Friday mystery object #338 answer

Last week I gave you this mystery object to have a go at identifying:


I thought it would prove tricky and I wasn’t wrong. For starters, it’s not a great photo – you can’t see many of the more distinctive features that might provide a clue, like the face with the nose shape. This wasn’t because I was trying to hide anything, it was simply because things have been very busy recently and I took this photo in a hurry as a record of a new specimen, rather than as an image for the Friday mystery object.

However, there are some clues available. First of all, the wing claw is on a short digit, unlike the long finger that you see in the fruitbats – plus it doesn’t have the big eyes that the fruitbats have so this is one of the microbats. Next, the scale shows that this animal would have a body length around 10cm – which is pretty big for one of the microbats.

Then you don’t have a big visible nose structure, which considering the angle of the photo doesn’t mean there isn’t one, but if it has one it’s not very prominent. In fact, there may be something a bit misleading in that area – a shiny black bump in the nose area that almost looks like a fake nose has been stuck on. This in fact is a bit if a clue as to the identify of this bat.

It’s actually a waxy secretion from just behind the nose that the males of this species produce as a signal to females and, I can attest, it’s quite pungent smelling. This combined with the colour of the fur suggests that this is a Diadem Round-leaf Bat Hipposideros diadema (É. Geoffroy, 1813).

20180913_170608-01.jpegThis is a very widespread species with a range from South East Asia to the top of Australia. Because they’re quite large and heavy they’re not very manoeuvrable, so they ambush their prey of large moths and beetles from a perch, launching themselves at anything their sonar picks up as it flies by. In fact these bats are big enough to take small birds and those large canines combined with having a very high bite force mean the Diadem Round-leaf Bat is able to handle these bigger prey and for researchers it’s reported to have a very painful bite.

This particular specimen was presented to the Museum by Customs, who seized it in the post because it lacked the appropriate import paperwork. I’m now in a bit of a quandary about what to do with the waxy secretion on the head. It has gummed down the leaf on the nose and it smells pretty strongly, so it make the specimen less useful for display, but it is still an interesting feature of the biology. It may a case of removing a sample and keeping it in a small tube with the specimen and then cleaning the rest off, so the full beauty of this bat’s face can be revealed.


Friday mystery object #337 answer

Last week I gave you this largely amorphous blob to have a go at identifying:


Perhaps unsurprisingly it proved quite tricky, with most people opting for a brain, heart or gland of some kind. However, believe it or not, this is actually a whole animal.

In the comments a close suggestion came from palfreyman1414 who said:

“…invasive crab lip parasitical crustacean isolated…”

Tony Irwin clearly knew the actual answer with a nicely crafted cryptic link to the two common sequential hosts of this animal, the Flounder and the Cod. Meanwhile, on Twitter there were another couple of suggestions – one was a good general biological principle:

The other was a straight-up correct answer from Dr Ross Piper, an old zoological buddy from postgrad days and an aficionado of odd animals:

This is indeed a Codworm or Lernaeocera branchialis (Linnaeus, 1767) a type of copepod parasite that has a life history in which they spend part of their mobile larval stage parasitising flounders (and similar fish that sit around a lot) until they’re able to mate, at which point the fertilised female seeks out one of the mobile gadoid fish (the Cod family), where she gets into the gills and plumbs herself in to the Cod’s blood supply right at the heart, with her egg sacs at the gills and protected by the operculum (gill covers). She then spends the rest of her life sustained by fish blood, releasing eggs into the water and looking like a black pudding being eaten by maggots. Now those are life goals.

Digital StillCamera

Adult female Codworm in Whiting gills. Image by Hans Hillewaert, 2006

Friday mystery object #336 answer

Last week I gave you this impressive beetle to try your hand at identifying:



Now although it’s big and showy, beetles can be hard to identify because there are just so many of them and closely related species can be very hard to tell apart.

This one has distinctive elongated jaws that mark it as being one of the stag beetles (family Lucanidae), which narrows it down, although there are well over a thousand species in the family. This one is a little bigger than most and the jaws are relatively unbranched, with a cleft at the end of a relatively squared-off and downward deflected ‘antler’.

Those ‘antlers’ are used by the males to wrestle for access to females, who have much more sensibly sized jaws and are smaller. Effectively they’re doing the same thing as deer and this is a good example of how evolution can lead to similar trends in behaviour and even sexual dimorphism across very different animal groups.

I think this is Mesotopus tarandus Swederus, 1787 which is a species from West Africa that is becoming increasingly popular in the pet trade. It has slightly shorter ‘antlers’ than the other species (or possibly subspecies) in the same genus, M. regius.

As you probably know, I’m more familiar with vertebrate identification than insects, so I was fortunate to have my intern Esmeralda, who is a keen coleopterist helping narrow this down, although I’m pleased to congratulate jennifermacaire who was on the same track with her identification.

Another mystery next week!

Friday mystery object #335 answer

Last week I gave you this insect from Suffolk/Norfolk to have a go at identifying:


I thought that some of you would have a pretty good idea about what it might be, and I wasn’t mistaken.

Chris got in quickly with this cryptic clue:

I don’t want to be a snob but this entomological servant is much more common than the butler.

This was absolutely spot-on, so for those of you who don’t know what it relates to I’ll explain. The reference to a servant was an allusion to a Footman, which is the common name for this type of moth.  Chris also narrowed it down to the species by explaining that it was common – so the Common Footman Eilema lurideola (Zincken, 1817).

There are a variety of similar looking Footman moths, but the Common Footman can be distinguished by its slightly greenish grey first pair of wings that have a yellow edge, but a yellow second pair of wings, that you can just make out in the photograph showing the underside.

Well done to everyone who worked it out – more mysteries next week!