Viewing: Molluscs

May 22

May 22, 2017

Nudibranch name change

According to the web page found at http://www.urgdiveclub.org.au/scientific-names-do-change/ , “two-part scientific names contain a hierarchy which can change if an organism is re-classified”. I wrote about this topic in my article titled “Changes to Seastar Names” at http://mlssa.org.au/2010/10/07/changes-to-seastar-names/ . It can be difficult for ‘hobbyists’ such as ourselves to keep up with the changes for projects such as our Photo... Read more

Posted in Marine invertebrates, Molluscs, Nudibranchs | By

Mar 25

March 25, 2017

FURTHER DISCOVERIES AT THE SHIP’S GRAVEYARD

In addition to my recent discovery of an Oyster Blenny at the Ship’s Graveyard in the North Arm of the Port River, I also found this bivalve mollusc shell there: – I checked it out further when I got home. I thought that it was a Venus shell, Tapes literatus. I photographed it with my mobile phone at home and... Read more

Posted in Bony fishes, Invasive species, Marine invertebrates, Molluscs | By

Nov 27

November 27, 2016

The Predatory Behaviour of an Eleven-armed Star Fish

During our recent dive at Rapid Bay jetties, I recorded a large eleven-armed star fish attacking an abalone. I have to admit that I set the whole thing up though. I was swimming along the side of the new jetty’s piles when I came across this abalone at the base of a jetty pile. It was attached to a small... Read more

Posted in Marine invertebrates, Molluscs, Seastars | By

Oct 26

October 26, 2016

Bernard C. Cotton – former Curator of Molluscs at the SA Museum

Bernard C. Cotton was a Curator of Molluscs at the SA Museum in North Terrace, Adelaide, South Australia. According to “Australia’s Spectacular Cowries” by Barry Wilson and Peter Clarkson (mlssa 1069), Bernard “wrote many scientific papers and semi-technical articles on southern Australian molluscs.” According to “Kingdom of the Seashell” by R.Tucker Abbott, Bernard wrote three volumes of a South Australian... Read more

Posted in Achievements, Molluscs | By

Sep 8

September 8, 2016

What Is CIGESMED for Divers?

In November 2013, I hosted Vasilis Gerovasileiou from Greece during his visit to South Australia. We only managed one dive together though. We managed a dive at Rapid Bay jetty on16th November 2013. Vasilis had only brought a 5mm wetsuit with him for his dives in Australia. This suit probably served him well for dives in WA & Queensland, but... Read more

Posted in Citizen Science, Marine invertebrates, Molluscs, Research, sea urchins | By

Jun 6

June 6, 2016

Large Octopus Beach-washed at Petrel Cove

We recently received an email message reading “Howdy! I found this Octopus washed up at Petrel Cove and I can’t figure out what species it is. I estimate its leg span to be about 1.5m. Annelise Johnson” The message was accompanied by this photo of the beach-washed octopus: – Our reply to Annelise was: “Hi Annelise, That’s a beauty! The... Read more

Posted in Cephalopods, Molluscs | By

Feb 4

February 4, 2016

Warning of hefty penalties for reef picking

That heading comes from PIRSA as part of a warning to fishers regarding rules for removing organisms  from intertidal reefs in SA. Reef Watch says that it gets quite a few reports from members of the public who have observed people taking organisms off intertidal reefs. The taking of marine organisms from intertidal reefs was banned along the shore of Gulf... Read more

Posted in Coastal activities, Coastal species, Conservation, Fisheries, intertidal zone, Marine invertebrates, Marine Protected Areas, Molluscs, Regulation | By

Mar 19

March 19, 2015

Alan Paskett - Sepia apama, Black Point, 3-4m June 2014

Cuttlefish of South Australia

Before I embarked on the production of the documentary film Cuttlefish Country, I had little appreciation of the diversity of cuttlefish species which are found in South Australian waters. When I discuss cuttlebones with friends or strangers, I’m usually met with surprise at the revelation that cuttlebones found in beachwash along the South Australian coast represent not one, not two but several species... Read more

Posted in Cephalopods, Marine invertebrates | By

Feb 14

February 14, 2015

Scientists studying the mating tactics of giant Australian cuttlefish

When giant Australian cuttlefish, Sepia apama, mate, they meet head-to-head and embrace. The male uses a specialised arm to squirt his sperm in to the mouth of the female. There is some short video footage by Roger Hanlon from the Marine Biological Laboratory in Woods Hole, Massachusetts available. According to that same web page, “To initiate sex, a male spreads... Read more

Posted in Cephalopods | By

Jan 4

January 4, 2015

Black Cowry (Zoila friendii thersites) at Port Noarlunga - Dan Monceaux

Black Cowry (Zoila friendii thersites)

Yesterday, while snorkeling at the Port Noarlunga reef in near perfect conditions I was fortunate enough to encounter a South Australian endemic gastropod mollusk, the Black Cowry (Zoila friendii thersites). The animal I sighted was perched quite conspicuously on a large yellow/orange sponge in about three metres of water. I later discovered that a photograph taken by Greg Adams of one in... Read more

Posted in Marine invertebrates, Marine Protected Areas, Molluscs, Pollution | By