This week’s mystery object was found in the Dead Zoo, but not in the collections. I came across this specimen on the stairs on my way into work this morning:
Any idea which species this might be?
Probably a bit on the easy side for the entomologically inclined amongst you, so maybe keep your answers cryptic if you can.
Have fun!
Last week I gave you this really difficult, but incredibly cool mystery object to identify:
Definitely not a simple one for the uninitiated, but most of you got impressively close.
It looks a bit like ancient chewed gum at first glance (hey, it’s a thing!):
However, on closer inspection, some of the features start to emerge – including teeth:
Obviously, this is the fossilised skull or some critter, but what kind of critter is harder to determine.
The length suggests it’s something about the size of a rabbit:
And if you’re looking for a good fossil rabbit, you can’t beat Palaeolagus:
As you can see, the mystery object has a few differences, but due to the various missing parts, it’s a little hard to be confident exactly how different they are – although the shape of the orbital margin (the front of the eyesocket) gives a bit of a hint.
But, even more useful, is the curve in the maxilla (the upper jaw bone) that traces the root of the first incisor. In lagomorphs (rabbits, hares and even pikas), the incisor roots terminate with quite a big gap before the orbital margin, often with a triangular fenestrated region of cancellous bone (a sort of window of bony struts) in between.
The mystery specimen doesn’t have that – in fact the end of the incisor root is very close to the orbital margin. This is something you see in rodents.
I would have been impressed if you got that far, since the overall shape and size of this specimen definitely gives off a rabbity vibe, but believe it or not, this a dormouse. More specifically, it’s the Gigantic Dormouse Leithia miletensis (Adams, 1863) or if you want to go with the commonly used and more technically accurate, but nomenculatorily incorrect, L. melitensis, since Adams made a spelling error in his original description.
In fact, this is one of the specimens collected and figured by Adams in that original work describing the species, making this part of the type series for the species (although the holotype is more likely to be a very well preserved half mandible from the same site).
The fact that this is a fairly large and intact part of the type series means that it is of great interest to researchers. The reason I had this specimen to hand for the mystery object, is because I was preparing it for a research loan to some of my old colleagues in UCL, where it’s being MicroCT scanned.
This research will help refine an understanding of the morphology of the Gigantic Dormouse and offer some clues to what happens on islands that leads to the development of giants, building on work that they’ve been doing on this fascinating species, which is an interesting read that you can find here (you may even recognise Fig. 1B).
Virtual Cranial Reconstruction of the Endemic Gigantic Dormouse Leithia melitensis (Rodentia, Gliridae) from Poggio Schinaldo, Sicily, By Jesse J. Hennekam , Victoria L. Herridge, Loïc Costeur, Carolina Di Patti, Philip G. Cox – CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=92037373
This week I have a really cool mystery object for you to have a go at identifying:
I’d be very interested to hear what you think it might be – but I suspect it will be a bit of a challenge. Enjoy!
Last week I gave you a somewhat tricky object to identify:
It’s only about 14mm long, it’s hollow and it has a seam down either side:
These features seemed to raise more questions than answers for many of you – and I’m not surprised, since this really does require some experience with the object to identify it.
Fortunately, some of you clearly had the necessary experience. Chris Jarvis and Adam Yates and Kat Edmonson all chimed in with some very useful suggestions, observations and discussion.
It’s a tooth from a Mugger Crocodile Crocodylus palustris (Lesson, 1831), in fact, if you want to be specific, it’s a newly emerging tooth from the 3rd socket from the rear in the left maxillary row.
I really wasn’t expecting anyone to figure out the exact species, but I was impressed that several of you figured out it was from the genus Crocodylus rather than Alligator.
There isn’t much published on dental morphological characteristics of extant crocodilians – a point noted in the one paper I was able find that tried to figure out what’s going on with crocodile tooth shape – although this one would more or less match up to M12 in this figure from that paper.
So well done to everyone who figured out the crocodilian source of this mystery object!
This week I have a mystery object that might be easy for some, but I suspect it may be a challenge for most:
Any idea what this might be and, more importantly, which species it came from?
As always, you can leave your thoughts, questions and suggestions in the comments box below. Have fun!
Last week I gave you a mystery object that came wrapped in this intriguing box:
The discovery inside was this:
Definitely not a Poptart.
This is a discovery made by 10 year old Anna, who found it when digging in the garden with her Dad, and she’s keen to know what it’s from. In fact, she’s hoping it’s from a new species of dinosaur, so it can be give the excellent name Annasaurus (although I believe such a creature already exists in the world of Doctor Who).
