Questions tagged [invertebrates]

A paraphyletic classification for animals lacking a vertebral column.

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Effect of myelination on inteligence in cephalopods

Cephalopods are known for their unique intelligence compared to other invertebrates. The number of neurons of cephalopods is of the order $5*10^8$, similar to dogs. Humans have about $10^{11}$ ...
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Can anyone please identify this?

We saw this leech like worm in Kerala, India. Can anyone identify it for us? I saw it today, 10th September. It's about 6 to 7 centimeters long. It was very still, didn't move while we went close and ...
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Can prawns and lobsters live out of water for more than six hours? [closed]

I live in Telangana which is a state of India.I like eating Non-vegetarian food.People of our state eat pond fish more comparing to other aquafood.In many places near me,I've seen people cutting alive ...
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Database for Macroinvertebrate Taxonomy

I compiled different data sets of invertebrate occurrences across some countries and now I want to ensure that all the taxonomic information is homogenized and correct. To this end, I am looking for a ...
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What is this African bug?

This is an arthropod I found in an apparently abandoned mongoose burrow in the Maasai Mara game reserve, Kenya: That was the best photo I could get of it. From what I could tell, it had six legs and ...
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Why do leeches lose septae due to parasitism?

So I found this piece of information in my textbook without a proper explanation, and I can't seem to find the relation between the two.
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Species identification. Is this a leech?

The pictured creature, shown at the bottom of a glass, was attached to a friend’s child after he was swimming in the Ottawa River today. It stretches out to roughly an inch in length but in this “...
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Bug Identification: Tiny Bugs in Fairport NY

We have been finding a ton of these tiny bugs (pin head size or smaller) outside on our patios, outdoor tables, on the grill, etc. What are they and how do we get rid of them?
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Want to know about a creature which bite me

I am Sachin from MP India. Few minutes back I have gotten bite by a creature. What is its name? Is it harmful if I got bitten by it? Feeling little pain there.
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Help with jellyfish species identification

Our research group (Evolutionary Genetics Group, University of Zurich) has received a letter from a special needs child who has kindly asked us to identify three jellyfish species. Unfortunately, the ...
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Life cycle of Ascaris worms

Why do Ascaris larva move to the epiglottis from the lungs only to come down with food to the small intestine and become an adult?
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Carbon Dioxide, sea water, diatoms, and oxygen

I recently viewed a documentary called “Flying River Observed in Tallest Structure in South America, National Geographic” (https://www.youtube.com/watch?v=HjpPsZTwsaM). In this film, as an aside, it ...
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What is the largest species of polychaete?

My Google searches seemed to avail no results. My question is: What is the largest living species in the class Polychaeta? That's about it. I understand that there will be few accessible weights for ...
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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 ...
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151 views

What is the reason behind the subphylum name “Urochordata” for tunicates?

There are two major invertebrate subphyla of the chordates (phylum Chordata): Cephalochordata (the lancelets) Urochordata, aka Tunicata (the tunicates) My understanding is that the cephalochordates ...
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333 views

What are these tiny creatures swimming around my aquarium?

I was checking out my aquarium today, and decided to scoop out a water sample and take a look at it more closely. What I discovered were numerous, very, very tiny white worms (?) swimming around in ...
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Identification of a small flat bug

So for the last few days I have been noticing these small bugs in my bathroom -- they don't appear frequently, and I see them once or twice a month. The characteristics and behavior I observed are as ...
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Help in identifying marine specimen?

I came across this specimen which I assume belongs toeither the phylum porifera or to the coelenterata. Can someone please help me identify it? The specimen was found in Ayodhya, India.
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What are these bladder snail parasites?

I collected some bladder snails several months ago. While checking them out one day, I noticed that they were now infested with worm-like ectoparasites. Appearance and behavior Here's a picture of a ...
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research on brain-eating amoeba

Are there any alternative treatments for brain-eating amoeba? I've spent about 6 hours trying to find information about this and haven't had any success.
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What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
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How do insects recognize their host plants?

Many insects, like butterflies have specific host plants on which they feed or lay eggs. While researching about some butterflies, I found that they lay their eggs on certain specific plants and their ...
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What kind of sieve does one use to extract meiofauna?

Suppose I have a core of sediment, and I want to extract the meiofauna from it, in order to study these organisms. According to the sources I could find, this involves using a very fine (e.g. 45 μm) ...
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How did craniates evolve?

Looking at most chordate phylogenetic trees, it seems that we usually have something like this: ...
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Looking to identify this species

I found a rather strange invertebrate...something... outside my home this evening, and I have no idea what it might be. It looks kind of like a small brown lobster, without the claws. I think it has 8 ...
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Anyone know what this it?

