Which Of The Following Is A Segmented Animal With An Exoskeleton And Jointed Appendages

Arthropods Definition

An "arthropod" is an invertebrate animal that has an exoskeleton, a segmented torso, and jointed appendages. The following families of organisms are all examples of arthropods:

Insects such as ants, dragonflies, and bees
Arachnids such as spiders and scorpions
Myriapods (a term which means "many feet") such as centipedes and milipedes
Crustaceans such every bit crabs, lobsters, and shrimp

It may help to recollect that the term "arthropod" comes from the Greek words for "jointed foot." If the organism has an exoskeleton with joints between its feet and its body, information technology is probably an arthropod!

Arthropods are a lineage of life that adult skeletons on the outside – their hard shells, fabricated of a material called "chitin" – instead of on the inside for structural support.

Arthropods' bodies also have other of import differences from those of vertebrates like ourselves – their organ systems are simpler and less efficient, which limits the size arthropods can accomplish.

An emmet the size of a human being, for instance, would non be able to pump oxygen through its blood to feed all its tissues, since the arthropod circulatory arrangement is simpler and less efficient than a humans'.

All arthropods are thought to have evolved from a single common ancestor, though scientists are not sure what this common ancestor looked like, or exactly when it lived.

Arthropod Characteristics

Characteristics shared by all arthropods include:

Exoskeletons made of chitin
Highly developed sense organs
Jointed limbs (the limbs must exist jointed like the joints in a suit of armor, since the exoskeleton is rigid and cannot bend to let movement)
Segmented bodies
Ventral nervous system. "Ventral" ways "in forepart," and so this ways that arthropods' nervous systems run along the front of their bodies, about their stomachs, instead of forth their backs like the spinal cords of animals.
Bilateral symmetry. This ways that the left and right sides of an arthropod are the same – it volition take the same number and arrangement of legs, eyes, etc. on the right side of its trunk as on the left.

Types of Arthropods

Trilobites

Trilobites were an ancient family of marine arthropods that went extinct during the Permian-Triassic extinction upshot. Today, they are known to us mostly through fossils similar the one beneath.

They lived on the ocean flooring and occupied ecological niches similar to those occupied by crustaceans today.

Chelicerates

Chelicerata are a branch of the arthropod family tree that, at beginning glance, may not appear related to each other.

This family unit includes arachnids (such as spiders and scorpions), body of water spiders (which wait similar to arachnids but have some important differences), and horseshoe venereal (which, despite their name, have important differences from other crustaceans).

Myriapods

The term "myriapod" means "many legs" – so information technology is non surprising that centipedes, milipedes, and other many-legged creatures are office of this family.

Myriapods can accept anywhere from less than ten legs – to over 750! That simply seems excessive.

Myriapods are typically found in forests and other ecosystems where there is lots of decomposable found and animate being material for them to feed on.

Crustaceans

Crustaceans are a family of primarily aquatic arthropods that include lobsters, venereal, shrimp, crayfish, barnacles, and the odd one out – forest lice, also known as pill bugs or "roly polys."

Unlike their aquatic cousins, wood lice live mostly on dry state and are found in environments such as gardens and forests, where they survive by eating decaying plant and brute fabric.

It may also surprise yous to see barnacles included on this list: adult barnacles develop hard shells that stick them to their surroundings, such every bit the bottoms of boats or other underwater surfaces.

But earlier in their lives before they freeze in place, barnacles have bodies with legs much like the other crustaceans!

Hexapods

The term "hexapod" literally means "six feet." It might not surprise you to learn that insects – which all have six legs – are hexapods.

Insects include most "bugs" with six legs, such as flies, ants, termites, beetles, dragonflies, mosquitoes, cockroaches, collywobbles, and moths.

In that location are also three much smaller groups of animals in the "hexapod" category. Collembola, Protura, and Diplura were all once considered to be insects, only later establish to accept small differences that set them apart from other insects.

Examples of Arthropods

Ants

When you call back of a stereotypical arthropod trunk, you probably retrieve of an ant. Ants take hard exoskeletons and jointed legs. They also accept bodies which are clearly segmented into a head, thorax, and abdomen.

Ants prove ane type of social organisation that has been developed by arthropods. Ants, bees, and termites are all what is chosen "eusocial" organisms – organisms living in extreme degree of cooperation, with "colonies" that most operate similar a single organism themselves.

