Remotely Operated Deep Sea Vehicle Explores the Ocean’s Depths

Three new species of sea cucumber have been discovered by Museum Victoria scientists almost a thousand metres beneath the surface of the ocean.  The sea cucumbers were discovered on a British-led expedition for new life on seamounts and hydrothermal vents 1500 kilometres  (940 miles) south of the island of Madagascar.  The project involved more than twenty international marine engineers and scientists, including Museum Victoria marine biologists Mark O’Loughlin and Melanie Mackenzie.

Sea Cucumbers

Commenting on the deep sea exploration mission, O’Loughlin stated:

“We were able to describe three species of sea cucumber totally new to science.  New technology provided the very rare opportunity to publish colour photos of the new species for fellow scientists.”

The identification of the sea cucumbers was made possible by the expedition’s remotely operated vehicle, or ROV, a remote-controlled robot capable of traversing the ocean floor, collecting samples, and taking video and photographs.  Operators back on the ship control the ROV’s robotic arm, guiding it to collect specimens as they appear on a video screen.  Samples are then sorted and preserved by the scientific team as part of this marine study.

The Echinodermata

Sea cucumbers belong to the phylum called Echinodermata which also includes sea urchins, crinoids and starfish.  Sea cucumbers are a very ancient marine animal, so named as their elongated bodies superficially look-like a cucumber in appearance, although our team members at Everything Dinosaur can find no resemblance themselves.  These animals probably evolved in the Cambrian but their fossil preservation potential is relatively poor and very few fossil specimens have been found when compared to other members of the Echinodermata.

Melanie Mackenzie added:

“Specimens often lose their colour during the preservation process, so by the time they’re back at the lab, they look completely different.  The ROV allows us to not only access new environments and take samples, but also to take video and photographs of animals in their natural environments.”

Small Remote Operated Vehicle

The ROV is about the size of a small, family car  and can work at depths of up to six kilometres (over three and a half miles), opening up a whole new world for scientists.  But while the ROV is useful in exploring new environments, O’Loughlin insists that it is just one of many research tools available to marine scientists.

He stated:

“You still need the scientific expertise to interpret what you find down there, which is what we brought to this collaboration.  We’re proud to belong to a global community of such esteemed institutions.”

The project was led by Professor Alex Rogers (Oxford University) and funded through a grant from the UK-based Natural Environment Research Council.  The three new sea cucumbers will be housed at the British Museum of Natural History (London) for future research.

Australian scientists will soon have greater access to ROV technology, with the Marine National Facility’s new research vessel called “Investigator” due to be launched this year.

Everything Dinosaur acknowledges the support of Museum Victoria in the production of this article.

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African Crocodile Diversity Just Gets More and More Complicated

It seems that today’s extant reptiles have still got a lot to teach us about their phylogeny and taxonomic relationships as a team of scientists studying crocodiles in central Africa have discovered a new species of these ancient creatures.  According to a scientific paper published in the academic journal “The Proceedings of the Royal Society B (Biology)”, the rare Slender-snouted crocodile (Mescistops cataphractus) is actually two species and these two species diverged from each other at least seven million years ago.

Slender-nosed Crocodile

An analysis of molecular data and genetic samples provided the University of Florida team, who working in collaboration with scientists from Gabon, with the evidence to suggest that there are two distinct species present in the central African crocodile population.

A New Species of Slender-nosed Crocodile May Have Been Identified

New species of crocodilian discovered.

Picture credit: Matt Shirley

Describing how the discovery was made, lead author of the paper Matthew Shirley stated:

“It was simply a matter of going to places people before us never wanted to go or thought possible to go.”

African Crocodiles

This part of Africa had been beset with civil war, local militias and lack of infrastructure, the sites where Slender-nosed crocodiles could still be found were remote and very difficult to get access to.

Post doctorate researcher Shirley and his team have not only identified two genetically different species, but they have noted anatomical and physical differences too.

The researcher explained:

“There were actually two different species of Slender-snouted crocodile, as well as one sub-species, described in the past.  Over the years these were all synonymised with Mecistops cataphractus, but we are now faced with the necessity of determining if any of these previous names is equally applicable to the new taxa.”

When it comes to the scientific names of organisms, any binomial name attributed in the past may take precedence, it will be a question of trawling through the archives to see if such a name exists.  This new discovery has very important implications for the conservation of these small, Africa crocodiles.  The split between the two species suggests that the West African Slender-nosed crocodile is on the verge of extinction.

Matthew Shirley commented on how vulnerable to extinction these crocodiles are:

“Over the past eight years of effort I and others have detected less than fifty Slender-snouted crocodiles in the wild in West Africa, and of these less than seven were adults, compared to nearly 2,000 in Central Africa over the same time period and survey effort.  We recently evaluated its status for the 2014 IUCN [International Union for the Conservation of Nature] Red List and found that it is Critically Endangered making it one of the top crocodilian conservation priorities globally along with  the decline of Gharials, Siamese and Orinoco crocodiles.”

Critically Endangered Crocodiles

The research team called for drastic measures to help these critically endangered crocodiles.  It has been suggested that captive breeding programmes should be introduced with what crocodiles left in the wild being captured and put into zoos to permit the population to be boosted before any animals bred in captivity are released back into the wild.

Recently, crocodiles native to the African continent have gone through a considerable taxonomic revision.  Up until recently only three species of crocodilian were recognised in Africa, the very dangerous Nile crocodile (Crocodylus niloticus), the Slender-snouted nosed crocodile (Mescistops cataphractus) and the Dwarf crocodile, also often referred to as Broad-snouted crocodile (Osteolaemus tetraspis).  Studies (also involving staff from Florida University), have suggested that there are two distinct Nile crocodile species, and three, genetically different types of Dwarf crocodile.

