Questions tagged [invertebrates]

A paraphyletic classification for animals lacking a vertebral column.

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1answer
172 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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1answer
525 views

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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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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1answer
21 views

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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33 views

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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1answer
167 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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1answer
97 views

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.
3
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1answer
279 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.
2
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1answer
73 views

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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2answers
57 views

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?
5
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1answer
261 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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144 views

What is this underwater creature?

West Bali, about 10 meters deep. Body is roughly 10 cm across. Does not move.
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1answer
113 views

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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1answer
65 views

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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1answer
46 views

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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14 views

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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1answer
194 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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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 ...
4
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1answer
299 views

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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45 views

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 ...
4
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2answers
84 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 ...
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1answer
128 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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1answer
246 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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1answer
569 views

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
52 views

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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2answers
906 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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51 views

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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33 views

How did craniates evolve?

Looking at most chordate phylogenetic trees, it seems that we usually have something like this: ...
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49 views

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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2answers
10k views

Do octopuses have better eyes than humans?

I've read that unlike humans, octopuses have eyes "designed" the "right way", i.e. with the nerve fibers behind the retina, thus getting rid of the blind spot we humans have as well as theoretically ...
6
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1answer
329 views

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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1answer
209 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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2answers
83k 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 ...
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2answers
254 views

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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60 views

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 ...
6
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1answer
815 views

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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1answer
50 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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2answers
704 views

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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2answers
2k views

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 ...
2
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1answer
128 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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1answer
3k views

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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2answers
288 views

Selection for less efficient egg transfer in Human Botfly life cycle

I have heard that the Human Botfly transfers its eggs through other invertebrates, and it strikes my curiosity that if an insect could simply land on its host directly to deposit its eggs, then why ...
8
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1answer
4k views

What biological constraints are there on how large a spider can grow?

Spiders fascinate me, but what intrigues me the most is just how big some spiders can get, which leads me to my question. What biological constraints (if any) would limit how large a spider could grow,...
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2answers
3k views

Spider identification

This red spider has set up a web in my yard, in South Eastern, Texas, United States: The spider itself is about an inch long (2.5 cm), and is predominantly red to brown in color, with red legs, and a ...
14
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1answer
699 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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442 views

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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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 ...
15
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1answer
4k views

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 ...
4
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1answer
229 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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1answer
709 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 ...