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#cnidaria
animalshowdown · 1 day
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Phylum Round 3
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Annelida: Segmented Worms. This group includes earthworms, leeches, and many classes under the umbrella of “polychaete”. This diverse phylum encompasses deposit feeders (eating dirt), detritivores, scavengers, deadly ambush predators, filter feeders, parasites, herbivores, and more. They are broadly defined by their repeating body segments and parapodia, which are nubby appendages used for both movement and breathing. Some have curved jaws for catching prey or scraping detritus off of rocks, while others have wide, elaborate, brightly colored feather-like fans for filter feeding. While able to crawl freely, a majority of marine Annelids spend most of their time in self-built tubes or burrows. Among their many important functions, they play a key role in mixing soil/sediment, breaking down decaying organic matter, and providing a key food source to countless other animals.
Cnidaria: Jellyfish, anemones, corals, box jellies, and hydroids. They have a gelatinous body with radial symmetry, a decentralized nervous system, and tentacles surrounding a simple mouth. The defining feature of this phylum are their cnidocytes, or stinging cells. There are two different body plans of the Cnidaria; an immobile “polyp” attached to a surface, or a free-living “medusa” which can swim or drift in the water column. Many polyp Cnidarians, such as corals, live in colonies. Some corals build reefs which serve as habitat for other animals. Free-living medusa Cnidarians must return to the seafloor in a polyp-like stage as a part of their life cycle.
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typhlonectes · 5 months
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herpsandbirds · 1 month
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Striped Anemone (Dofleinia armata), family Arctiniidae, order Arctiniaria, Rocebuck Bay, Western Australia
photograph by thero-pod
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dinoserious · 5 months
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invertober day 19, white spotted jellyfish
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stijlw · 2 years
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Edwardsiella andrillae, an Antarctic species of sea anemone that lives upside-down, burrowing into the sea ice and projecting its tentacles into the frigid water below.
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todropscience · 6 months
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BRAINLESS BOX JELLIES CAN LEARN BY EXPERIENCE
Mangrove box jellyfish (Tripedalia cystophora) is a small species of box jellyfish, native to the Caribbean Sea and the Central Indo-Pacific, presenting a simple nervous system. But despite tiny, researchers have demonstrated present the ability to learn by association. Although has no central brain, and being the size of the finger-tip, this box jelly can be trained to associate the sensation of bumping into something with a visual cue, and to use the information to avoid future collisions.
In the wild, the Mangrove box jellyfish forage for tiny crustaceans between the roots of mangroves. To mimic this environment, researchers placed the box jellies in cylindrical tanks that had either black and white or grey and white vertical stripes on the walls. To the jellyfish, the dark stripes looked like mangrove roots in either clear or murky water. In the ‘murky water’ tanks, the jellyfish bumped into the wall because their visual system couldn’t detect the grey stripes very clearly. But after a few minutes, they learnt to adjust their behaviour, pulsing rapidly to swim away from the wall when they got too close, this state learning is based on the combination of visual and mechanical stimuli in simple animals with no brain.
The learning process, in difference with vertebrate animals, doesnt occurs in a central neuronal organs, but instead in a small organs named rhopalial nervous system, which act as learning center, in which the jelly combines visual and mechanical stimuli during operant conditioning.
Main image: An adult specimen of the box jellyfish T. cystophora., showing where is located one of the four sensory structures named rhopalia, which includes two lens eyes. Each rhopalium also contains a visual information processing center.
Reference (Open Access): Bielecki et al., 2023. Associative learning in the box jellyfish Tripedalia cystophora. Current Biology.
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a post for all of my fellow jelly enthusiasts
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pers-art · 11 months
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hey, thanks @chaumas-deactivated20230115 (it's on webtoon!)
inspired by this post
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beautyunderthewaves · 9 months
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Favia Coral aka Brain Coral 💙
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colorsoutofearth · 6 months
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Mauve stinger (Pelagia noctiluca)
Photo by Magnus Lundgren
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snototter · 4 months
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A lion's mane jellyfish (Cyanea capillata) feeding on moon jellyfish in the white sea
by Alexander Semenov
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typhlonectes · 2 months
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meme creator: Olivia Hathaway (FB)
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herpsandbirds · 5 months
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Barrel Jelly (Rhizostoma pulmo), family Rhizostomatidae, found around much of the Atlantic Ocean
photograph by @venueearth
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every-animal · 5 months
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Common name: Giant Siphonophore
Scientific name: Praya Dubia
Can be found in: Coasts around the world, ranging from Iceland in the North Atlantic to Chile in the South Pacific. It lives in a depth range of 700 m (2,300 ft) to 1,000 m (3,300 ft)
Info: the Giant Siphonophore is not a single organism, but a colony of components called zooids, each with a different function. It can grow to a body length of up to 50 m (160 ft). The zooids arrange themselves in a long stalk, called a physonect colony. The larger end has a dome-like float called a pneumatophore, which keeps the colony’s buoyancy, letting it stay at a preferred depth. The tentacles are used for catching, immobilizing, and distributing the nutrients to the rest of the colony. A Great Siphonophore retains its shape due to water pressure, so when it’s brought to the surface (typically by getting caught in nets) it looks like a blob of jelly.
Source(s): X
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angelnumber27 · 7 months
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by Elfi Kluck
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wikipediapictures · 1 year
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Thysanostoma
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