49 votes
Accepted

How long can an octopus survive out of the water?

Short answer Under ideal conditions, an octopus may survive several minutes on land. Background Octopuses have gills and hence are dependent on water for the exchange of oxygen and carbon dioxide. ...
AliceD's user avatar
  • 52.4k
12 votes
Accepted

What is the name of this creature?

Nautilus. Nautilus belauensis. Licenced under CC ASA 3.0 unported, via Wikipedia 2022 from user Manuae. Mollusca -> Cephalopoda (like squid and octopus) -> Nautilaceae -> Nautilidae - ...
Jiminy Cricket.'s user avatar
12 votes
Accepted

What species of snail is this?

It resembles Cepaea nemoralis, or commonly called Grove Snail, belonging to the family Helicidae. Image Source: WikiMedia Commons According to Wikipedia, these snails were introduced to North ...
Imtiaz Raqib's user avatar
  • 1,278
10 votes

How long can an octopus survive out of the water?

Found an octopus today which had attached itself to a rock covered in algae during high tide and had failed to swim back out with the receding tide. We found it at low tide, this means it must have ...
Xavi's user avatar
  • 101
7 votes

What's the relationship between snail movement and rain?

The movement of organisms towards water is termed hydrotaxis. 'Hydro-' refers to water and '-taxis' refers to movement. Hydrotaxis has been investigated in animals such as the nematode Caenorhabditis ...
Jam's user avatar
  • 1,506
5 votes
Accepted

What kind of hot pink eggs are these?

Those appear to be the eggs of a species of apple snail in the genus Pomacea, probably the introduced invasive golden apple snail (Pomacea canaliculata), but there are at least two other candidates1,2....
tyersome's user avatar
  • 5,598
5 votes

Is this some kind of parasite crawling about in my yard?

It looks like a terrestrial ribbon worm. https://upload.wikimedia.org/wikipedia/commons/a/ad/Terrestrial_Ribbon_Worm_%28Nemertini%29_%2822799575773%29.jpg Nemertean worms are not leeches, but a ...
Willk's user avatar
  • 2,964
4 votes
Accepted

Do cuttlefish know how to mimic animals since the moment they are born or do they learn by observing?

I haven't been able to find any definitive research/answers, but, based on the usage of their mimicry (camouflage and sexual), and some of its features (alteration of the surface texture of their skin,...
Maurey's user avatar
  • 146
4 votes

What is this agglomeration of pink cells I found attached to a stone?

This could very well be the eggs from an apple snail (family Ampullariidae). According to Wikipedia Several apple snail genera (Pomacea, Pila and Asolene/Pomella) deposit eggs above the waterline ...
theforestecologist's user avatar
4 votes
Accepted

What is this agglomeration of pink cells I found attached to a stone?

They are Apple snail's eggs; check the picture: Check this.
Muath's user avatar
  • 357
3 votes

What is the relationship between snails/slugs and clams/mussels?

There isn't that much easy information for snails and clams, They diverged 550 million years ago, and their anatomies are well studied. If it wasn't for genetic evidence perhaps not all scientists ...
bandybabboon's user avatar
  • 10.4k
3 votes

What is the relationship between snails/slugs and clams/mussels?

The Tree of Life web Mollusc page shows that gastropods (snails/slugs/etc.) and bivalves (clams/mussels) are two of the major groups within Mollusca: You can click through to get more detail on the ...
Ben Bolker's user avatar
  • 5,354
3 votes

Is this a variety of banana slug (Ariolimax columbianus)? (California)

Banana slugs are comprised of three species: Ariolimax californicus Ariolimax columbianus Ariolimax dolichophallus Ariolimax columbianus, or the Pacific banana slug is known to have black spots, ...
hamilthj's user avatar
  • 921
2 votes

What determines the colors and patterns of a clam shell?

We were wondering the same thing after a day at the seaside. It's apparently pretty complicated. Here are a couple of articles I found about it. https://academic.oup.com/mollus/article/72/2/157/...
Stacey's user avatar
  • 21
2 votes
Accepted

Im trying to find out what type of snail this is

I'm guessing it's an invasive apple snail, popular in fish tanks. http://texasinvasives.org/animal_database/detail.php?symbol=15 https://www.youtube.com/watch?v=Pi2wcFPPJsI Some people keep apple ...
bandybabboon's user avatar
  • 10.4k
2 votes

Shell in garden snail

The snails enlarge the shell by adding material at the lip. The addition of material is sometimes noncontinuous and shows up as rings, sort of like tree rings. You can see the growth rings in this ...
Willk's user avatar
  • 2,964
2 votes

Sex determination in cephalopod?

So far, you're right in that there is no hard method of determining cephalopod sex determiners. Male and female share the same number of chromosomes, but are morphologically different, with the male ...
Amut's user avatar
  • 121
1 vote

What is this sea shell?

It is not /Bolma rugosa/, but in fact /Angaria delphinus/, from the Indo-Pacific. Listing on gastropods.com
rpx's user avatar
  • 77
1 vote
Accepted

Why does the funnel-mantle locking apparatus exist, and how / why does it work?

Argonauts and other octopuses have a muscular mantle which is the outside of much of the body other than the arms. A cavity is formed by the mantle in which the gills are located. Water is pulled ...
mgkrebbs's user avatar
  • 9,054
1 vote

Aquarium snail identification

These are a kind of ramshorn snail, as Jestep correctly guessed. Now they are grown up and they are clearly identifiable as ramshorn. I will post photos of adults when I get the opportunity.
Szabolcs's user avatar
  • 475
1 vote

How do we know that ammonites are a kind of cephalopod rather than another type of mollusc?

I am proud that I can answer your very, very good question! You are right that the soft tissue of ammonites is very, very rare. But along with beaks (I believe you meant aptychi) you can find ...
Petr Hykš's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible