Posts tagged jellyfish
Posts tagged jellyfish
Box Jellyfish, also known as Sea Wasps, are members of the class Cubozoa who are distinct from all other jellyfish.
They’re much faster and more manoeuvrable than other jellyfish, so much so that some of them can actively chase their prey.
Their tentacles are situated on each corner of the four corners of their lower surface. Some species have one, solitary tentacle per corner, others have bundles of over a dozen tentacles per corner.
The weirdest thing about them has to be their eyes. They have 24 of them! 8 of their eyes even have retinas and lenses! These are the best eyes in cnidaria, and they STILL don’t have brain.
All this eyesight may well take it’s toll, one species was seen spending 15 hours per day asleep.
I’m really hazarding a guess here, but maaaaaybe it’s Desmonema, possibly D. glaciale (Antarctica)
Don’t take my guess seriously tho
Hundreds of moon jellyfish babies have been born at the Weymouth Sealife centre in Dorset. Aquarists say they have never seen so many jelly babies of all shapes, sizes and colours from many different species at one time - but even though they may look cute many of them are highly poisonous as well.
A compass jellyfish (Chrysaora hysoscella) peeks from beneath a floating clump of sargassum weeds. Gower Peninsula, Wales.
Photo by D. Roberts. Source
The master! Discomedusae from Ernst Haeckel’s Art Forms in Nature.
Periphylla periphylla, the helmet jellyfish.
Despite this jellyfish’s ability to produce phosphorescence, other forms of light are toxic to it. For this reason, helmet jellies usually only move up in the water column at night in search of their planktonic food. Unlike most other cnidarians, P. periphylla does not have an anchored larval stage; rather, it remains pelagic throughout its entire lifecycle.
I was skeptical when I first read the ‘other forms of light are toxic’ line, but whoa, their own pigments that give them their coloration can really turn lethal when exposed to light of certain intensity (phototoxicity? photodegradation? so it was a bit like inverse melanin?)
Fascinating stuff. Read more here
Chrysaora hysoscella, the Compass Jellyfish, by Gaynor Rosier. North Atlantic to Mediterranean.
Do you know that Palau’s Jellyfish Lake (Ongeim’l Tketau) isn’t the sole place in the world where you can find and swim with swarms of stingless jellyfish pulsing around in a lake?
Then welcome to Kakaban, of East Kalimantan, Indonesia, a saltwater lake that’s probably an uplifted atoll. The jellies are from the genus Mastigias, some others are from genus Aurelia and Cassiopeia, which is the upside-down jellyfish. Cassiopeia (species ornata) can be found littering the bottom of the lake:
Why those two lakes have stingless jellies? I say it’s convergent evolution at work (which curiously employs the same genus, and hence very similar product taxa).
Check out our latest wallpaper for your desktop, mobile phone, or Facebook page: the Indonesian sea nettle!
The bane of local bathers and fishermen. No idea on the taxonomic identity, could be Sanderia malayensis or maybe just plain ol’ Chrysaora.
In the light of recent, mysterious video of
eldritch abomination from the abyssgelatinous veil like object in the deep sea, here’s a fine digital illustration of strange jellyfish Deepstaria enigmatica (top) and siphonophore Bathyphysa grimaldii (bottom). Artist unknown.
I will wear it as a hat.
Uric the Oddball already beat you to it.