Giant lawn shrimp, also known as terrestrial amphipods, are fascinating crustaceans commonly found in gardens and lawns. They inhabit moist areas like the surface of mulch or wet ground, and are usually seen after rainfall when they migrate into garages or under doors of houses 1.
Despite their name, these small creatures are not actually shrimp but are related to them. They play an essential role in breaking down organic matter and contributing to the health of your garden’s ecosystem. Keep reading to learn all about these intriguing little critters and their fascinating habits.
What Are Giant Lawn Shrimp?
Giant lawn shrimp, also known as terrestrial amphipods, are small crustaceans that can be found in gardens and moist soil. They are not actually shrimp but belong to the same class, Crustacea.
These critters are native to Australia but can be found in various regions around the world. A distinctive feature of lawn shrimp is their brown color, which helps them blend into their environment.
Unlike other crustaceans, lawn shrimp have relatively simple structure:
- They possess two pairs of antennae
- Their bodies are laterally compressed, which means they are flattened from side to side
Giant lawn shrimp inhabit the top layers of moist soil or leaf mold, usually no deeper than 13mm. They particularly enjoy mulch and damp ground.
Here’s a quick comparison of giant lawn shrimp and typical crustaceans:
| Feature | Giant Lawn Shrimp | Typical Crustaceans |
|---|---|---|
| Habitat | Soil, gardens | Aquatic environments |
| Color | Brown | Various |
| Size | Small, up to 20mm | Varies |
| Structure | Simple | Complex |
In conclusion, giant lawn shrimp are small, brown crustaceans that dwell in moist soil and gardens. They have a simple structure and are a unique member of the Crustacea class.
Habitat and Natural Environment
Wetter Climates and Moist Environments
Giant lawn shrimp, also known as terrestrial amphipods, are commonly found in wetter climates and moist environments. These tiny creatures are drawn to areas with high levels of moisture, making them prevalent in places like California during the rainy season. They thrive in moist environments like wet topsoil, mulch, and grass-covered areas. Some key points to note about their habitat:
- Prefers moist and wet environments
- Often found in fertilized soil
- Common in grassy or mulched areas, especially after rain
Decomposing Leaves and Organic Material
These harmless nuisances are known to feed on decomposing leaves and organic material. They play a role in breaking down dead plant matter, contributing to the ecosystem as decomposers. They are often found near areas with leaf litter or decaying matter, such as:
- Beneath layers of dead leaves
- Moist ground covered with organic materials like mulch
- In damp gardens with plenty of decaying plant matter
Here’s a comparison table of their habitat preferences:
| Habitat Feature | Lawn Shrimp Preference |
|---|---|
| Climate | Wetter |
| Environment | Moist |
| Soil | Fertilized, Wet |
| Ground Cover | Mulch, Grass |
| Presence of Dead Leaves | High |
While some people may dislike the sight of these amphipods or find them as a mild nuisance, it’s essential to note that they are harmless creatures that do not pose any significant threat or infestation risk to homeowners.
How to Identify Lawn Shrimp
Physical Characteristics
Lawn shrimp, also known as terrestrial amphipods or Arcitalitrus sylvaticus, are small crustaceans with some distinct features. Here is a list of their physical characteristics:
- Exoskeleton: Unlike other shrimps, lawn shrimp don’t have a hard outer shell.
- Flat bodies: Their bodies are flattened from side to side, which helps them move through their habitats.
- Black eyes: These tiny creatures have black eyes, which are easy to spot during close examination.
- Size: They usually live on the surface (top 1/2 inch) of mulch and moist ground, growing up to 13 mm in length 1.
Behavioral Traits
Understanding the behavioral traits of lawn shrimp will assist you in identifying them. Some of their behaviors include:
- Moisture-seeking: Lawn shrimp thrive in humid, damp environments, such as leaf mold beneath shrubbery or wet ground 1.
- Migration: After rains or in damp conditions, they may migrate into garages or under doors of houses 1.
- Nocturnal: Lawn shrimp are mostly active during the nighttime, hiding under rocks or debris during the day.
In conclusion, identifying lawn shrimp mainly involves recognizing their physical characteristics, such as their exoskeleton, flat bodies, black eyes, and size. You should also consider their behavioral traits, such as seeking moist environments, migration, and nocturnal activities, to distinguish them from other creatures.
Do Lawn Shrimp Cause Damage?
Impact on Gardens and Flower Beds
Lawn shrimp, also known as terrestrial amphipods, are small invertebrates that can be found in moist environments, such as gardens and flower beds. They feed on decaying plant materials, making them omnivores. While their presence may initially seem harmful, these tiny creatures actually contribute to breaking down organic matter and can be considered beneficial in some ways.
However, in large numbers, lawn shrimp may cause damage to delicate plants and flowers. They generally do not cause significant damage to healthy and established plants in the garden.
Concerns for Pets and Humans
Lawn shrimp are not known to pose direct threats to humans or pets, as they lack a biting or stinging mechanism. However, some people may be concerned about their pets accidentally consuming these small invertebrates. Fortunately, the carapace of lawn shrimp is hard and unappetizing to most pets, making it unlikely that they would eat them.
