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Crustaceans

Usually considered as a subphylum, Crustaceans comprise a group of arthropods including crabs, crayfish, lobsters and shrimp. Most crustaceans are aquatic animals, though some are terrestrial, parasitic and barnacles. Crustaceans have a chitinous exoskeleton, segmented body, and paired jointed limbs.

1,209 Questions

How do tiny krill sustain whales?

Krill swarms are easy 2 million strong. so imagine of a whale runs into a few swarms. The gorge themselves oin it, whales can eat 3 tons of krill a day! But also whales store alot of fat. A mother whale will taker her calves to safe water for the calf to grow strong and can so 5 months with out eating. If you are really interested you should watch planet earth shallow seas show.

How do you think tiny krill provide enough food to sustain whales?

The reason they can provide enough food is because whales eat so many of them (10-15 tons).

Almost all animals except what have either radial or bilateral symmetry?

Almost all animals except sponges have either radial or bilateral symmetry. Sponges belong to the phylum Porifera, characterized by their lack of symmetry.

How many females can 1 male freshwater crayfish get pregnant?

None. In crayfish, females become fertilized externally by mating with males. The male transfers sperm to the female, who then stores it until she is ready to fertilize her eggs.

How many pairs of uropod on a crayfish?

A crayfish typically has two pairs of uropods. Uropods are appendages located at the end of the abdomen that help with swimming and stability in water.

Larval stage of mollusks and annelids?

The larval stage of mollusks is called a trochophore, which is a free-swimming, ciliated larva that eventually develops into the adult form. For annelids, the larval stage is called a trochophore or a nectochaete, which also metamorphoses into the adult form after a period of growth and development.

Function of chitinous teeth of crayfish?

Chitinous teeth in crayfish help them grasp and manipulate food as they feed. These teeth are used to crush and grind food items, making it easier for crayfish to consume their prey. Additionally, chitinous teeth aid in the breakdown of food particles during digestion.

What is the function of the uropod in crayfish?

A uropod is used for swimming. Telson does the same thing.

Why are some lobsters one claw bigger than the other claw?

Some lobsters have one claw larger than the other due to a phenomenon called bilateral gynandromorphy, where individuals have both male and female characteristics. This can result in one side having a larger claw typical of a male lobster, while the other side has a smaller claw like a female lobster. It is a rare occurrence in crustaceans.

How do crayfish find food?

Try some regular fish food. I used to have crayfish and I used to feed them fish food. When I fed the crayfish fish food I took them out of their tank and put them in a container with some water and fed them the fish food in the container. I did this so the the fish food won't make a mess in the tank. If the fish food floats on the top of the water stir it around and the food will fall to the bottom.

Is a millipede a crustacean?

No, a millipede is not a crustacean. Millipedes are arthropods belonging to the class Diplopoda, while crustaceans belong to a different class called Malacostraca. Millipedes are characterized by having many legs and a cylindrical body, while crustaceans have segmented bodies and many possess a hard exoskeleton.

What fossil looks like a spiral or a rams horn?

The ammonite fossil has a spiral shape similar to a ram's horn. Ammonites were marine creatures that lived millions of years ago and had coiled shells. These fossils are often found in sedimentary rocks and are prized by collectors for their intricate shapes.

Are lobsters single or multi-celled?

Multi because they are living and breathing. Something like a rock would be single celled.

Why can't brine shrimp live in fresh water?

Brine shrimp are adapted to living in highly saline environments, so they require salt in their water to maintain proper bodily functions. Without the salt, their cells would not be able to regulate water balance correctly, leading to dehydration and eventual death.

Does a sea urchin have radial symmetry or bilateral symmetry?

A sea urchin has radial symmetry, meaning it is symmetrical around a central axis, like a wheel. This symmetry allows them to have multiple planes of symmetry passing through the central axis, giving them equal parts around the center.

Are prawns omnivores?

Prawns are opportunistic feeders that typically consume a variety of plant and animal matter, making them omnivores. They scavenge for detritus on the ocean floor but also feed on smaller organisms like plankton and small fish.

What structure are the gills of a crayfish attached to?

The gills of a crayfish are attached to the base of the legs, specifically the appendages of the abdomen. Each pair of walking legs has a branchial chamber where the gills are located.

How do hermit crabs fight?

Hermit crabs fight by using their claws to pinch and grab each other. They may also use their shell as protection and shelter during fights. The goal of the fight is often to establish dominance or access to resources such as food or mates.

What is the function of a crayfish's antenna?

The crafish's antennules are the smaller antennas and they aid in balance and provide taste and touch. The larger antennas called the antennae are much more sensative then the antennules, providing the crayfish stronger sense of taste and touch.

How do you string a brine clutch?

I would suggest a railroad pattern. 2 leathers down the sides, mesh only in between leathers, three shooting strings. I would suggest a railroad pattern. 2 leathers down the sides, mesh only in between leathers, three shooting strings.

Why are crayfish classified as protostomes?

Crayfish are classified as protostomes because they are a type of invertebrate animal that develops their mouth before their anus during embryonic development. This characteristic is a key feature of protostomes, which also includes other invertebrates like insects and mollusks.

Why are there only 3-5 trophic levels in an ecosystem?

There are only a few trophic levels in an ecosystem because as a trophic level consumes, it only reiceves 10% of the energy in the previous level.

There are only few trophic levels because as the feeding levels continue (like grass --> rabbit --> hawk) energy is lost. Most of it, you learn, is lost through heat. By the time it gets to the top level, there just isn't enough energy to continue the food chain. (that's what that is). I know its hard to imagine that grass has more energy than a hawk but the grass gets energy from the sun which is a lot of energy. The person before did mention the 10% thing which is also true.

What is the name of this animal that spends its larval stage inside a seed pod?

This animal is called a seed beetle (Megalotomus quinquespinosus). It lays its eggs inside developing seeds or pods, and the larvae develop within the seed pod before emerging as adults.

What does a crayfish eye look like?

A crayfish eye is small and typically black in color. It has a compound structure with many tiny lenses that allow the crayfish to see movement and changes in light. They are located on stalks on either side of the crayfish's head.

Do roly polys hibernate?

Roly polys, also known as pill bugs or woodlice, do not truly hibernate. Instead, they enter a state of dormancy during harsh conditions, such as extreme cold or drought. They can survive by finding a sheltered spot or burrowing underground until conditions improve.