While the bone is pretty big, unfortunately it’s not from a dinosaur, but a large mammal. The cut surface looks very neat and that suggests that it’s been passed through a band-saw, probably by a butcher:
This would suggest it comes from one of the commonly eaten species, such as Sheep, Pig or Cow – although It is possible that butchered bone would come from another animal, such as Goat, Horse or a species of deer.
However, the size immediately reduces the likely suspects down a lot. It’s bigger than any Sheep or Goat bone I’ve encountered, so the focus is on Horse and Cow, although Red Deer and Pig are worth a look too,
Normally my first question is “which bone is it?” and in this instance it’s actually a bit harder than usual because it’s both cut and from a young animal, so the articular surface from the top of the bone (or epiphysis) hadn’t fused yet and is missing.
This means we’re looking at the neck section of the bone (the metaphysis), which is harder to find good material to compare against. However, with common species there are at least some excellent online resources to see full bones from a variety of angles that can help build up a picture of what to look for.
In this case I used OsteoID, which has good coverage of skeletal elements for a lot of mammal species that commonly occur in North America. I already recognised that this was from around the knee area, so I first checked if we are dealing with the leg section above the knee (distal femur) or the bit below (proximal tibia). Wouter van Gestel suggested shin bone (tibia) in the comments and I came around to that interpretation, so that’s what I originally went with.
However, Christian Meyer later suggested it was more likely to be distal part of the femur, and after looking at the specimen in hand, I find myself in agreement.
On to the species! It’s a good bit broader than the Pig femur (especially considering that the epiphysis is the broadest section of the bone and that’s missing here).
The shape of the metaphysis is too robust for deer, who have a more sharply defined ridge that runs into the main shaft of the bone (or diaphysis):
But it’s not as robust and it tapers more in the metaphyseal area than you’d expect from a Horse..
So after a good bit of comparison, I’m fairly certain that this is the distal metaphysis from the femur of a Cow Bos taurus Linnaeus, 1758.
I will write back to Anna to let her know about her discovery and while it may not be a dinosaur, it’s still an interesting find, so I hope she’s not too disappointed!
This week I have a great mystery object for you – it came in one of the best bits of post I’ve had for ages:
Here is the discovery that was inside:
Any idea what it might be?
As ever, you can leave your answers in the comments box below – but I suspect that some of you might know exactly what this is, so please try to keep your answers cryptic, so everyone has a chance to work it out for themselves. Have fun with it!
Last week I gave you a guest mystery object from Catherine McCarney, the manager of the Dissection Room at the UCD School of Veterinary Medicine:
The first question I normally try to answer when undertaking an identification is “what kind of bone is this?”, but in this instance it’s not immediately obvious.
There is a broad section with articulation points, a foramen (or at least something that looks like a hole, which might be a foramen) and a flattish section that looks like it probably butts up against something with a similar flat section. This would normally put me in mind of the ischium of a pelvis.
But it’s not a pelvis as the articulations are all wrong and the shape of the skinny piece of bone that projects off doesn’t fit any functional ilium shape that I’m aware of.
The pectoral girdle has a similar set of structural features and this object starts to make more sense with that in mind. Things like turtles and whales may have a structure like this, but there’s something to keep in mind: despite being fairly large, this object only weighed in at 26g.
Turtles and whales have dense bone that helps reduce buoyancy, to make remaining submerged less energetically demanding, but this bone must be full of air spaces – which offers a clue as to likely type of animal it came from. A bird – as Joe Vans noted in the comments.
Considering the size of this object there are very few possible candidates. Most birds are pretty small and this object is pretty big, so we just need to look at some of the Ratites.
The comparisons I managed to find have led me to the conclusion that this is most likely part of the pectoral girdle of an Ostrich Struthio camelus Linnaeus, 1758.
More specifically, I think it’s the coracoid (#2 on image), clavicle (#3 on image), and scapula (#4 on image) from the left hand side of the pectoral girdle of an Ostrich.
I was delighted to see that Wouter van Gestel agreed with this assessment in the comments, since he knows more about bird bones than I could ever hope to learn!
Finally I’d like to thank the fatastic Catherine McCarney for sharing this mystery object from the depths of the Vet School’s collections. I hope you all enjoyed this challenge!
I have a great guest mystery object for you this week. It comes from the wonderful Catherine McCarney, who is manager of the Dissection Room at the UCD School of Veterinary Medicine:
Here’s what Catherine has to say about it:
This object is a bone fragment from an unknown animal. It was discovered while cataloging an old box of historic specimens in the UCD School of Veterinary Medicine. It’s of limited use in the vet program, but my Zoologist background is keen on answering the mystery rather than simply discarding it. It has me stumped, it’s light weight (just 26g) had me thinking it must be from a bird, but some features are reptile like.
