Arthropods

Yes, having an exoskeleton is a defining characteristic of arthropods. Animals with internal skeletons belong to three other phyla, for example Chordata - the chordates, including mammals, reptiles, amphibians, etc.

Phylum Arthropoda hosts at least eighteen classes, (not counting those yet to be fully classified):

Trilobita - trilobites (extinct)

Arachnida - spiders, scorpions, etc.

Merostomata - horseshoe crabs, eurypterids (extinct), etc.

Pycnogonida - sea spiders

Chilopoda - centipedes

Diplopoda - millipedes

Pauropoda - sister group to millipedes

Symphyla - resemble centipedes

Branchiopoda - brine shrimp etc.

Remipedia - blind crustaceans

Cephalocarida - horseshoe shrimp

Maxillopoda - barnacles, copepods, fish lice, etc.

Ostracoda - seed shrimp

Malacostraca - lobsters, crabs, shrimp, etc.

Insecta - insects

Entognatha - wingless

Camptophyllia (extinct)

Marrellomorpha (with one extinct species)

The crustaceans are arthropods with biramous (branching) appendages, including a larger and smaller pair of antennae, the smaller ones being referred to as antennules.

Because of a process called Ecdysis (also known as moulting) arthropods are able to grow bigger. In ecdysis old exoskeleton is shed and new one (slightly bigger) covers the body.

No. Leeches are annelids, also known as segmented worms.

all arthropods are not insects because.. Arthropods aka the Phyla Arthropoda consists of 4 classes. (yr 1 university level here :D ) they are the Crustacea arachnida myriapoda and as you said the insecta. ok so these CLASSES are well defined by the characteristics the organisms of the class bear in common. hence one should not confuse the insect class with the phyla arthropods because one is a main category whilst one is a sub category which aid in defining the main category as a whole. hope this was helpful.

The body of arthropods is physically supported by an external skeleton (exoskeleton) made of a tough protein called chitin. Because it is inflexible, arthropods need to shed it entirely in order to grow in size.

external sexual

Phylum: Arthropods

Subphylum: Hexapods

Class: Insecta

Family: Bombycidea

Genus: Bombyx

Specie: Bombyx Mori

Radwan Dabaja.

Arthropods are only one group of invertebrate animals. There are many other invertebrates in the world. Some examples would include single-celled animals, worms, jellyfish, gastropods like slugs and snails, and echinoderms like starfish and sand dollars. Most animals in the world are, however, in the arthropod category. WikiAnswers

All legged arthropods have joints. Since arthropods have rigid exoskeletons, some degree of articulation or jointing would be essential else locomotion would be impossible. To provide the degrees of freedom necessary for effective locomotion, multiple joints per leg are necessary. The strategy varies somewhat from species to species in terms of the type and number of joints and length of each segment depending on the degrees of freedom required for each particular organism.

Phylum Arthropoda is the most diverse and abundant phylum of animals, estimates range from 2 to 10 million species fall into Arthropada.

All arthropods have an exoskeleton made of chitin (pronounced kite-en) which are strong fibers of long nitrogen-containing sugars. Additionally arthropods are the first animals to evolve jointed appendages, hence their name (arthro = jointed, poda = foot or appendage). Arthropods are coelomate, meaning they have an open circulatory system, but their organ systems are well developed.

Examples of arthropods range from lobster, crabs, shrimps, and crayfish, to insects, arachnids (spiders, scorpions, mites, and ticks), millipedes, and centipedes.

Yes. The most sophisticated example is the bee dance, with which bees tell eachother where food is to be found, how far away and in which direction. Arthropods also communicate a lot by pheromones, mainly to let partners know where they are and when they're fertile. Moth males can smell females miles away, but some spiders play into this by mimicking the female's scent! This, too, is communication... And of course, ants recognize members from their own colony by stroking antennae together, and they're not unique in this.

Spinosaurus

EDIT - Either Basilosaurus or Liopleurodon.

That's incorrect. Largest was megadolon. It was 16-20 meters and more then 50 tons. For me that's absolutly largest carnivore ever.

Members of class Chelicerata, order Arachnida and suborder Aranaea, being regular Spiders. The cephalothorax bears the eyes, mouth, legs and musculature used to move these, and the abdomen contains the vital organs.

no a starfish isn't an arthropod

Under arthropoda are Subphyla Chelicerata, Myriapoda, Crustacea, and Hexapoda. (There is also an extinct class Marrellomorpha and an the extinct Trilobite subphylum). The chelicerata, like spiders, scorpions, mites, etc., get their name from having appendages appear before the mouth; myriapods like centipedes and millipedes characterized by a high count of body segments and legs; crustaceans like crabs, shrimp, woodlice characterized by their biramous (two-part) limbs and a specialized larval form; hexapoda named for their consolidated thorax with only three pairs of legs.

There are many classes below these subphyla.. here is a list:

Trilobita - trilobites (extinct)

Arachnida - spiders, scorpions, etc.

Merostomata - horseshoe crabs, eurypterids (extinct), etc.

Pycnogonida - sea spiders

Chilopoda - centipedes

Diplopoda - millipedes

Pauropoda - sister group to millipedes

Symphyla - resemble centipedes

Branchiopoda - brine shrimp etc.

Remipedia - blind crustaceans

Cephalocarida - horseshoe shrimp

Maxillopoda - barnacles, copepods, fish lice, etc.

Ostracoda - seed shrimp

Malacostraca - lobsters, crabs, shrimp, etc.

Insecta - insects

Entognatha - wingless

Camptophyllia (extinct class)

Marrellomorpha (one extinct species)

Some classes are still uncertain and debate is ongoing as to placement in the taxonomic tree.

Millipedes are not known to live underwater. The natural habitat for a millipede is in gardens, greenhouses, forest, or any other place where dead plant matter is available to eat.

Arthropods, i think are usually scavengers and they feed on the dead. Arachnids (Insects) either eat other insects, much smaller to them or they eat dead stuff. Marine arthropods feed on the dead too...!

Annelids are segmented in much the same way as arthropods (think of earthworms). Primitive arthropods include centi- and millipedes, with many unspecialized legs (legs in more advanced arthropods often specialized to form antennae, mandibles and pedipalps), and they're as long and thin as segmented worms. Also, there's a possible 'intermediate form', Peripatus, the velvet worm, being long, thin and soft-skinned, but also having many stubby legs!

Because when an arthropod sheds its skin, its new skin underneath is very soft, so the animal can grow once it's free of its hard armour. They're easy squishy prey during this period. They're only safe once the new skin hardens again.

Oh, not to mention the process itself often renders them immobile. Some (spiders etc) have to lie on their backs for hours while taking off their 'panties'.

Aquatic arthropods mostly exchange gases through (c) gills; some (like the horseshoe crabs) have book gills. The "book lungs" term usually applies to most arachnids like scorpions and spiders, which are terrestrial; most other terrestrial arthropods exchange gases through special holes in their segments called spiracles, attached to the tracheal tubules/tracheola which connect directly to the tissues.

Animals classified as arthropods would include the scorpion, the woodlouse, the coconut crab, the mosquito, the water-flea, krill, the botfly, the giant weta, and the Japanese spider-crab.