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Nautili are free swimming animals that possess a head with two simple lens-free eyes and arms (or tentacles). They have a smooth shell over a large body chamber, which is divided into subchambers filled with an inert gas (similar to the composition of atmospheric air, but with more nitrogen and less oxygen ) making the animal neutrally buoyant ...
There are 19 pairs of digital tentacles that, together with the ocular tentacles, make up the 42 appendages that are visible when observing the animal (not counting the modified tentacles that form the hood). The labial tentacles are generally not visible, being smaller than the digital tentacles, and more variable both in number and in shape.
Nautilus have been observed to spend days in deeper areas around coral reefs, to avoid predation from turtles and carnivorous fish, and ascend to shallow areas of the reef during nights. [18] [11] Here, they engage in scavenging activity, seeking out animal remains, and the moults of crustaceans. Nautilus species usually travel and feed alone.
Scallops have up to 100 simple eyes. The molluscs have the widest variety of eye morphologies of any phylum, [1] and a large degree of variation in their function. Cephalopods such as octopus, squid, and cuttlefish have eyes as complex as those of vertebrates, while scallops have up to 100 simple eyes.
Because of their oceanic habitat, studies of their life cycle have primarily been based on captive animals and their eggs have never been seen in the wild. [7] Although nautilus have been kept at public aquariums since the 1950s, the chambered nautilus was first bred in captivity at the Waikiki Aquarium in 1995 (a couple of other nautilus species had been bred earlier) and captive breeding ...
Algae, which use photosynthesis, were observed living on the lightbulb anemone’s column and tentacles. Photos show B. lux with another species on its tentacles. Reproduced with permission from ...
Researchers said the unique animal is only the fifth species of its kind. ... Overall, the gnome sea pen has 328 tentacles. Several close-up photos show a diagram of this anatomy. The polyps are ...
Nautilus FP category for this image Wikipedia:Featured pictures/Sciences/Biology Creator KDS444. Support as nominator – KDS 4444 Talk 14:55, 2 March 2015 (UTC) Support - I've been waiting for you to come back. And you don't disappoint! — Crisco 1492 01:04, 3 March 2015 (UTC) Support - Hafspajen 09:37, 3 March 2015 (UTC)