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 fish...