Organisms which exhibiting characters of two adjacent taxonomic groups are called connecting links.
| Group |
Connective Link |
| Living and non-living |
Virus |
| Virus and Bacteria |
Rickettsia |
| Protozoa and metazoa |
Xenoturbella and Nematoderma (flatworm) |
| Bacteria and Fungi |
Actinomycetes |
| Protista and Fungi |
Myxomycetes |
| Protista and Bryophytes |
Hornworts Protista and Bryophytes |
| Bryophytes and Pteridophytes |
Club moss |
| Pteridophytes and Gymnosperms |
Cycas |
| Gymnosperms and Angiosperms |
Gnetum(gymnosperm) |
| Aquatic and land plants |
Fritschiella |
| Animals and Plants |
Euglena(protozoan) |
| Protozoa and Porifera |
Proterospongia(protozoan) |
| Coelenterates and Platyhelminthes |
Ctenophora |
| Annelida and Arthropoda |
Peripatus (walking worm) |
| Annelida and Mollusca |
Neopilina(Mollusca) |
| Annelida and Mollusca |
Trochophore larva |
| Echinodermata and Chordata |
Tornaria larva |
| Chordates and Non-chordates |
Balanoglossus (hemichordate) |
| Cartilaginous and Bony fishes |
Chimaera (Rabbit fish/Ratfish) |
| Pisces(fish) and Amphibia(tetrapods) |
Latimeria |
| Bony fishes and Amphibia |
Protopterus (Lung fishes) |
| Amphibia and Reptilia |
Sphenodon (Living fossil lizard) |
| Amphibia and Reptiles |
Seymouria(reptile) |
| Reptiles and Birds |
Archaeopteryx(bird) |
| Reptiles and Mammals |
Echidna (Spiny ant eater) |
| Reptiles and Mammals |
Ornithorhynchus (Duck billed platypus) |
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