Annelida vs. Arthropoda

Main Difference

The main difference between Annelida and arthropoda is that Annelida is a group usually refer as segmentation worms, and they are present worldwide from the most buried marine deposits to yards whereas arthropoda is an invertebrate animal contains an exoskeleton, a segmenting body, and pair jointed appendages.

Difference Between Annelida and Arthropoda

Comparison Chart

Annelida vs. Arthropoda

Annelida contains no clear heads and body is externally dividing into ring-like metameres, but arthropoda body is dividing into the head, thorax, and abdomen. Exoskeletons are absent in Annelida whereas arthropoda body is cover by chitinous exoskeletons. Annelida contains no connecting appendages, but arthropoda contain jointed appendages. Excretion happens through nephridia in Annelida while in arthropoda excretion happens through a coxal gland on malpighian tubules. Respiration occurs through skin or parapodia in Annelida conversely respiration occurs through tracheae or book lungs in arthropoda. The respiratory gas exchange occurs in Annelida through the skin or parapodia conversely the respiratory gas exchange happens in arthropoda through gills, trachea or book lungs. Annelida comprises of palps, eyes, antennae, lateral organs, statocysts, and nuchal organs while arthropoda comprises of statocysts, antennae, dull eyes, and compound eyes. Annelida consists of a full segmentation body, which is known as the metameric segmentation on the other hand arthropoda does not consist of a fully-segmentation body.

What is Annelida?

Annelida denotes a phylum of kingdom Animalia, comprising of segmenting worms with extending body forms. About 9000 species of annelids are now identifying. Most annelids are terrestrial, and some are aquatic. Annelids are free-living animals with two-sided symmetry. Annelids are triploblastic coelomates that contain a true coelom. The coelom is dividing by interior septa. Annelids provide a fully-segmenting body known as metameric segmentation. The tissues of the body make organs. The three distinct sections of the body of an annelid are prostomium, a trunk, and a pygidium. The respiration generally occurs through the body surface. Annelida consists of a complete digestive system with a mouth and anus. Annelids comprise of a closed circulatory system with several hearts and blood vessels. The nervous system encloses an anterior nerve ring with ganglia and a ventral nerve cord. The excretion arises through nephridia. Annelids can either hermaphroditic or gonochoristic. Both internal and external fertilization can occur in annelids. The larval stages of annelids occur in zooplankton. The three classes of annelids are Oligochaeta, Polychaeta, and Hirudinea. The Polychaeta comprises of marine spine worms. The Oligochaeta contains aquatic or terrestrial earthworms. The Hirudinea consists of leeches.

What is Arthropoda?

Arthropoda denotes a phylum of kingdom Animalia, comprising of animals with jointing appendages and a chitinous exoskeleton. Arthropods may include terrestrial, aquatic, or aerial animal forms. Arthropods are triploblastic animals, whose body cavity fills with hemolymph or blood. Arthropods are haemo coelomates. The body of the Arthropoda is segmenting to head, thorax, and abdomen. The circulatory system of arthropods is an open circulatory system, comprising of a heart and an artery. Arthropoda is the first group of animals to develop a head. The head constitutes pairs of antennae and compound eyes. The jointing appendages can occur in pairs. The body of arthropods is cover with a chitinous exoskeleton; they shed their exoskeleton intermittently to complete body growth. This process is known as molting or ecdysis. The mouth is modifying to chewing or biting. Arthropods comprise of a comprehensive digestive system with anus and mouth. The respiration of arthropods occurs through the trachea, gills, or book lungs. The arthropods are unisexual animals. The excretion of terrestrial arthropods can occur through Malpighian tubules. In aquatic arthropods, the discharge occurs through coxal glands or green glands. The five classes of arthropods are Crustacea (shrimp, crayfish, and lobster), Arachnida (ticks, spiders, mites, and scorpions), Diplopoda (millipedes), Chilopoda (centipedes), and Insecta (bees, roaches, butterflies, and beetles).

Conclusion

Above this discussion, it concludes that Annelida and Arthropoda are two phyla of the kingdom Animalia, containing invertebrates. Annelida comprises of a hydrostatic skeleton whereas Arthropoda comprises of an exoskeleton made up of chitin.