More than 1 washed up on a beach in Ireland..close to some big jellyfish
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247 views

Do hornets remember and recognize a human? Do they have any (kind of) memory?

hornetology So it happens that a hornet (vespa crabro) flew inside my house today and now is being held in a plastic container (I made some holes to let it breathe). But it also happens not just this ...
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292 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?
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181 views

Help in identifying an unknown Golden Worm/Larvae

Can anyone help me to recognize this type of species? Is it a clustered worms or clustered larvae? Location is in Bali, Indonesia. Recently this species is goes viral, but people here always link this ...
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What is this strange horned, slug-like coral reef dwelling creature?

On the first episode of BBC's Blue Planet II they visited a coral reef and showed some odd reef-dwelling creatures as part of their establishing shots, but they did not identify the creatures. What ...
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253 views

Any latest edition or successor of “Invertebrate zoology” by Ruppert & Barnes 2003?

I have the 6th edition of the textbook "Invertebrate Zoology" by Ruppert and Barnes from 1993. I know there is a 7th edition from 2003, but is there and will there ever be a 8th edition? Assuming they ...
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985 views

Did radial symmetry evolve twice?

In the history of animal evolution, both the Cnidarians and the Echinoderms have radial symmetry, according to this cladogram: Source: http://www.cpalms.org/Public/PreviewResourceLesson/Preview/45851 ...
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Cockroach brain functional anatomy

In insects like the cockroach the brain is distributed, i.e. some parts lie in the head and some in the abdominal cavity. Which part is responsible for controlling locomotion?
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51 views

Im trying to find out what type of snail this is

The snail is pretty large and located in texas.
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Are baby centipedes poisonous like the adults?

I know that centipedes have an appendage called "poison claw".But I am not sure if the same is there in the baby centipedes and if its functional like that of the adults. So are baby centipedes ...
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439 views

Swarming red millipedes found near my home

Location:Hyderabad,South India. These worms usually come out when it rains,these worms are the most common ones any help in figuring out them,they come in groups too.
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What spider is this in Idaho?

I have killed maybe 5 of these little bastards as I have a 3 year old and dont want her bit. Should be able to zoom in quite a bit. Just hold CTRL and hit the plus symbol. Whitish top brown legs ...
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Species identification - what kind of worm is this?

I am finding these worms in my bathroom since summer arrived. I have been finding these on floor, walls and damp towel I left hung overnight in bathroom couple of times. When these worms are squished, ...
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Can you identify this fossil?

I found this fossil near a beach in Victoria, Australia. Can anyone identify it? It is roughly the size of an Australian 20 cent piece (~30 mm). I think it might have been washed down from an eroding ...
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172 views

Which kind of caterpillar is this?

Which caterpillar is this? It was found in mid Europe during this time (April). Size about 2cm in length.
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ID a shell from Puerto Rico

I recently found this in Rincon Puerto Rico on the beach. I assumed it was a baby sea turtle shell or some kind of turtle. Someone that frequents Puerto Rico said it was not. Does anybody know what ...
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1answer
702 views

Identification of colorful jelly-like marine creature

I'm on my trip to Gulangyu Island, Xiamen, Fujian Province, China. Today(4th February 2017), at 12:13 A.M., I saw a beach filled with huge rocks on which various dry shells reside. Among the shells, I ...
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Can certain jellyfish photosynthesize in the medusa stage?

Can jellyfish (at least some of them) do photosynthesis in the symbiosis with zooxanthellae in their medusa form as well? I've heard that only Cassiopea andromeda can but I wasn't able to find a ...
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133 views

How do you determine the length of an annelid?

I'm currently studying a horse-leech, and would like to know if it is fully grown or not. When I read about different annelid species a maximum length is often given, so I wonder if there is some ...
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232 views

Species identification - greenish blue ocean worm (nudibranch?) in Perhentian Islands, Malaysia

We found this on a beach at the Perhentian Islands, Malaysia in March, 2016 and cannot identify it. It's some sort of worm-type creature with many legs and bluish back about 15cm long. The legs ...
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What happens to a snail if we cut off its antennae?

First off, I don't know why snails have antennas. Are they eyes? And what if we cut those antennae off? If they are like eyes, could a blind snail survive somehow?
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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 ...
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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 ...
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749 views

What is the role of gills in terrestrial Crustaceans?

Why do Crustaceans that live on land have maintained their gills? In aquatic species, the gills play a pivotal role in respiration, but terrestrial crustaceans have tracheal lungs. So why do they have ...
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Why do crabs spit?

Last year I photographed this juvenile Sally Lightfoot Crab (Grapsus grapsus) 'spitting' (click for larger view): I thought I'd look up more information on this behavior, but couldn't find any ...