Friday mystery object #296 answer

Last week I gave you this lovely little shell to try your hand at identifying:

mystery296

It’s a specimen that was given to the Dead Zoo recently by a regular contributor to the collections and it’s particularly interesting because it might be the first record of this species in Ireland (this is currently being researched for publication by the donor, so I won’t give away too much detail).

What I will say is that this is one of the reasons species identifications can be very important, since our understanding of how species move around has implications for various aspects of society and you don’t want to make decisions based on bad information. If you don’t know what I mean by that, I’ll give you some examples.

Zebra mussels arrived in Ireland in the 1990s from the Black and Caspian Seas and they’ve bred prolifically. They altered freshwater ecosystems by filtering out plankton that other species depend on for survival and they form hard-to-remove clusters that foul boat hulls and block drainage and cooling pipes. They’re in North America too, and in 15 years they are estimated to have cost hydroelectric and water treatment plants somewhere in the region of $267 million to remove or defend against. It’s cheaper to defend against them than to remove them and fix the problems they cause, so you need to know what you’re dealing with.

Retrieval of zebra mussel-encrusted Vector Averaging Current Meter near Michigan City, IN. Lake Michigan, June 1999. Photo by M. McCormick, NOAA, Great Lakes Environmental Research Laboratory

Retrieval of zebra mussel-encrusted Vector Averaging Current Meter near Michigan City, IN. Lake Michigan, June 1999. Photo by M. McCormick, NOAA, Great Lakes Environmental Research Laboratory

Signal crayfish are another freshwater invasive species, this time from America, that have caused havoc in Europe because they are linked to the dreaded Crayfish plague (I kid you not). The American crayfish are resistant to this fungal(ish) disease, but they act as hosts and carriers. Ireland is the last country in Europe to be free of the invasive crayfish, but are constantly alert to the dangers they can pose to the native species.

Signal crayfish by David Perez, 2009

Signal crayfish by David Perez, 2009

I should say that the many introduced species aren’t actually all that problematic. I’ve not heard that Little Owls (introduced by the Victorians for the cuteness) or Ring-necked Parakeets (escapees from aviaries) have had any significant impact in the UK. Still, it’s interesting to know when species turn up somewhere, especially if it reflects a change in the environment that may have other impacts.

Little Owl by Arturo Nikolai, 2008

Little Owl by Arturo Nikolai, 2008

Noble False Widow spiders were a harmless addition to the UK fauna back in 1879, that were quietly tucked down in Devon until the changing climate gave them the conditions to move further north. Now they’re up as far as Liverpool thanks to our warmer winters. Similar patterns are seen for a variety of Mediterranean species, demonstrating how we can track changes in our environment by keeping track of where and when certain species are found – but if you don’t get the species right, you don’t have good data. That’s part of why we have museums in the first place, to lodge ‘voucher’ specimens of recorded species so identifications can be double checked in the future.

Steatoda nobilis, Forest Hill, London, by Paolo Viscardi, 2014

Noble False Widow

Of course, I’m sure that you all appreciate the importance of getting identifications correct, since here you are reading my blog which tends to be all about identification! For those of you who recognised the mystery object as a scallop of some sort I tip my hat, but to Daniel Jones I offer congratulations – this is indeed a Calico Scallop Argopecten gibbus (Linnaeus, 1767) which is, as Joe Vans suggested, a juvenile. Normally these are found on the Atlantic coast of America. Well done! I’ll let you know more about the specimen when the paper is published.

More interesting dead stuff to come next Friday…

Friday mystery object #244

This week I thought I’d give you a beautiful bird skin from the Horniman collections to have a go at identifying:

mystery244

Any idea what this colourful critter might be?

You can leave your suggestions in the comments box below – but please try to be cryptic if you find it easy, so other people get a chance to work it out themselves. Enjoy!

Friday mystery object #191 answer

On Friday we had this skull submitted by Dr Ben Swift for identification:

mystery191amystery191c

Now this is quite obviously a primate, as it has a bony ring around the orbit, a bony back wall to the orbit and just eight incisors as opposed to the twelve that forms the basal condition for mammals. The teeth also tell us that this is an Old World Monkey (Cercopithecidae), since these primates only have eight premolars instead of the twelve you find in the New World Monkeys (Platyrrhini). The small canines suggest that this is the skull of a female.

From there it starts getting a bit more difficult. The fairly small size of the specimen ruled out a few genera, but the main features that helped narrow down the possibilities were the very flat face, the heavy bony rings around the orbits, the flaring of the zygomatic arches (cheekbones) and the short and rounded braincase. Effectively the only way to consider these features is to look at a lot of comparative specimens (the excellent Mammalian Crania Photographic Archive proved very useful for this).

After a lot of consideration I found myself in agreement with the suggestion of something from the genus  Continue reading

Friday mystery object #184 answer (well, not really)

On Friday I asked for your help with identifying this object:

mystery184

There were a few interesting suggestions from beaks to bladders, but so far nothing really corresponds with the structure of this specimen. It’s very weird.

It looks like it’s probably from something aquatic, perhaps the ossified swim bladder of a fish, but I’m by no means sure of that.

I will see if I can read the notes written on the specimen under a UV light, but for now I have to admit that I am still stumped. Please let me know if you recognise what it is!

Friday mystery object #183

This week I have another genuine mystery object for you to have a go at identifying. I found a pair of legs in the collection and although I can think of a few things that they don’t come from, I’m a bit stumped as to what they did come from. Here’s one to give you an idea of what they look like:

mystery183a

 

mystery183b

Any suggestions would be appreciated!

Friday mystery object #163 answer

On Friday I gave you this object from the collections of the Horniman Museum to identify:

The specimen had lost its label at some point in the past, so I had to identify it myself and was hoping to get your opinion on what it might be.

When I first saw it I noticed an odd scar running diagonally across the top of the cranium, which made me wonder if it was some kind of marine bird with an odd salt glad. Then I realised that the scar indicated something else entirely, which gave me the clue I needed to make the identification.

It seems that most of you also noticed the scar and came to similar conclusions, so  23thorns, cackhandedkate, Ric Morris, Jake and Steven D. Garber all recognised it as a woodpecker of some sort and given the length of the skull rachel and henstridgesj arrived at the same conclusion about species as I did, which is the  Continue reading