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Nautilus

nautilus

Origin: L, fr. Gr. A seaman, sailor, a kind of shellfish which was supposed to be furnished with a membrane which served as a sail; fr. Ship. See Nave of a church.

1. (Science: zoology) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See tetrabranchiata.

The head of the animal bears numerous simple tapered arms, or tentacles, arranged in groups, but not furnished with suckers. The siphon, unlike, that of ordinary cephalopods, is not a closed tube, and is not used as a locomotive organ, but merely serves to conduct water to and from the gill cavity, which contains two pairs of gills. The animal occupies only the outer chamber of the shell; the others are filled with gas. It creeps over the bottom of the sea, not coming to the surface to swim or sail, as was formerly imagined.

2. The argonaut; also called paper nautilus. See argonauta, and Paper nautilus, under Paper.

3. A variety of diving bell, the lateral as well as vertical motions of which are controlled, by the occupants.


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segmentation in marine invertebrate

Some primitive mollusks show hints of segmentation (not nautilus, though). And sea spiders. I've forgotten whether there are any "minor" phyla that fit...

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by Darby
Tue Jun 14, 2011 1:37 am
 
Forum: Zoology Discussion
Topic: segmentation in marine invertebrate
Replies: 1
Views: 1832

segmentation in marine invertebrate

... would anyone know of other marine inverts, other than crustaceans and annelid worms, which would show segmentation. Would the chambering of the nautilus shell count by any chance? Thanks

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by Doug207
Mon Jun 13, 2011 10:12 am
 
Forum: Zoology Discussion
Topic: segmentation in marine invertebrate
Replies: 1
Views: 1832

Pitfalls of Evolutionary Psychology: Exaptation

... metaphor, consider that the Golden Ratio (Phi) 1.618 is abundant throughout the universe and can be seen both in the math of the spiral formed by Nautilus mollusks and the spiral in galaxies seen by the Hubble space telescope. Rather than viewing our existence as some unique product of evolution, ...

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by jeremyo
Mon Aug 17, 2009 12:12 am
 
Forum: Evolution
Topic: Pitfalls of Evolutionary Psychology: Exaptation
Replies: 5
Views: 34853

Why do you keep talking about species

... Dollars Class: Holothuroidea Sea Cucumbers Phylum: Mollusca Molluscs Class: Bivalvia Bivalves Class: Cephalopoda Squids, Cuttlefishes, Octopus, Nautilus Class: Gastropoda Snails, Slugs Class: Polyplacophora Chitons Kingdon: Plantae Phylum: Magnoliophyta Flowering Plants Order: Casuarinales Casuarinas ...

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by gamila
Mon Jun 29, 2009 5:35 pm
 
Forum: Evolution
Topic: Why do you keep talking about species
Replies: 23
Views: 50256

Marine intertabrates

Congrats, Coff! :D Wish you all the best for your career! :D I like squid but for meal :oops: Seriously, Nautilus and Octopus seem very interesting. Nautilus is said as one of ancient marine creatures, whereas Octopus is said as the smartest marine animals :)

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by Dr.Stein
Tue Apr 10, 2007 3:39 pm
 
Forum: Zoology Discussion
Topic: Marine intertabrates
Replies: 4
Views: 4010
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