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DISPLAYING POSTS TAGGED: octopus (2)

Catalogue of cephalopods completed

Author
by Kate C
Publish date
4 June 2014
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Comments (7)

Everyone loves a happy ending. And everyone loves octopuses. The recent completion of the third and final volume in the revised FAO Catalogue of Cephalopods of the World nails it on both fronts. 

Cephalopods of the World Volume 3 Cover of the new FAO Cephalopods of the World Volume 3.
Image: Emanuela D’Antoni
Source: Food and Agriculture Organization of the United Nations
 

This is a brilliant – and free – resource designed to assist people working in fisheries to identify the cephalopods that we humans are most aware of, namely the ones we've identified, that we eat, or can cause us harm. Volume 3: Octopods and Vampire Squids was co-authored by MV's Dr Mark Norman and Dr Julian Finn. They are also are two of the four series editors.

'Octopus’ berrima Spot the 'Octopus’ berrima in the sandy substrate! (The inverted commas signify that this species is provisionally placed in the genus Octopus.)
Image: Julian Finn
Source: Museum Victoria
 

Years of work and drawing from cephalopod researchers worldwide sees FAO Catalogue of Cephalopods of the World summarising descriptions of species for practical use by non-specialists. "We've distilled it down to diagnostic characters that will allow people on research or fishing vessels to identify species," says Julian. "It's a review of all the taxonomic work that's out there, for people who don't have immediate access to the literature." The species descriptions focus on traits that are easily measured, which is no mean feat for animals famous for changing their shape and form at will. Says Julian, "everything is based on characters that survive preservation and are consistent across members of a species, such as numbers of suckers, presence or absence of structures, and relative lengths of body components."

Julian and Mark also note that this project would not have been possible without significant financial and moral support from the Australian Biological Resources Study and the Hermon Slade Foundation. This allowed them to do the work on octopus taxonomy that was required for this new edition of the Catalogue. 

Argonauta argo The beautiful female Argonaut, or Argonauta argo.
Image: Julian Finn
Source: Museum Victoria
 

So, if you have an interest in, as Ze Frank calls them, 'the floppy floppy spiders of the sea', head to FAO and download a free copy of FAO Catalogue of Cephalopods of the World Volume 3 (PDF, 25.77Mb). And in case you need a reminder about why you love octopuses, here's a video showing how they can open jars from the inside (while we humans sometimes struggle to open them from the outside).

 

Octopus on dry land

Author
by Kate C
Publish date
24 November 2011
Comments
Comments (1)

A YouTube video, Octopus Walks on Land at Fitzgerald Marine Reserve is doing the rounds at the moment and generating a bit of online discussion about this fascinating behaviour.

Dr Julian Finn filmed a similar event in Broome a few years back where a small, unnamed octopus (Abdopus sp.) crawled between rock pools at low tide. He says that it's not uncommon for intertidal octopuses to roam between pools in hunt of prey such as crabs or fish. They may also flee their tide pool to escape the attention of bigger, hungrier octopuses! In this video, he explains more about these terrestrial adventures.

 

Watch this video with a transcript

Like all cephalopods, octopuses breathe through gills and won't survive for long out of water. Julian has only seen octopuses crawl over dry land where the chance of them being trapped out of water is minimal. In captivity, it's not unknown for octopuses to turn up in strange places after breaking out of their tanks – including one that was found in a staircase!

Links:

MV Blog: Blue-ringed octopus project

MV News: Argonaut buoyancy

MV News: Tool use in Veined Octopus

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