Phylum Arthropoda. Similarities between Annelids and Arthropods Arthropods are metameric and their segments have appendages Nervous system with ventral nerve cords. Phylum Onychophora Annelid-like
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Peripatus, a small, nocturnal form found among the leaf-litter of tropical forests of South America.
The fossil record indicates that onychophorans have not changed much in 500 million years.
The Onychophoran Aysheaia from the Cambrian.
A lobe-limbed, segmented animal. Also note the spines on the legs. The head end has a pair of tapering limbs with spines, and three small projections near the mouth. Traces of the digestive tract can also be seen.
Phylum Tardigrada changed much in 500 million years.or “water bears” also have features in common with both annelids and arthropods
Arthropod Taxonomy: Overview changed much in 500 million years.
The arthropods evolved along four main lines, which most zoologists recognize as 4 distinct subphyla
1. Trilobita - extinct trilobites
2. Chelicerata - horseshoe crabs, spiders, ticks, mites, and some extinct groups
3. Crustacea - crabs, lobsters, shrimps, barnacles
4. Uniramia - insects, centipedes, millipedes
Orb web construction
Complete Metamorphosis (Holometabolous) changed much in 500 million years.