Most arthropod species are not eusocial, but eusocial colony life is ane of the fascinating roads that arthropod development has taken.

Spiders

Spiders are as well arthropods, possessed of hard exoskeletons, segmented bodies, and jointed limbs.

Spiders typically consume smaller arthropods, such as gnats and flies – though they will eat any living matter they can catch, and some particularly huge spiders take been known to swallow birds or rodents!

Spiders take evolved a multifariousness of strategies for catching their prey – some spin viscid, nigh invisible webs that prey animals wander into and get stuck. Others are agile hunters, including jumping spiders which can jump at extreme speeds using special mechanisms in their legs.

Some spiders combine these ii strategies, such as "trap door" spiders, which ready traps past creating hiding places for themselves – and so jumping out to grab unsuspecting prey animals that wander by!

Lobsters

With lobster being considered a luxury food today, it's like shooting fish in a barrel to forget that lobsters are in the same family as spiders and ants.

Crustaceans can abound bigger underwater than on land – and lobsters tin can grow to weigh virtually fifty pounds!

Lobsters' body design has inverse little in the last 100 million years, and their anatomy is spectacularly weird. The lobster'south kidneys are located in its head, its encephalon in its pharynx, and its teeth in its tummy. Its "ears" for picking up sound are located in its legs, and its tastebuds, similar those of insects, are in its feet.

Collywobbles

Butterflies are the most famous example of arthropod metamorphosis.

At some signal in their lifecycle, all arthropods go through a drastic modify from their larval stage to their adult class. But collywobbles are the only ones whose adult forms are so beautiful that nosotros pay attention to this change.

The mutual features of exoskeleton, jointed limbs, and segmented trunk can exist seen in developed butterflies.

Facts About Arthropods

Arthropods colonized land almost 100 million years before vertebrates did. It's thought that colonizing land was easier for them for several reasons – including the fact that they had already evolved legs, which they used for walking on the lesser of the ocean.
About 80% of all animate being species are arthropods! We don't see them very oft in our daily lives, but all the species of bugs and crustaceans on Earth add upwards!
All arthropods undergo metamorphosis – a process where their bodies change radically every bit they laissez passer from their larval to adult stages. Butterflies are the best-known for entering cocoons as caterpillars and coming out quite unlike, but all arthropods practice something similar!
When arthropods outgrow their one-time exoskeleton, they have to molt – leaving behind their one-time skin and growing a new one. All arthropods have to practice this at least one time in their lives.
Crustaceans and arachnids – two types of arthropods – take blue blood instead of ruby-red blood!This is considering their blood uses a blue copper compound to conduct oxygen, instead of the red fe chemical compound used past animals.
Arthropods' difficult exoskeletons is made of chitin – which is made of a derivative of the sugar glucose! But chitin would not taste sugariness, and y'all wouldn't exist able to swallow information technology; to make information technology difficult and strong, the glucose is modified and then that our bodies no longer recognize it every bit sugar.

Common ancestor – A mutual ancestor is an individual or species from which multiple individuals or species evolved.
Evolution – The process by which populations change over fourth dimension, due to random mutation and the pressures of natural selection.
Extinction – The procedure by which a species ceases to be after the death of its last member. About species that have lived on World to engagement are now extinct.

Quiz

one. Which of the following is Non true of arthropods?
A. They have exoskeletons fabricated of chitin.
B. They are symmetrical, having the aforementioned features on 1 side of their torso as the other.
C. They colonized state long before vertebrate animals did.
D. None of the to a higher place.

Answer to Question #i

D is right. All of the above are true of arthropods!

ii. Which of the following is NOT a type of arthropod?
A. Hexapods
B. Crustaceans
C. Cephalopods
D. Myriapods

Reply to Question #2

C is correct. The term "cephalopod" has the Greek word "pod" for "pes" in it – but that doesn't hateful they're an arthropod! Cephalopods are the family unit of squids, octopuses, and other creatures that decidedly practise non have exoskeletons, jointed limbs, or segmented bodies.

iii. Which of the post-obit is Non an arthropod?
A. A scorpion
B. A snail
C. A dust mite
D. A crab

Respond to Question #3

B is correct. A snail is not an arthropod. Although information technology has a beat out which could exist argued to be a sort of exoskeleton, its beat out is non jointed. The snail lacks a true exoskeleton, jointed limbs or a segmented body. The other organisms on this listing have all of those things.

Source: https://biologydictionary.net/arthropod/

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