So, do you have any thoughts on what this mystery object might be?
As ever, you can leave your thoughts, questions and suggestions in the comments box below. Happy sleuthing!
Last week I gave you a somewhat challenging bony mystery object to have a go at identifying:
The first challenge is recognising the type of bone. It’s not part of the axial skeleton (like the skull, vertebrae, ribs, etc) and it’s not one of the long bones, which are very distinctive.bits of the appendicular skeleton (which includes the pelvis, shoulders and limbs).
So that leaves the distal bits of the limbs, which tend to be relatively small. This is where it helps to be familiar with bone shapes – and this sort of elongated rectangle with an articulation at just one end is fairly distinctively a heel bone or calcaneus. (N.B. the end without the articulation provides a connection point for the Achilles’ tendon.)
At 8cm it’s fairly large, so that suggests it’s from a fairly large animal. This actually confused me more than it probably should have – but more about that in a minute.
The calcaneus is a very functionally important piece of bone, so the shape will reflect the use. However, the use of a leg tends to be broadly similar between closely related animals. Therefore, while it’s fairly straightforward to rule out things like carnivores and primates by using online reference resources like the incredible helpful BoneID site, it all gets more complicated when you realise this is from a member of the Artiodactyla, which has 270 or so species.
Common species are a good place to start with comparisons, since you are more likely to find their bones. So I started by looking at Deer, Horse, Pig, Sheep and Goat. I probably got a bit sidetracked by the size of this particular specimen at first, but as I have maintained on many occasions, size can be misleading and shape is always a better factor upon which to base an identification, since animals of the same species can come in different sizes.
After ruling out Deer, Horse and Pig I found myself wavering between Sheep and Goat. To dig into the shape differences a bit more, I took a look at an interesting paper on geometric morphometric comparison between the calcanea of Sheep and Goats by Lloveras, et al. 2022. The shape is very similar between the two species, but the differences identified in that paper have me leaniing towards the idea that this mystery object is most likely the calcaneus of a Sheep Ovis aries Linnaeus, 1758.
The differences are quite hard to decribe in a non-technical way, in the paper it goes like this:
According to our results the shape differences across sheep and goat calcanea are mostly located on the calcaneal tuber and neck, the sustentacular tali region, the malleolus articular surface and the cubonavicular articular surface. In general terms, in sheep, the calcaneal tuber tends to be more concave on the anterior side and the calcaneum neck, the sustentacular tali region and the cubonavicular articular surface tend to be wider. In opposition, in goats, the malleolus articular surface region tends to be shorter and more prominent anteriorly. These morphological differences could reflect the functional adaptation of these animals in different habitats that demand different methods of locomotion. While the sheep is adapted to running across flat land, the goat is adapted to rocky escarpments.
Lloveras, et al. 2022
In general terms it’s probably sufficient to take a look at the specimens on BoneID (you’ll need to flip the mystery object in your head, as it’s upside down and a mirror image since it’s from the right leg rather than the left, which is what’s shown on the BoneID site). The angles and extent of the articulations seem to be better defined in Sheep and match more closely to the mystery object.
So congratulations to Adam, who was the first to figure it out (beating me to it, which led to some rapid back-pedalling by me in the comments!)
Finally, back to the size. All I can say is that the sheep that this calcaneus came from was, well, quite possibly memeworthy…
This week I have a bony mystery object for you to have a go at identifying:
Any idea what this solid piece of bone might be, and which animal it could be from?
As ever, you can leave your questions, thoughts and suggestions in the comments box below. I hope you enjoy the challenge!
Last week I gave you this guest mystery object from Andy Taylor:
Those paired incisors and the large diastema (or gap) behind them are characteristic of a rodent, so that narrows down the possible options by not very much, since there are well over 2250 species.
However, this specimen also has a very large infraorbital canal (that big forward-facing hole in front of the eye socket), which is a feature of the hystricomorphs – the group containing capybaras, porcupines, chinchillas, guinea pigs, hutias and suchlike. The teeth are an additional give-away for the group, with their discrete little patterns on the grinding surfaces:
The scale of this specimen threw me a little at first, as I’m used to dealing with metric, but this scalebar has 16 subdivisions, so it muct be imperial. Which really helps, as it means this skull is quite large for a rodent – somewhere in the region of 5 inches or 12.7cm. That immediately narrows things down a lot more.
An additional clue is in the narrow skull profile:
A lot of rodents have a lower and broader skull and this kind of shape is what I expect to see from a species that moves through dense undergrowth rather than climbing, digging or swimming. This, combined with all the other clues, led me to the agoutis.
