Overview of Class Onycophora (Peripatus) Characteristics and Traits

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Class Onycophora includes organisms like Peripatus, characterized by features such as possessing a thin cuticle, soft muscular body wall, scattered spiracles, cilia in genital organs, and wormlike body structure with unsegmented legs. They exhibit separate sexes, direct development, and possession of nephridia and gills. Their body is divided into cephalothorax and abdomen, and they have appendages modified for various functions like swimming and food capture. Onycophorans have antennae, antennules, well-developed mouthparts, and an exoskeleton, functioning mainly as land-dwelling creatures.


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  1. Class Onycophora e.g. peripatus

  2. Characteristics

  3. Thin cuticle, soft muscular body wall

  4. Longitudinal and circular muscles

  5. Spiracles scattered, irregularly over the body

  6. Cilia present in genital organs

  7. Body wormlike and externally unsegmented with imperfectly jointed legs each with 2 claws

  8. Possession of nephridia

  9. Separate sexes, direct development.

  10. Possession of gills.

  11. Queen or antennary gland for excretion

  12. Possess antennae and antennules

  13. Well developed mouthparts

  14. Appendages modified for swimming, walking and food capture

  15. Body divided into two 2 regions, cephalothorax and abdomen

  16. They possess exoskeleton

  17. possess tracheate, land living

  18. Arthropods with elongated body

  19. Possess a distinct head with a pair of antennae

  20. Excretion by malphighian tubules.

  21. Subclass Chilopoda ___ Centipedes

  22. Subclass Diplopoda ___ Millipedes

  23. Arthropods with fully chitinised exoskeleton

  24. They have two regions, proxoma and opisthosoma

  25. Well developed appendages modified for various purposes, maybe sensory, prehensile or for walking but typically four pairs of walking appendages

  26. Respiration by gill or lung books or by trachea

  27. Excretion by coxal glands or malpighian tubules

  28. Poison glands in some

  29. Sexes separate with direct development

  30. Possession of a pair of chelicerae (instead of antennae)

  31. The body is segmented

  32. The body is covered by chitinous exoskeleton

  33. Body divided into three regions, head, thorax and abdomen

  34. On the head are found the following: - a pair of antennae, a pair of mandibles and 2 pairs of maxillae, adapted for sucking, biting, piercing, and chewing.

  35. Two pairs of wing, some a pair, some none, when two pairs on mero and Meta thorax.

  36. Three pairs of walking legs

  37. Respiration is by trachea, branched spiracles

  38. They have a complete digestive system, fore, mid and hind gut.

  39. Salivary gland

  40. An open circulatory system

  41. Malphighian tubules open into the hind gut.

  42. Nervous system

  43. Possess a pair of large compound eye

  44. Separate sexes. Internal fertilization

  45. Complete or incomplete metamorphosis. When complete egg larva pupa adult. When incomplete egg nymph adult.

  46. Pathonogenous , some of them reproduce by parthenogenesis in form of sexual reproduction

  47. Insect have about 29 orders.

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