It’s essential to avoid using pesticides to control lawn shrimp populations, as the chemicals could be more harmful to your pets than the invertebrates themselves. Instead, consider using non-chemical methods, such as reducing excess moisture in your garden and removing decaying organic materials. This will not only help control the lawn shrimp population, but also promote a healthier garden environment.
Comparison Table: Lawn Shrimp vs. Springtails
| Features | Lawn Shrimp (Terrestrial Amphipods) | Springtails (Collembola) |
|---|---|---|
| Size | Up to 13mm | 1-7mm |
| Habitat | Moist ground, gardens, leaf mold | Soil, leaf litter, and various damp areas |
| Diet | Omnivores, feeding on decaying plants | Fungivores, detritivores, and herbivores |
| Effect on plants | Minimal damage to healthy plants | Generally harmless to plants |
| Impact on humans | No direct threat, may cause mild concern | No direct threat, usually go unnoticed |
| Control methods | Non-chemical, reduce moisture, remove debris | Same as for lawn shrimp, maintain dry habitat |
Controlling and Preventing Lawn Shrimp Infestations
Pest Control Methods
Lawn shrimp, also known as terrestrial amphipods, are tiny crustaceans that can be found in moist environments in your yard. To control and prevent their infestations, consider the following methods:
- Insecticides: Apply appropriate insecticides to affected areas. Consult with a local expert or garden center for the best product for your specific situation.
- Natural predators: Encourage natural predators, such as birds, by setting up bird feeders or birdbaths in your garden.
Maintaining a Dry and Healthy Garden
Creating an unfavorable environment for lawn shrimp can be an effective way to prevent infestations. Keep the following tips in mind:
- Avoid overwatering: Lawn shrimp thrive in damp areas, so it is essential to prevent overwatering your plants and lawns.
- Proper drainage: Ensure proper drainage in your garden by leveling the area, adding gravel or sand to heavy clay soils, and installing drainage systems if necessary.
- Moisture levels: Regularly check your garden’s moisture levels, especially during wetter climates and periods of inclement weather.
- Remove organic material: Lawn shrimp feed on algae, fungi, and decaying organic material. Regularly clean up wet leaves and debris to reduce their food sources.
Pros and Cons of Lawn Shrimp Control Methods
| Method | Pros | Cons |
|---|---|---|
| Insecticides | Effective in eliminating lawn shrimp | Chemicals can harm the environment |
| Natural predators | Environmentally friendly | Less control over their effectiveness |
| Proper drainage | Prevents other moisture-related issues | May require significant garden work |
| Moisture level monitoring | Helps maintain a healthy garden | Requires regular attention |
By adopting these pest control methods and focusing on maintaining a dry and healthy garden, you can effectively reduce the risk of lawn shrimp infestations and keep your outdoor space looking its best.
Interesting Facts and Uses of Lawn Shrimp
Lawn shrimp are actually terrestrial amphipods and are not related to prawns, lobsters, or cooked seafood shrimp. They live on the surface of mulch and moist ground, usually up to a depth of 13 mm. Their habitats can be found in gardens, often beneath shrubbery.
These creatures are also known as beach fleas due to their hopping behavior. They play a significant role in the ecosystem, acting as decomposers and helping maintain soil health. After rains, they might migrate into garages or under doors of houses.
Fish enthusiasts might find lawn shrimp useful as they can serve as live food for their fish tank or ornamental pond inhabitants. These amphipods are a nutritious part of the food chain for creatures like fish and birds.
Comparison table:
| Lawn Shrimp | Cooked Seafood Shrimp |
|---|---|
| Terrestrial amphipods | Aquatic crustaceans |
| Live in moist ground | Live in water |
| Mainly decomposers | Mainly detritivores |
| Serve as food for fish | Popular human food |
Lawn shrimp can be found in certain types of aquarium setups as well, where they assist in breaking down organic matter. However, they’re not suitable for all tank environments.
Pros:
- Provide natural food source for fish and birds
- Help in decomposition process
Cons:
- May enter homes after rain
- Not ideal for all aquariums
In summary, lawn shrimp are interesting creatures that play a role in ecosystems and can provide benefits to fish tank and ornamental pond inhabitants. Just remember to consider their habitat requirements and potential drawbacks before introducing them to your own garden or aquarium.
Footnotes
32 Comments. Leave new
I’ve had a few of these in my carpet by the backdoor. I live in Orange County and yes its been raining for a few days now.
I keep finding them in my pool. What can I do to keep them out? Where are they coming from?
It is our understanding that the introduced Lawn Shrimp thrive in well watered landscaping. You can try watering less to see if that helps.
We have these “Lawn Shrimp” in Texas as well !! I never knew what they were until I looked them up on your website !!
I’m surrounded by houses with pools. Is it possible I am just seeing these lawn shrimps now because of the drought
By the way I am in Yuba City California
Lawn Shrimp have been in North America for many years. Populations will vary with weather conditions. In arid regions, they can only survive in irrigated landscapes.
I have found them all over my wool carpeting and it looks like they have eaten sections of it down to the base. I keep vacuuming them up, then they are back the next morning. Do they eat the wool fibers?
