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Arthropod
Any member of the largest phylum, Arthropoda, in the animal kingdom. Arthropoda consists of more than one million known invertebrate species in four subphyla: Uniramia (five classes, including insects), Chelicerata (three classes, including arachnids and horseshoe crabs), Crustacea (crustaceans), and Trilobita (trilobites). All arthropods are bilaterally symmetrical and possess a segmented body covered by an exoskeleton containing chitin, which serves as both armour and a surface for muscle attachment. Each body segment may bear a pair of jointed appendages. The phylum includes carnivores, herbivores, omnivores, detritus feeders, filter feeders, and parasites (see parasitism) in nearly all environments, both aquatic and terrestrial.
Spider
Any of numerous arachnids of the order Araneae, having a body divided into a cephalothorax bearing eight legs, two poison fangs, and two feelers and an unsegmented abdomen bearing several spinnerets that produce the silk used to make nests, cocoons, or webs for trapping insects.
Arachnids- A body with two segments, eight legs, spinnerets, no chewing parts, no wings, and the presence of chelicerae, which Spiders use to hold prey, and in most cases, inject venom.
Crustaceans- Crustacean anatomy is characterized by an external skeleton and a segmented body. Composed of a series of hard segments called somites. They have two sets of jaws in front of the mouth, and have several appendages near the mouth that act as feeding aids. The limbs usually start with a pair of developed arms with claws. Behind these are 4 pairs of walking legs, and as the claws are classed as legs. They have a total 10 LEGS.
Annelid animals Arthropods
1
Have true body cavity (coelomic cavity) not
filled with blood.
1 The coelomic cavity is blood filled.
2
They have lateral appendages for
locomotion in the form of chitineous setae
or parapodia.
2 They have jointed legs for locomotion.
3
Annelids like earthworm and leech do not
have chitinous exoskeleton.
3 They have chitinous exoskeleton.
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From what animal group did arthropods evolve?
It is not likely that the annelids evolved from the arthropods is as much as they are the much simpler of the two groups of organisms. The arthropods have a well developed open circulatory system, segmented muscles and a complex nervous system (including eyes and chemoreceptors, the antennae) and an exoskeleton.
Are arthropods parasites?
No. Leeches are annelids, also known as segmented worms.
What evedince suggest that arthropods might have envovled from annenlids?
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!
Are sanddollars arthropods?
no, i dont know what they are, but they are not arthropods
Are earthworms insects?
No they are not. They do not have 6 legs. They are part of a phylum called Annelida. In that phylum they are in a class called Clitellata. In contrast, insects are part or the phylum Arthropoda and the class Insecta,
What is the evolutionary relationship of arthropods and annelids?
Arthropods have shells designed for protection while annelids do not.
What do annelids and arthropods have?
Segmented Bodies
Are scorpions annelids flatworms mollusks arthropods cnidarians or echinoderm?
a scorpion is a Arthropods
Which groups of invertebrates are protostomes?
Flatworms, Roundworms, Annelids, Mollusks, and Arthropods
Name 3 invertebrate groups?
3 of the water invertebrate groups are the annelids, arthropods and crustacean.
What evidence suggests that Arthropoda might evolved from Annelids?
Annelids include earthworm,leeches and nereis;arthropods include mainly insects.THe relations between them is that both are triploblastic,coelomates,segmented body,bilateral symmetry and oviparous type of reproduction.
Is a millipede is a worm?
No. Millipedes are myriapods, meaning "many feet". Centipedes are also myriapods. Segmented worms are annelids; earthworms and leaches belong to this group. Also, myriapods are arthropods; annelids are not.
Which type of animals are believed to have involved from segmented worms?
The arthropods (for instance, centipedes) are believed to have descended from the annelids (segmented worms).
What are the invertebrate groups?
The eight groups are:* Mollusks * Echinoderms * Arthropods * Annelids * Nematodes * Porifera* Platyhelminthes * Coelenterates Or go to:What_are_the_8_groups_of_invertebrates
What is the difference between monecious and dioecious in mollusks and annelids?
monecious is when it has male and female reproductive organs in the same organism.
What are two organisms that have segmented body plans?
The types of organisms which have segmented bodies include annelids, arthropods, echinoderms, and chordates. Some of the most obvious examples of segmentation are found in insects which belong to the arthropods.
What are the characteristics of 8 groups of invertebrates?
the 8 groups of invertebrates are the arthropods, poriferans, platyheminthes, coelenterates, nematoeds, mollusks, echinoderms, and annelids
