This is the third and final in this series of iridescence in animals; the first two dealt with birds, but this time I want to look at other animals - mostly invertebrates but with a fish and a lizard thrown in. The principles are exactly the same as in feathers, with layers of cells underlain with melanin reflecting light from bottom and top surfaces such that they reinforce or cancel each other, giving gleaming colours like polished metal or glass.
Beetle carapaces seem particularly suitable for the task - or maybe it's just that there are so many beetles!
This scarab beetle, from along the Tamar River in Tasmania, has to be one of the most beautiful animals I have ever seen; the glowing colours were spectacular. |
Christmas Beetle (because they emerge in huge numbers to eat eucalyptus leaves in high summer), Anoplognathus sp., Canberra. These are also scarabs. |
Scarab on Acacia flowers, Leeuwin Naturaliste NP, south-west Western Australia. |
Diphucephala sp. on Acacia dealbata, Tinderry NP, south-east of Canberra. |
Wasp, Standley Chasm, central Australia. |
Fly, Batang Ai NP, Sarawak. It's OK, I'd given up on the tea by now anyway! |
Unidentified bug - ie Hempiteran - Sceales Bay, western South Australia. (My thanks to Susan - below - for correcting my previous blunder with this one!) |
Pollanisus viridipulverulenta Yeldulknie CP, western South Australia. Only a small moth, but it absolutely gleams. |
Butterflies and moths are not the only ones with iridescent wings however.
Scarlet Percher Diplacodes haematodes Standley Chasm, central Australia. |
Carpenter Bee, Playa Espumilla, Santiago, Galápagos. Not much iridescence here, but a few seconds later that changed with a change of position - see below! |
Finally, a couple of vertebrates, as promised. Some frogs have the characteristic, but I don't have photos of those. Many fish feature brilliantly flashing silver as they turn, perhaps to help confuse predators.
Finally, one of the most handsome lizards I know.
This big lizard, in all his breeding finery, is a male Eastern Water Dragon Intellagama (formerly Physignathus) lesueuriiAustralian National Botanic Gardens, Canberra. |
I hope this little series has given you some pleasure too. Perhaps something slightly less flashy next time...
BACK ON WEDNESDAY
2 comments:
Ahem...your first unidentified beetle is a bug (check the antennae). I'd guess Scutelleridae, a jewel bug nymph, so entirely appropriate for the purposes of this post.
The second is another Scarabaeidae chafer of some sort, munching on pollen.
Oops, thanks Susan, duly noted...
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