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Questions tagged [molluscs]

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4
votes
2answers
75 views

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

Photo taken in a garden in Singapore. The organism is attached to a stone, close to water. Many of these were there. Size approx 3cm. The shell of this eggs is very soft. When touched, a pink ...
5
votes
1answer
62 views

What's the relationship between snail movement and rain?

I have a question about the relationship between snail and rain. A few days ago I found snail shells in a moist area and I brought them in for crafts work (I thought they were empty because snail ...
2
votes
0answers
35 views

(Aquatic gastropod) Physae identification

I need help to identify a physa. What are the identification keys to make the difference between: physa fontinalis, physa marmorata , physa acuta (syn. Physella acuta) The difference ...
3
votes
1answer
209 views

Sex determination in cephalopod?

I see some source say octopus do not have sex chromosome. So what's the sex determination mechanism for cephalopods?
0
votes
1answer
38 views

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

I was looking up argonauts, and found this article. As someone who builds things for a living, I was intrigued, but could find no information on how it actually functions in order to help the ...
1
vote
0answers
30 views

What percentage of genome do slugs and scallops have in common?

We can know genetic distance of thousands of species. The OTT tree of life gives genetic distance for nearly all species. Is there a resource to compare the genomes of any sequenced animals to know ...
2
votes
2answers
235 views

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

Slugs and clams are both phyla in mollusca, but how can I tell which features they inherited from an ancestor? Basically, I'm curious about how excatly these organisms are related but can't find any ...
1
vote
1answer
49 views

Im trying to find out what type of snail this is

The snail is pretty large and located in texas.
2
votes
1answer
145 views

Shell in garden snail

I was wondering that how does shell of garden snail "grows " with growth of snail. Small snail possess shell as its size but as it grows shell grows. How do they enlarge cavity inside shell?
7
votes
1answer
164 views

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

I can't seem to find information anywhere else so I hope somebody can help me out. So, as the question states, I saw a cuttlefish mimicking a hermit crab the other day and I was wondering if ...
4
votes
1answer
275 views

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

These very dark (dark grey to black) banana slugs are an anomaly. I live on the north coast of California and see many slugs every day. These particular slugs I find only on the west-facing headlands ...
10
votes
1answer
242 views

What species of snail is this?

I found it in Washington state, in a city south of Seattle. I found it next to a bush after it rained on someone's driveway. Here are two pictures of it: ( originally posted in instagram ) If anyone ...
5
votes
2answers
4k views

Can an octopus survive if one of its three hearts stops working?

While reading the book "The Soul of an Octopus" by Sy Montgomery, I learnt that Octopuses have three hearts. This is very fascinating. According to a Wikipedia article, two of the three are used to ...
3
votes
0answers
65 views

Why might the chirality of gastopods be dominantly dextral?

This wikipedia page on gastropods provides a definition of chirality, and briefly describes the genetic mechanisms behind why a shell is wound left (sinistral) or right (dextral) handed. It also ...
24
votes
1answer
14k views

Does the octopus have an anus? What does it look like?

Octopuses are cephalopods, which have separate anal and oral openings. Indeed, descriptions of the cephalopod GI tract clearly depict an anal opening. However, I am very confused about how this ...
29
votes
2answers
77k views

How long can an octopus survive out of the water?

I saw videos of octopuses crawling on the ground and I was wondering how long an octopus can survive when out of the water? Does it depend on either its size (i.e., does a big octopus from deep sea ...
9
votes
1answer
1k views

Aquarium snail identification

Many of these little snails suddenly appeared in our aquarium from nowhere. I suspect that some snail eggs hitched a ride with some recently purchased plants. Can anyone identify the species? I am ...
10
votes
1answer
174 views

What happened to this seashell?

We found this seashell on a Mediterranean beach in the south of France. While most of the shells we found were quite intact, this one caught our attention. It is light and littered with tiny holes, ...
7
votes
1answer
183 views

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

On a recent fossil hunting trip, I found a small fossil that an expert identified for me as an ammonite beak. He told me such fossils are not uncommon, but are not normally found with their parent ...
4
votes
2answers
16k views

Age of shells on beach

As a child I watched tiny fiddler crabs living in conical shells, and many years later I find that people study fossil turritellids. So now I wonder: how old are shells, typically, that you see on ...
8
votes
3answers
4k views

What determines the colors and patterns of a clam shell?

Earlier this week I was looking at some bivalve shells that had ornate patterns which ranged in color from a light orange-pink to a deep orange-red. Here is an image I found online that seems to be of ...