SCUBA News 227
28 May 2019
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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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.
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.
Featured Liveaboard - EcoBlue
Save on July, August and September manta expeditions.
Creature of the Month: Trinchesia cuanensis nudibranch, a new species!
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 ReadingMultilevel fine-scale diversity challenges the 'cryptic species' concept. Tatiana Korshunova et al. Scientific Reports 9, Article number: 6732 (2019)
New artificial reef technology aims to restore marine environments
Divers dredge up two tons of disused nets from Greek seabed
Humpback whale nursery forms off Australia's Gold Coast, surprising experts
Sea Urchins Stress Out
Indonesia creates three marine protected areas within Coral Triangle
Humans and volcanoes caused nearly all of global heating in past 140 years
Fish fences across the tropical seas having large-scale devastating effects
Manta Rays and Whale Sharks in Hanifaru Bay, Maldives
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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