There are 12 species of agouti, so we’re still not quite there with the identification. Most species that I can find comparative material for have a significantly longer rostrum than this specimen (relative to the rest of the skull), but there are some species I’ve not been able to find a really reliable reference skull to compare against.
There is one species where I couldn’t find a great skull comparison, but which appears in living individuals to have a relatively short snout and the skull image I could find also appears to be less nasally advantaged than most agoutis. That was the Brazilian or Red-rumped Agiouti Dasyprocta leporina (Linnaeus, 1758).
I’d be keen to take a further look with some good quality reference material, but I’m reasonably happy with this. The advantage of good comparative material is that it really helps make those detailed observations about particular shapes and sizes that can be hard to properly recognise from a photo.
In a strange, but very welcome cooincidence, I had the good fortune to meet up with Andy last Friday evening. I was at the NatSCA conference in the UK – which was held just a short journey from where Andy lives. It offered a great chance to chat with a fellow bone geek and natural history fanatic and I hope to have some more guest objects from Andy and his amazing collection in the future!
This week I am have a great guest mystery object from Andy Taylor for you to have a go at identifying:
Here’s what Andy says about the specimen:
On Sunday, myself and Sophie Bagshaw were working through specimens that were donated to me from a person who had been given them by a zoological park. The specimen in question was part of a huge shipment of almost 140 frozen specimens that were in various states of preparation and were mostly head specimens. … I have a large rodent skull that I’m struggling to ID
Andy and Sophie have been doing great stuff with osteology for educational purposes for a while now, so it was a real pleasure to get a question like this, and it seems like a perfect opportunity for the community here to add their thoughts.
So, what do you think it is? Let us know below!
Last week I gave you this skull from the collections of the Dead Zoo, which had been misidentified and that came to light when Dr George Argyros was doing some research on the carnivore skeletons:
The label attached to this specimen indicated that this is the skull of a Leopard, which is clearly wrong. The label also identified the specimen as having been collected in East Africa by Major A.W.V. Plunkett.
Labels like this worry me. Not because they contain a misidentification, but because they may indicate that someone in the past has mixed up the specimen labels. This is a much bigger problem than a simple misidentification, as it can mean the real specimen has become dissociated from its information.
The huge, robust teeth of this specimen should make it fairly clear that it belongs to one of those specialist bone-crushers – the hyenas:
However, there are three species of hyena to choose from (I’m leaving the Aardwolf of this, since they don’t match this dental morphology even remotely).
My first thought was that this specimen is on the small side for a Spotted Hyena:
Size is seldom a definitive feature, especially in species that display sexual dimorphism, but what is more useful is the detail of the tiny molar at the back of the maxillary toothrow. This is absent in Spotted Hyenas, but it occurs in both Striped and Brown Hyenas.
So you might ask, how do we distinguish between Striped and Brown Hyenas? This is a good question. For starters, it’s hard to find enough reliable good images of the Brown Hyena’s skull online that show the details needed to distinguish between the species.
However, a bit of searching highlighted that the Brown Hyena has a shorter and more robust angular process of the mandible than the Striped – and the mystery object.
This long angular process was spotted by katedmonson, but Adam Yates was the first with the identification of Striped Hyena Hyaena hyaena (Linnaeus, 1758).
This one proved a little trickier than I thought at first, due to the similarities between the Brown and the Striped species. But I’m a little relieved that the consensus fell on Striped, both here on the blog, and between myself and George, since the Striped Hyena is found in East Africa, whereas the Brown is limited to South Africa.
This at least agrees with the locality on the label, so it may well have simply been misidentified when the specimen was acquired – especially since it looks like it was skeletonised naturally, so it may have been found dead and already defleshed, making it harder to identify.
I hope you enjoyed the challenge!
Since everyone seemed to have fun with last week’s mystery skull, I have another that was misidentified in the Dead Zoo’s collections and which came to light during Dr George Argyros’ recent research visit:
Do you recognise this species from its skull?
As usual, you can ask questions or leave suggestion in the comments box below. If you do know what it is, then please try to keep your answers cryptic, so everyone can have a go at working it out. Have fun!
Last week I gave you this skull from the collections of the Dead Zoo to have a go at identifying:
This specimen came to light during some research being carried out on carnivore bones by Dr George Argyros, a Professor visiting us from Emory & Henry College, Virginia. It was identified as Vulpes on the label, but both George and myself were doubtful.
