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Connecting link, Missing link and Living fossils animals / Agrivetforestry

CONNECTING LINK, MISSING LINK AND LIVING FOSSIL ANIMALS

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What are connecting links?

Connecting links are those living organisms which possess the characteristics of two different groups of plants or animals. These organism are found in nature easily in the present time. eg. euglena, virus, Balanoglossus etc.

What are missing links?

Those linking organism which does not exist at present time but are found as fossils are called as Missing links. They are also called as fossils connecting links. These organism cannot be found in the nature in the present time. Palaeontology(study of fossils) suggested that these organism were exist in nature and were believed to be the bridge between two groups of organisms in the past time. eg. archaeopteryx, seymouria etc.

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Both of the connecting links and missing links function as same to represent the link between two groups either of them exist or not. Here are some examples of them.

1) Virus = Living and Non-living
2) Rickettsia = Virus and Bacteria
3) Actinomycetes = Bacteria and Fungi
4) Myxomycetes = Protista and Fungi
5) Hornworts = Protista and Bryophytes
6) Club moss = Bryophytes and Pteridophytes
7) Cycas = Pteridophytes and Gymnosperms
8) Gnetum = Gymnosperms and Angiosperms
9) Euglena = Plants and Animals
10) Proterospongia = Protozoa and Sponge
11) Xenoturbella = Protozoa and Metazoa
12) Ctenophora = Coelenterates and Platyhelminthes
13) Peripatus (walking worm) = Annelida and Arthropoda
14) Neopilina = Annelida and Mollusca
15) Tornaria larva = Echinodermata and Chordata
16) Balanoglossus = Chordates and Non-chordates
17) Chimaera (Rabbit fish / Ratfish) = Cartilaginous and Bony fishes 
18) Protopterus (Lung fishes) = Fishes and Amphibia
19) Seymouria (missing link ) = Amphibia and Reptiles
20) Sphenodon (Living fossil lizard) = Amphibia and Reptilia
21) Archaeopteryx (missing link ) = Reptiles and Birds
22) Echidna (Spiny ant eater) = Reptiles and Mammals
23) Ornithorhynchus (Duck billed platypus) = Reptiles and Mammals

What are living fossils?

Living fossils are the animals which underwent no or very few change during long geological period. These animals remained in the same condition for long time even other animals went many evolutionary changes. Some of the important living fossils are:-

1) Paripatus (Arthropoda)
2) Limulus (Arthropoda)
3) Neopilina (Mollusca)
4) Nautilus (Mollusca)
5) Latimeria (Coelacanth fish)
6) Lingula (Brachiopoda)
7) Sphenodon (Reptilia)
8) Didelphis (Opossum)


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6 Comments

  1. Replies
    1. It might held on mid week or last week of falgun.

      Delete
  2. Elemental difference between tu and afu

    ReplyDelete
    Replies
    1. TU and AFU are two different universities in nepal.

      AFU is Nepal's 1st technical university in which only 4 courses are taught. They are agriculture(FOA), veterinary & fisheries(FAVF) and forestry(FOF).

      Under TU many technical and non-technical courses are taught. Under ag. vet. and forestry field, two faculties are there. They are IAAS (Institute of agriculture and animal science) and IOF(Institute of Forestry).

      You can get alot of scholarship seats on both university. click here to view scholarship seats.

      For more info;
      Contact us +9779865501902
      or agrivetforestry@gmail.com

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