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1. Bilateral symmetry, triploblastic animals with organ level organization, coelomate animals
2. The body of the organisms are metamerically segmented in to distinctly marked rings, hence the name of the phylum Annelida (Latin: Annulus – ring)
3. Presence of longitudinal and circular muscles for locomotion activity
4. Presence of lateral appendages called parapodia which help in swimming activity. Seen in aquatic animals likeNereis
5. Presence of closed circulatory system
6. Specialised cells called as Nephridia (singular – nephridium) carry out fnctions like osmoregulation and excretion
7. Nervous system comprises paired ganglia connected by lateral nerves to a double ventral cord.
8. Sexes are either monoecious in the case of animals like earthworms and leeches or dioecious in the case of aquatic animals like Nereis.
9. Organisms belonging to the phylum Annelida – Pheretima (Earthworm), Nereis, Hirudinaria (Blood sucking leech)
A. Nereis B. Hirudinaria
1. Largest phylum of the Animal kingdom comprising insects.
2. Mostly terrestrial, bilaterally symmetrical, triploblastic with organ level organization, segmented and coelomate animals.
3. Body of anthropods is covered by chitinous exoskeleton consisting of head, thorax and abdomen region connected by jointed appendages, hence the name anthropod (Anthros – joint, poda – appendages)
4. Presence of open circulatory system. Respiratory system may be gills, book gills, book lungs or tracheal system
5. Presence of sensory organs like antennae, compound or simple eyes, stastocysts or balance organs
6. Malphigian tubules are present for carrying out excretory wastes
7. Organisms are dioecious. Fertilization is internal and development may be direct or indirect.
8. Mostly oviparous animals
9. Organisms belonging to phylum anthropoda – Apis (Honey bees), Laccifer (Lac insect), vectors like Anopheles(Mosquitoes), pests like Locusta (Locust) and living fossils like Limulus (King crab)
A. Locust B. Butterfly
C. Scorpion D. Prawn