To the best of our knowledge, they do not eat wool. You may have carpet beetles or clothes moths doing the damage.
They keep getting into my fountains and clogging the motor—a real pain.
I find these, identical to the photo, in clusters of fifty or more on my screened in porch. The porch is above ground. I have no idea how they get in. They also appear every day on my back open patio, always dead. When I sweep them away, new ones appear the next day. There are hundreds. I have never seen a live one. I live in North Florida. It’s good to finally have identified them but kind of sad to see them always dead.
Looks like I got these buggers here in South Jersey.
I had one crawling up the inside of my pant leg last week and now I’m counting about a dozen dead ones on the dining room floor this morning.
Looks like I got these buggers here in South Jersey.
I had one crawling up the inside of my pant leg last week and now I’m counting about a dozen dead ones on the dining room floor this morning.
I am in N. Ireland and recently finding these dead on my Conservatory Floor.
hi im from South Africa, and we only just moved into a new house, and discovered these bugs in my living room area and the kitchen, what i would like to know is , are they dangerous and do they bite? i have small children???
They are not dangerous.
Well I have been seeing these in my yard lately I’m from baxley and I never knew what they where till I just look them up it’s been raining a lot here the last few weeks is that why they’re around
Can lawn shrimp live and survive inside a human body? I can’t seem to find any information
on this.
Can lawn shrimp live and survive inside a human body? I can’t seem to find any information
on this.
We are guessing they cannot.
Hi, I just discovered one shrimping around inside my tank! I bought some plants from Pets Warehouse weeks back and thought I’d seen movement in the grasses they’d sold me. At first, I thought it was some hideous predator that would hunt my fish in the night and kill off my shrimp, but I’m happy to learn that it’ll be a little helper for as long as it lives among the plants, as well as any others I may have mistaken as the same critter.
Actually quite a shy, graceful swimmer and not only a “slow” climber like some websites state.
I just found two of these “lawn shrimps” at the doorsteps at home in Sao Paulo, Brasil. I’m 60, and have NEVER seen these bugs in my life. And let me tell you, I have 15 “micos”( little monkeys) visiting almost every day here,( have no idea where they come from, but they use the green corridors in the city) so I’ve seen a lot of “wild life” in my garden!? But shrimps was a first!? What do they eat? Are they harmful to the garden/lawn in any way? It has been raining a lot here and it’s insanely hot also! Thank you for this page! My son in law found it and showed me.
According to BugGuide, their food preference is “Dead organic matter in the soil, especially eucalyptus” and “These are rarely seen except when flooding or lack of moisture forces them to abandon their home in the soil in search for suitable conditions. At such times they often end up dieing on pavement or in homes and become a nuisance. Once they start appearing, there’s not much that can be done except to sweep them up- pesticides are pointless, bcause by then they’re already dying or dead.
“
I’ve lived in Southern California my whole life and this winter is the first time I’ve seen these creatures. It has been a very wet winter. With the name lawn shrimp, I’m wondering if they do damage to the lawn or surrounding plants.
It is our understanding that they are more of a nuisance than a threat to your garden.
Well, I am in Cornwall, UK and finding these little dead guys all over the ground floor of a 4 year old block of flats. Only on the entrance floor of a 3 storey and always dead! Have no idea where they are coming from or how they get in but have noticed them for the past 7/8 months! Weird!
My boyfriend’s parents just found a mass of these lying dead on their living room floor. The room is in the front of the house, surrounded by patio/lawn areas on two sides. We had VERY slight rain the night before last, and that came after a solid month of uncomfortable warm temperatures. What gives? Why now? His folks have been in that house for 20 years, and this is the first time they’ve seen anything like this. I am not necessarily fearful of insects like these, but I am utterly REPULSED…yet can’t look away. Like, I’m nauseous & itchy all over, but fascinated. If they swept them all up, will they come back? Do they lay eggs in carpet? Would love any guidance you have! I’ve told my boyfriend I refuse to go have dinner there until I get some answers, LOL… ???
My boyfriend’s parents just found a mass of these lying dead on their living room floor. The room is in the front of the house, surrounded by patio/lawn areas on two sides. We had VERY slight rain the night before last, and that came after a solid month of uncomfortable warm temperatures. What gives? Why now? His folks have been in that house for 20 years, and this is the first time they’ve seen anything like this. I am not necessarily fearful of insects like these, but I am utterly REPULSED…yet can’t look away. Like, I’m nauseous & itchy all over, but fascinated. If they swept them all up, will they come back? Do they lay eggs in carpet? Would love any guidance you have! I’ve told my boyfriend I refuse to go have dinner there until I get some answers, LOL… ????????????
*I should have added that we’re in Los Angeles.
Ugh! I get them on my front porch and screened in back porch the last few years! I live in Myrtle Beach, SC. We have had a lot of rain lately so it makes sense I have seen so many lately!
I’ve just seen these in my carport for the first time in 15 years, here on the Big Island of Hawaii….after months of daily rain, which is very unusual for this part of the island.
I had them twice in my kitchen this morning yucky I’m from Michigan originally never in my life seen these I’m in Florida and I see the weirdest bugs