concept. Tatiana Korshunova et al. Scientific Reports 9, Article number: 6732 (2019)

Diving News From Around the World

Our round up of the best underwater news stories of the past month. For breaking news see our Twitter page or RSS feed


New artificial reef technology aims to restore marine environments
Helping protect vulnerable fish stocks and other marine species whose habitats are at risk.

Diver putting lifting bags on discarded fishing net

Divers dredge up two tons of disused nets from Greek seabed
Greek and Dutch divers have removed two tons of discarded plastic fishing nets from the seabed in northern Greece. The nets will be recycled into yarn to create products like socks, sportswear, swimwear and carpets.

Humpback whale calf

Humpback whale nursery forms off Australia's Gold Coast, surprising experts
South East Queensland waters used to be a pit stop on the humpback migration highway, but marine experts say the region is becoming a whale nursery. Female whales have traditionally given birth in areas along the Great Barrier Reef, but researchers have noticed a shift 1,000 kilometres south

Sea urchins

Sea Urchins Stress Out
Handling and tagging an urchin for research can impair its ability to avoid predators.

Underwater Indonesia

Indonesia creates three marine protected areas within Coral Triangle
They span a combined 226 square kilometers (87 square miles) around the islands of Sula, Rao and Makian in the Morotai archipelago.

Smoking chimney

Humans and volcanoes caused nearly all of global heating in past 140 years
New study confirms natural cycles play little role in global temperature trends and tackles discrepancies in previous models

Fish fence

Fish fences across the tropical seas having large-scale devastating effects
Fish fences so large they can be seen from space are causing habitat destruction

Manta ray

Manta Rays and Whale Sharks in Hanifaru Bay, Maldives
At any time there could be over a hundred mantas and several whale sharks feeding off the coral reef - the world's largest feeding station.

SCUBA News is licensed under a Creative Commons Attribution 4.0 Unported License. This means we are happy for you to reuse our material for both commercial and non-commercial use as long as you: credit the name of the author, link back to the SCUBA Travel website and say if you have made any changes. Some of the photos though, might be copyright the photographer. If in doubt please get in touch.

Photo credits: Tim Nicholson, Jill Studholme, Nick Hopgood, Dan Shapiro

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