If the scientific community recognises all of these new species then the species count for Africa will jump from three to seven.  These changes will mean a re-evaluation of total crocodile numbers in the wild and will have implications for future crocodilian conservation.

The scientific paper: “Rigorous approaches to species delimitation have significant implications for African crocodilian systematics and conservation” by Matthew H. Shirley, Kent A. Vliet, Amanda N. Carr and James D. Austin published in the Proceedings of the Royal Society B.

Crocodilian Alert in Hampshire

There may be plenty of rumours of “Big Cats” lurking around some of the more remote parts of the British countryside, but a crocodile in a Hampshire lake is a new twist on all those strange sightings of wild animals.  However, for one fisherman, he may well have encountered a two foot crocodile, one that was lurking in the water and ready to snatch fish from the line as the quarry was reeled in.

Alan Pragnell, an experienced angler, was fishing from the banks of a lake near to Ringwood (Hampshire, southern England), when he had the strange encounter.  It may sound like a “fishy tale”, but we at Everything Dinosaur are aware that there are very probably a number of illegally kept exotic pets such as crocodiles in the UK and Alan could well be right.

Crocodile

Alan hooked a small roach, a freshwater fish that is common in England.  He was reeling in his catch when the mystery animal grabbed hold of the fish.  When the fish was let go, the animal was sitting right in front of him, claims Mr. Pragnell

In an interview, Alan stated:

“It was quite clear enough.  It was a matter of inches away, just lying there.  It was a crocodile”.

Not a Pike

Another species of fish, the Pike, sometimes called the Northern Pike (Esox lucius), is known to take fish in this manner, but Alan is convinced what he saw was no Pike.

Alan added:

“It was about two foot long.  I was looking at it in disbelief.  It had four legs and a tail.  It was there for about ten seconds and then sunk down into the depths.  I know pike. I know what I saw.”

Although Mr Pragnell survived the encounter, his catch was left “shredded” describing the poor fish as having several deep parallel slashes.  The incident took place in the summer and the local angling association, the Ringwood District and Anglers Association has been informed.

A Fisherman’s Tale?

There are many folk who might regard this as a bit of a “fisherman’s tale”, however, despite the derision that Alan has attracted, there may well be something in what he is saying.

Alan explained:

“I am as sure as sure is.  I’m 64 I have been fishing since I was six.  What would be the point in lying?  I reckon someone had it as a pet and just chucked it over the fence when it got too big.”

Such incidents although sounding bizarre to us, are becoming increasingly common in some parts of the world.  In the Northern Territory of Australia, Saltwater crocodiles do frequently take fish off angler’s lines.  These animals are also responsible for a number of attacks on local fisherman each year, sadly some of these attacks are fatal.

To read an article about an Australia fisherman’s encounter with a Saltwater crocodile: Aussie angler catches crocodile.

No Further Sightings

With no further sightings or evidence, the local angling association has closed the case.  Mr Peter Hutchinson, the club’s Vice President stated:

“Nothing’s been seen since and I’m sure that if was a crocodile it would have died during the winter because it was so cold.”

Well, Mr Hutchinson, I would not be too sure if I were you.  However, we agree about the sensible precaution of keeping the lake a secret, after all, nobody wants to attract would be crocodile hunters to the location.

Pets Abandoned by their Owners

Everything Dinosaur team members have reported on numerous occasions incidents where “pet” crocodilians have been abandoned by their owners.  In December 2011, we wrote a short article about a caiman being left outside an exotic pet shop in the West Midlands.

To read more about this story: Crocodiles Victims of the Economic Downturn.

It is very likely that there are a number of crocodiles, caimans, and alligators being kept illegally as pets in the UK.  These animals are smuggled into the country and sold in a shady underworld of exotic pet sales.  Depending on the species, crocodiles can grow very quickly and soon become exceptionally dangerous.

A two foot specimen may not be a man-eater, but it would still be capable of inflicting a very nasty bite and capable of taking a finger off.

There may be something in what Mr Pragnell says, terrapins have been spotted in and around a number of British lakes and ponds.  These animals are not native to our shores, but they have either escaped captivity or most likely have been released by thoughtless owners who no longer wanted to look after them any more.

Could There Be a Crocodile Lurking in a Hampshire Lake?

Crocodile (top) and Alligator (bottom).

As for any crocodile not surviving the winter, this is no guarantee, the American Alligator (Alligator mississippiensis) which is found in the south-eastern United States can tolerate freezing temperatures, at least for a short while.  All crocodiles are cold-blooded and if there was a particularly cold, prolonged British water it is likely that a large number of exotic reptile pets that had been released into the wild would die. However, if the winter was quite mild, the crocodile may well enter a period of dormancy, not feeding until the warmer weather.  A crocodile could survive into the spring under such conditions.

The Illegal Trade in Crocodiles

This weekend there was a report from the UAE of another illegally obtained baby Nile Crocodile (Crocodylus niloticus) being sold via a pet dealer in the local market.  The salesman claimed that as well as crocodiles, monkeys, chimpanzees and poisonous snakes even tiger cubs could be obtained – if the price was right!  We at Everything Dinosaur urge members of the public never to purchase any so-called exotic pets, not least without taking proper advice and checking to see if the sale would be legal in the UK.

For models and replicas of crocodilians and extinct archosaurs: Mojo Fun Prehistoric Life Replicas and Figures.