The specimen’s spurious identification can be tracked back to when it was named in the Museum’s register as Vulpes fulva argentata or Silver Fox. This identification was assigned to the specimen when it was given to the Royal Zoological Society by N.H.P. Vickers in March 1900 (see page 127 of the monthly Irish Naturalist covering March 1900):
The Museum bought the specimen in skeletal form from the Royal Zoological Society of Ireland in 1903 and the name Silver Fox was kept until a later review of the taxonomic hierarchy in our database, which ‘corrected’ the name to Red Fox Vulpes vulpes.
However, this name change was not based on the morphology of the specimen. The characteristic lyre-shaped sagittal crest1 immediately made both myself and George think Urocyon and the small size of the specimen made both of us converge on an identification of Island Fox Urocyon littoralis (Baird, 1857) after independent bouts of measuring.
For those of you interested in seeing the size range parameters for Island Fox skulls, this PDF of the Mammalian Species description of Urocyon littoralis is very helpful indeed.
So I offer a hearty congratulations to everyone who spotted that this skull is from the genus Urocyon, although I think most people were thinking of the Grey Fox, Urocyon cinereoargenteus.
1It probably shouldn’t really be referred to as that, since it isn’t actually sagittal, except perhaps where the two ridges meet at the very back of the skull – but you know what I mean.
This week I have a nice skull from the Dead Zoo for you to have a go at identifying:
This specimen came to light as being misidentified when a visiting researcher was taking a look through the collection. We both agreed on what we thought it was, but I’d love to hear your thoughts.
I suspect that this may be easy for some of you, so as ever, please try to keep your answers cryptic, to give everyone a chance to work out what it is. Have fun!
Last week I gave you this rugged skull, from a rugged place, to have a go at identifying:
As everyone spotted, this is a whale of some sort (what else has a skull that weird-looking?), but the question is, which species?
The location led to a few suggestions of Arctic / sub-Arctic species like Narwhal or Beluga, but they have a much flatter top section of the skull. In fact, those huge vertical lobes of the maxillae seen here is pretty unusual and quite distinctive (even if it is a ittle weathered and broken):
This reminded me of a specimen in the collections of the Dead Zoo and which I had to check, just to be sure of my identification:
As spotted immediately by Chris and not too long afterwards by Adam Yates and Wouter van Gestel, this is the skull of a Northern Bottlenose Whale Hyperoodon ampullatus (Forster, 1770).
This sub-Arctic species has a distribution across much of the North Atlantic. They tend to stick to quite deep water, which makes sense in the case of the specimen I shared from Iceland, since the Reynisfjara beach is infamously dangerous because it shelves off very steeply into very deep water, making the waves that break along the beach behave in an unusual (and frankly terrifying) way.
Occasionally this species will come into shallower waters, in one (somewhat tragic) case a female Bottlenose Whale swam up the Thames (and is now in NHM, London). Our specimen came from an animal stranded on the Irish coast and there are theories that maritime sound pollution is connected to them being driven into shallower waters.
Well done to everyone who worked out which species this skull is from – hope you’re ready for another mystery next week!
Last weekend, I was fortunate enough to be able to visit Iceland, to witness some of it’s remarkable landscapes.
One location we visited was the infamously dangerous Reynisfjara black sand beach, with it’s “sneaker waves”, which regularly drag people out into the freezing waters.
Something else met its fate on those sands and it’s skull now sits outside the visitor centre. Any idea what it might be?
Worth noting there’s a footprint next to the skull, that gives a hint about the scale.
As always, you can add your questions, observations and suggestions in the comments box below. Have fun!
Last week I gave you a challenge to get your teeth into:
As I suspected, everyone managed to figure out what type of animal this is, since these teeth are quite distinctive (as mammal teeth often are).
To start with, there are canines and incisors in the premaxilla (the top jaw). These are missing from things like cows, sheep and deer. So it’s not one of them. The premolars are adapted to grinding rather than cutting, so it’s not some kind of pig or carnivore.
The molar teeth are low-crowned, unlike the teeth of grazers like horses which are high crowned, to cope with the wear and tear of silica-toughened grasses. This suggests an animal that browses on softer vegetation. Also, the lophs (those ridges of enamel that join the tooth cusps) are well defined and quite distinctive in their shape. That rules out most other herbivores, including the camels and their relatives.
It turns out that this is a species that I’ve featured on the blog before (although it was almost 11 years ago!) Not a Baird’s Tapir as most people thought, but a Malayan Tapir Tapirus indicus Desmarest, 1819.
I think it’s understandable that nobody got the correct species, since the specimen is a subadult (check out the molar in the jaw that’s still developing) which will somewhat alter the proportions compared to an an adult – especially considering the photos I gave you were restricted to the teeth and missed all the useful features of the rest of the skull.
So well done to everyone who worked out that the teeth belonged to a tapir!
Zygoma 