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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