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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
What are two common characteristics of crustaceans?
I'm not sure if you mean their common characteristics, or characteristics that they have in common. Some common characteristics are that they have exoskeletons and they are segmented.
However, they also have some characteristics that they have in common, and some which no other animals have. One of these characteristics is that they possess biramous appendages, which means legs and other appendages which are forked into two pieces, although some crustaceans lose the minor piece of some legs as they mature. The seoncd thing they all have in common is that all of them first pass through a nauplius larval stage.
How long will lobster last in fridge?
This food will only last a few days. 3 days in the refrigerator if the food is stored properly. Place in an air tight container for the best results. You can transfer the food to the freezer if longer storage is needed.
All their legs have similar size and shape.
Roly polys have a number of different named including sow bugs and wood lice. They have two eyes located on the end of their antennas.
When the crayfish is not walking how does water move over the gills?
By using their swimerettes. They create a current of water and then it goes through their gills.
What is an example of an crustacean?
A crustacean is any arthropod with what is known as an exoskeleton. This means they must molt to grow. Examples include lobsters, crabs, and even shrimp.
Does a crayfish have an open circulatory system?
Crayfish, along with all other arthropods, have an open circulatory system. There are no veins and no separation of blood from interstitial fluid.
Do lobsters have amniotic eggs?
No. An amniotic egg is a bird or reptile egg, with a shell. Only vertebrates can have amniotic eggs. ^^
By extention, mammals also have amniotic eggs, but they're reduced in placental mammals (live birth). Platypi and echidnas still lay amniotic eggs though.
What is the analogy for lobster?
In biology the term 'analogy' is used to describe a similar feature in a different organism, which of course is possible for most of a lobster's features. In the loose sense, one might say the freshwater crayfish is analogous to the salt-water lobster.
How do you clean your triops tanks if there are eggs in there that the adults have laid?
It all depends on what you want. In other words, if they are fish eggs do you want more of the same fish that are in the tank - and the same for snail eggs. The kinds of fish you have will tell you about the eggs and where they are found. Sclares (angel fish) deposit their eggs on the glass or a leaf. Cichlids usually drop their eggs into the sand. Siamese fish blow elaborate "egg nests" made of bubbles. A small gel-like patch on the side of the tank is usually snail eggs - unless you have a large snail such as a Mystery Snail.
What can a crayfish do well that a grasshopper cannot do at all?
Use its tail to swim backwards at high velocity.
snapper eat sardines greenies(pilchards or also known as threadfin hearing) and also shrimp and other assorted species. bigger snapper like bigger meals jacks, blue runners, mackeral ,lady fish ,grunts and anything yummy and smaller than them ...a two foot snapper would love a one foot mackeral....they are both smaller than me..... hmmm fiiish
What is the cinus in the thorax of a crayfish?
What you are referring to is the sinus. The crayfish's gills are used to extract oxygen that is dissolved in water and lead it into the crayfish's open circulatory system. This type of circulatory system doesn't limit the blood to blood vessels; instead the blood collects in the pericardial sinus, the cavity surrounding the dorsal heart. (Porch and Batdorf 477) From there the dorsal heart pumps the blood through short vessels, which empty into internal cavities and bathe the organs. After the blood bathes the organs and drains from these cavities, it flows into the large sternal sinus. The blood then passes through the gills, becomes oxygenated, and returns to the pericardial. The green glands, located near the base of the antennae, filter out waste as the blood circulates. Then the waste is excreted through a pore just in front of the Crayfish's mouth.
Reference:
Bob Jones University-Thomas E. Porch, and Brad R. Batdorf. Biology. Greenville, South Carolina: BJU Press, 2005.
Many things eat crayfish like sea eagles, sharks and larger fish
A yabby possesses legs which it can walk with on the floor of rivers and dams, strong claws also allow it to be quite a good climber and sometimes make it's way through strong currents. Walking and gripping though quite accurate and easy, is not a very fast way for them to move. If threatened, other than attacking with claws, a yabby may flick it's tail hard, causing it to shoot backwards through the water quite fast, an advantage for getting away, but it does make control and sensing threats more difficult, which is why it is not the usual way for it to move, even though it is much faster.
No, whelks are not crustaceans; they are a type of marine snail belonging to the class Gastropoda. Unlike crustaceans, which are part of the class Malacostraca and include animals like crabs and shrimp, whelks have a soft body and a coiled shell. They are mollusks and are known for their distinctive spiral shells and predatory behavior.
What is the advantage of the gills being attached to walking legs on crayfish?
to survive in shallow water
