FIERCE WARRIORS: CRABS

Look how epic this little guy is! 

He is a crab — and if you asked him, the fiercest warrior that ever lived. While that may not be strictly true, crabs do have the heart of a warrior and will raise their claws, sometimes only millimetres into the air, to assert dominance over their world. 

Crabs are decapod crustaceans of the Phylum Arthropoda. 

In the Kwak'wala language of the Kwakwaka'wakw of the Pacific Northwest, this brave fellow is ḵ̓u'mis — both a tasty snack and familiar to the supernatural deity Tuxw'id, a female warrior spirit. Given their natural armour and clear bravery, it is a fitting role.

They inhabit all the world's oceans, sandy beaches, many of our freshwater lakes and streams. Some few prefer to live in forests.

Crabs build their shells from highly mineralized chitin — and chitin gets around. It is the main structural component of the exoskeletons of many of our crustacean and insect friends. Shrimp, crab, and lobster all use it to build their exoskeletons.

Chitin is a polysaccharide — a large molecule made of many smaller monosaccharides or simple sugars, like glucose. 

It is handy stuff, forming crystalline nanofibrils or whiskers. Chitin is actually the second most abundant polysaccharide after cellulose. It is interesting as we usually think of these molecules in the context of their sugary context but they build many other very useful things in nature — not the least of these are the hard shells or exoskeletons of our crustacean friends.

Crabs in the Fossil Record

The earliest unambiguous crab fossils date from the Early Jurassic, with the oldest being Eocarcinus from the early Pliensbachian of Britain, which likely represents a stem-group lineage, as it lacks several key morphological features that define modern crabs. 

Most Jurassic crabs are only known from dorsal — or top half of the body — carapaces, making it difficult to determine their relationships. Crabs radiated in the Late Jurassic, corresponding with an increase in reef habitats, though they would decline at the end of the Jurassic as the result of the decline of reef ecosystems. Crabs increased in diversity through the Cretaceous and represented the dominant group of decapods by the end.

We find wonderful fossil crab specimens on Vancouver Island. The first I ever collected was at Shelter Point, then again on Hornby Island, down on the Olympic Peninsula and along Vancouver Island's west coast near Nootka Sound. They are, of course, found globally and are one of the most pleasing fossils to find and aggravating to prep of all the specimens you will ever have in your collection. Bless them.

CANADODUS SUNTOKI: 25-MILLION YEAR OLD FOSSIL FISH FROM SOOKE

A new genus and species of prehistoric fish have been named after a Vancouver Island collector who discovered a well-preserved fossil of the creature in Sooke.

The species named the Canadodus suntoki by Russian researcher Evgeny Popov is named after collector Steve Suntok who donated the fossil to the Royal BC Museum in 2014.

The name roughly translates to “tooth from Canada,” as the fossil is part of a fish dental plate.

Popov, who is one of the world’s leading experts on fossil holocephalian fishes, says that the fossil that Suntok found is an entirely new fish compared to anything found before.

“I knew it was something significant. Not necessarily a new species but something significant,” Suntok told CTV News Thursday.

The fossil dental plate indicates that the fish was likely a type of Chimaeridae, which is a species of fish that feeds on invertebrates by crushing their shells on its hard flat dental plates, before eating the animal inside, according to researchers.

Suntok found the fossil in a northwest portion of Sooke. Researchers say that Sooke is an excellent area for paleontological discoveries, with a variety of fossils at the Royal BC Museum coming from the region.

Ancient whale vertebrae and rib specimens have been found in Sooke and donated to the museum, as well as a potential terrestrial mammal bone, fossil leaves, and many invertebrate fossils, such as oysters, barnacles and snails.

The Suntok family has experience finding and preserving fossils on Vancouver Island. Many fossils discovered by the family have been donated to the Royal BC Museum, including a new waterbird coracoid bone which was named after Steve Suntok’s daughter, Leah, in 2015, named the Stemec suntokum.

“Because of erosion, every time we go there there’s something new,” said Suntok.

“New things get exposed so from time to time I go back just to check out the site. On this occasion, I found something I’d never seen before, which was pretty exciting.”

Researchers say that cliff faces near Muir Creek and beaches near Kirby Creek in Sooke “easily contain the richest exposures of fossils near Victoria.” Fossils in the area tend to date back approximately 25 million years.

Vancouver Island palaeontologist Marji Johns, who is a co-author of research on the Canadodus suntoki, says that she was thrilled by the discovery.

Sooke, British Columbia and Juan de Fuca Strait

Johns says that very few palaeontologists in B.C. and Canada are able to do fieldwork while conducting research and that volunteer collectors like the Suntok family are largely responsible for finding rare and usual fossils..

Suntok says that having the Canadodus suntoki named after him is a dream come true.

“I’m ecstatic about it. It’s the dream of every amateur collector,” he said.

“It’s an honour. I don’t deserve it, but I’m extremely appreciative of it.” 

Reference: 

https://www.iheartradio.ca/580-cfra/it-s-an-honour-newly-discovered-fossil-fish-species-named-after-vancouver-island-collector-1.13515837