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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