PPT Slide

Similarities between Annelids and Arthropods

• Arthropods are metameric and their segments have appendages

• Nervous system with ventral nerve cords

Phylum Onychophora

Annelid-like

• Segmented; unjointed appendages; similarity in structure of the body wall; segmentally arranged nephridia; pigment-cup ocelli

Arthropod-like

• Reduced coelom, open circulatory system, tracheal system; soft cuticle composed of chitin

Peripatus, a small, nocturnal form found among the leaf-litter of tropical forests of South America.

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