Onychophora
Related Category: Zoology: Invertebrates
(n´´kf´r), small phylum with about 70 species of animals that are often called "missing links" between annelids (phylum Annelida) and arthropods (phylum Arthropoda).
=Onychophora (Peripatus, eec.). Grade 2 (of the Arthropoda). - Dignatha, Monoprosthomera. The third somite as well as the second develops a pair of parapodial jaws; the first somite is a prosthomere carrying jointed antennae.
= Diplopoda.
All these organisms have a body divided into repeating segments, typically with paired appendages. Two smaller phyla, the Onychophora and Tardigrada, are close relatives of the arthropods and share these traits.
Onychophora (velvet worms)
Orthonectida (orthonectids)
Phoronida (phoronids)
Placozoa
Platyhelminthes (flatworms)
Porifera (sponges)
Priapula (priapulans)
Rhombozoa (rhombozoans)
Rotifera (rotifers)
Sipuncula (sipunculan worms) ...
Evidence from 12S ribosomal RNA sequences that onychophorans are modified arthropods
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Evolution and natural selection - Stage 5
Evolution and natural selection - Stage 5 - Student Activities ...
 See also: Genet, Coral, Arthropoda, Annelida, Earthworm
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