Phylum Aschelminthes
$\displaystyle \small \bullet$ They are generally called roundworms, as the body is circular in cross section.
$\displaystyle \small \bullet$ They are aquatic, free living, terrestrial or parasitic.
$\displaystyle \small \bullet$ They are bilaterally symmetrical, triploblastic and pseudocoelomate animals.
$\displaystyle \small \bullet$ They have organ level of organization.
$\displaystyle \small \bullet$ Body is externally covered with thick cuticle of scleroprotein.
$\displaystyle \small \bullet$ Alimentary canal is complete with a well-developed muscular pharynx.
$\displaystyle \small \bullet$ Respiratory and circulatory systems are absent.
$\displaystyle \small \bullet$ Excretory system includes a system of canals, protonephridia (in some) for osmoregulation.
$\displaystyle \small \bullet$ They are mostly dioecious i.e. sexes separate. Males and female are distinct. Often females are longer than males.
$\displaystyle \small \bullet$ Fertilization is internal and development may be direct or indirect.
$\displaystyle \small \bullet$ Ex:Ascaris (Roundworm), Wuchereria (Filaria worm), Anchylostoma (Hookworm).
Phylum Annelida
$\displaystyle \small \bullet$ They are mostly aquatic (marine or freshwater), some terrestrial, sedentary or free-living, some are parasitic.
$\displaystyle \small \bullet$ They are elongated, triploblastic, bilaterally symmetrical animals.
$\displaystyle \small \bullet$ They are metamerically segmented coelomate animals.
$\displaystyle \small \bullet$ They have organ grade of organization.
$\displaystyle \small \bullet$ Aquatic annelids have lateral appendages called parapodia which help in locomotion.
$\displaystyle \small \bullet$ Have closed circulatory system and complete digestive system.
$\displaystyle \small \bullet$ Nervous system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord.
$\displaystyle \small \bullet$ Excretion and osmoregulation takes place by Nephridia.
$\displaystyle \small \bullet$ Sexes are separate or unisexual. Reproduction is by sexual method.
$\displaystyle \small \bullet$ Their development is direct in monoecious form but indirect in dioecious form.
$\displaystyle \small \bullet$ Ex: Nereis, Pheretima (Earthworm), Hirudinaria (Leech)
Phylum Arthropoda
$\displaystyle \small \bullet$ This is the largest phylum of kingdom Animalia which includes insects.
$\displaystyle \small \bullet$ They are triploblastic, segmented, bilaterally symmetrical and coelomate animals.
$\displaystyle \small \bullet$ They exhibit organ system level of organization.
$\displaystyle \small \bullet$ The body is divided into head, thorax and abdomen.
$\displaystyle \small \bullet$ The body is covered by chitinous exoskeleton.
$\displaystyle \small \bullet$ Their body has jointed appendages (hence the name Arthropoda) which help in locomotion
$\displaystyle \small \bullet$ Respiratory system has organs like gills, book gills, book lungs or tracheal system.
$\displaystyle \small \bullet$ Open circulatory system is present and coelomic cavity is filled with blood.
$\displaystyle \small \bullet$ They have sensory organs like antennae, compound eyes, statocysts or balance organs.
$\displaystyle \small \bullet$ Excretion takes place through Malpighian tubules (terrestrial arthropods) and green glands (aquatic arthropods).
$\displaystyle \small \bullet$ Sexes are separate, fertilization is internal and development may be direct or indirect.
$\displaystyle \small \bullet$ Most of the arthropods or oviparous.
$\displaystyle \small \bullet$ Ex: Apis (Honey bee), Bombyx (Silkworm), Anopheles (mosquito).
$\displaystyle \small \bullet$ They are generally called roundworms, as the body is circular in cross section.
$\displaystyle \small \bullet$ They are aquatic, free living, terrestrial or parasitic.
$\displaystyle \small \bullet$ They are bilaterally symmetrical, triploblastic and pseudocoelomate animals.
$\displaystyle \small \bullet$ They have organ level of organization.
$\displaystyle \small \bullet$ Body is externally covered with thick cuticle of scleroprotein.
$\displaystyle \small \bullet$ Alimentary canal is complete with a well-developed muscular pharynx.
$\displaystyle \small \bullet$ Respiratory and circulatory systems are absent.
$\displaystyle \small \bullet$ Excretory system includes a system of canals, protonephridia (in some) for osmoregulation.
$\displaystyle \small \bullet$ They are mostly dioecious i.e. sexes separate. Males and female are distinct. Often females are longer than males.
$\displaystyle \small \bullet$ Fertilization is internal and development may be direct or indirect.
$\displaystyle \small \bullet$ Ex:Ascaris (Roundworm), Wuchereria (Filaria worm), Anchylostoma (Hookworm).
Phylum Annelida
$\displaystyle \small \bullet$ They are mostly aquatic (marine or freshwater), some terrestrial, sedentary or free-living, some are parasitic.
$\displaystyle \small \bullet$ They are elongated, triploblastic, bilaterally symmetrical animals.
$\displaystyle \small \bullet$ They are metamerically segmented coelomate animals.
$\displaystyle \small \bullet$ They have organ grade of organization.
$\displaystyle \small \bullet$ Aquatic annelids have lateral appendages called parapodia which help in locomotion.
$\displaystyle \small \bullet$ Have closed circulatory system and complete digestive system.
$\displaystyle \small \bullet$ Nervous system consists of paired ganglia connected by lateral nerves to a double ventral nerve cord.
$\displaystyle \small \bullet$ Excretion and osmoregulation takes place by Nephridia.
$\displaystyle \small \bullet$ Sexes are separate or unisexual. Reproduction is by sexual method.
$\displaystyle \small \bullet$ Their development is direct in monoecious form but indirect in dioecious form.
$\displaystyle \small \bullet$ Ex: Nereis, Pheretima (Earthworm), Hirudinaria (Leech)
$\displaystyle \small \bullet$ This is the largest phylum of kingdom Animalia which includes insects.
$\displaystyle \small \bullet$ They are triploblastic, segmented, bilaterally symmetrical and coelomate animals.
$\displaystyle \small \bullet$ They exhibit organ system level of organization.
$\displaystyle \small \bullet$ The body is divided into head, thorax and abdomen.
$\displaystyle \small \bullet$ The body is covered by chitinous exoskeleton.
$\displaystyle \small \bullet$ Their body has jointed appendages (hence the name Arthropoda) which help in locomotion
$\displaystyle \small \bullet$ Respiratory system has organs like gills, book gills, book lungs or tracheal system.
$\displaystyle \small \bullet$ Open circulatory system is present and coelomic cavity is filled with blood.
$\displaystyle \small \bullet$ They have sensory organs like antennae, compound eyes, statocysts or balance organs.
$\displaystyle \small \bullet$ Excretion takes place through Malpighian tubules (terrestrial arthropods) and green glands (aquatic arthropods).
$\displaystyle \small \bullet$ Sexes are separate, fertilization is internal and development may be direct or indirect.
$\displaystyle \small \bullet$ Most of the arthropods or oviparous.
$\displaystyle \small \bullet$ Ex: Apis (Honey bee), Bombyx (Silkworm), Anopheles (mosquito).
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