Viewing: Molluscs

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

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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

Dec 16

December 16, 2014

Sepia officinalis © Sebastian Niedlich CC BY-NC-SA 2

New research shows shipping sound impacts cuttlefish

Cuttlefish become stressed when exposed to shipping sound and panic when exposed to loud, low-frequencies, according to two scientific papers published this year. The Marine Life Society of South Australia believes that these results should trigger increased research efforts into the impact of shipping noise on the Giant Australian cuttlefish aggregation at Point Lowly, near Whyalla in South Australia. They argue that the matter... Read more

Posted in Acoustics, Cephalopods, Marine invertebrates, Molluscs, Pollution | By

Oct 7

October 7, 2014

cuttlefish and purple sea urchin at Point Lowly by Dan Monceaux

Aristotle’s lantern and other ‘invertebrate bits’ by Heather Robertson

Heather Lynn Robertson/Stoker writes a blog on marine invertebrates entitled Aristotle’s Lantern. As the title of her blog suggests, Heather seems to be particularly keen on sea urchins. In her own words, “Aristotle’s lantern… is a hard, calcareous feeding structure comprised of very intricate parts unique to sea urchins.” Here is a small excerpt from one of Heather’s recent blog... Read more

Posted in Cephalopods, Cnidaria, Coral, Creative writing | By

Oct 2

October 2, 2014

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

Marine Life Society of South Australia slams cuttlefish acoustic impact study

The Marine Life Society of South Australia has condemned a recent study into the potential impact of shipping noise on the Giant Australian Cuttlefish aggregation claiming that the study is scientifically flawed and does not prove that shipping has not adversely affected the population. The Society is concerned that the report may be used to justify the approval of the... Read more

Posted in Acoustics, Cephalopods, Marine Protected Areas, Pollution | By

Sep 24

September 24, 2014

The carbon footprint of dive tourism – are we loving our oceans to death?

It is with mixed feelings that I frequently see people I know raving about their next dose of international ecotourism, be it diving with whales in Tonga or on tropical reefs in any of our Pacific island neighbours’ waters. On the one hand, I respect my peers enthusiasm for diving, for exploring the natural world and for seeking out intimate experiences... Read more

Posted in Climate change, Coral, Crustaceans, Molluscs, Pollution, Stormwater | By

Aug 6

August 6, 2014

Western Blue Groper

Evolutionary biologist Professor Steve Donnellan’s ‘Wild lives of wildlife’

Several members of the Marine Life Society of South Australia attended a talk hosted by Butterfly Conservation SA last night. The guest speaker was Professor Steve Donnellan from the South Australian Museum’s Evolutionary Biology Unit, who led us on a curious tour through the sexual hardware of a wide range of terrestrial, avian and marine species. Diversity was the order of the... Read more

Posted in Cephalopods, Molluscs, Whales & Dolphins | By

Jul 22

July 22, 2014

How Jeanette Power’s 19th century argonaut studies in aquaria led to a modern day paper

A PhD student called Julian Finn contacted us in 2006 seeking some information about Jeanette Power. Julian said that Jeanette Power was famous for resolving the truth that argonauts build their own shells. Julian is now Dr Julian Finn, Senior Curator of Marine Invertebrates for Museum Victoria. Back in 2006 he requested copies of some papers regarding Jeanette Power for... Read more

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Jul 9

July 9, 2014

Uncommon Smooth Crassatella (Giant Cockle) found at Brighton, SA

On 3rd July 2014, Society member David Muirhead found a single half of a ‘Giant Cockle’ valve (105mm max diameter) in a sand dune cutaway at Brighton beach, South Australia. David took a series of photographs of the specimen, including the following images: – The half valve with brown adductor scars   According to David, the ‘Giant Cockle’, Eucrassatella donacina,... Read more

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Jun 4

June 4, 2014

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

Underwater photographers focus on Whyalla’s biodiversity

This long weekend, divers and snorkelers from Adelaide and Whyalla will unite to explore and photograph the biodiversity of Upper Spencer Gulf. The Whyalla Underwater Shootout will encourage young and old to explore the region’s rocky and artificial reefs, sandy bottoms, sea grass meadows and mangroves to show that there’s more to Whyalla’s waters than the Giant Australian Cuttlefish aggregation.... Read more

Posted in Cephalopods, Citizen Science, Events | By