Wildlife Type

Primitive Mollusc (Phylogenetic tree) - Animals in the Habitats, and Biodiversity

Classified animal picture guide. Clicking the Organism name shows the images, and pointing the Organism name shows the tooltip with three links at the left-top corner.
The followings are extinct primitive molluscs excavated and extant primitive molluscs in the world. The explanation in brackets is the ages they lived in extinct species. Note that Mya is million years ago. For example, "48.6～40.4 Mya" shows a range between 48.6 and 40.4 million years ago. The time range is shown in the Geological Time Table. The followings are a part of the Evolutionary Tree.
  • Kingdom Animalia
    • Phylum Mollusca
      Primitive mollusc Kimberella   (1000～542 Mya), Halkieria   (542～513 Mya), Hyolithes   (530～253.8 Mya), Odontogriphus (513～501 Mya)
      • Class Hyolitha
        Primitive shell Hyoliths   (530～253.8 Mya), Haplophrentis   (530～501 Mya)
      • Class Polyplacophora (Chitons)
        Primitive shell Matthevia (501～479 Mya), Chelodes   (501～412.3 Mya)
      • Class Monoplacophora (Limpet-like organisms)
        Primitive shell Scenella (542～449 Mya), Archinacella (501～445.6 Mya)
      • Class Gastropoda (Abalone, Limpets, Conch, Nudibranchs)
        • Subclass Archaeobranchia
          Primitive shell Latouchella   (542～479 Mya), Pelagiella (542～479 Mya), Yochelcionella   (530～501 Mya)
        • Subclass Eogastropoda
          Primitive shell Maclurites   (488.3～203.6 Ma; Great Dying③), Euomphalopsis (478.6～466 Mya), Euomphalus   (478.6～199.6 Ma; Great Dying③), Platyceras   (460.9～260.5 Mya)
        • Subclass Orthogastropoda
          Primitive shell Murchisonia   (472～130 Ma; Great Dying③④), Loxonema   (460.5～199.6 Ma; Great Dying③)
      • Class Cephalopod (Squid, Octopus, Cuttlefish, Nautilus, Ammonite)
        • Subclass Nautiloidea (Nautilus)
          Cephalopod Nectocaris   (505 Mya), Plectronoceras   (501～490 Mya), Endoceras   (488.3～443.7 Mya), Cameroceras   (488.3～445.6 Mya; ９m), Estonioceras   (488～472 Mya), Tarphyceras (478.6～443.7 Mya), Lituites   (466～418.7 Mya), Orthoceras   (479～203.6 Ma; Great Dying③), Actinoceras   (471.8～336 Mya), Cyrtoceras   (460.5～345.3 Mya), Rayonnoceras (339.4～312 Mya)
          • Order Nautilida (Nautiluses)
            Nautilus Cenoceras (199.6～155.7 Mya), Eutrephoceras   (171.6～28.4 Mya; Great Dying⑤), Cymatoceras (140.2～65.5 Mya), Heminautilus (125～112 Mya), Hercoglossa (65.5～33.9 Mya)
            Nautilus (Nautiluses) (245 Mya～; Living fossil), Palau Nautilus   (Palau), New Caledonia Nautilus   (New Caledonia), Chambered Nautilus   (Indo-West Pacific), Kobeso Nautilus   (Australia), Umbilicate Nautilus   (New Guinea)
        • Subclass Ammonoidea (Ammonites)
          Cephalopod Goniatites   (409.1～332.9 Mya), Soliclymenia   (385.3～359.2 Mya), Clymenia   (376.1～359.2 Mya), Araxoceras   (260.5～251 Mya), Cyclolobus (258～251 Mya), Ceratites   (245～216.5 Mya)
          • Order Ammonitida
            Ammonite Heteroceras   (130～70.6 Mya; Heteromorphs), Euhoplites   (112～93.5 Mya)
            • Suborder Ammonitina
              Ammonite Schloenbachia   (112～93.5 Mya), Parapuzosia   (99.6～70.6 Mya; １．９５m), Placenticeras   (99.6～65.5 Mya), Pachydiscus   (93.5～65.5 Mya; ２m)
            • Suborder Ancyloceratina
              Ammonite Crioceratites   (140.2～99.6 Mya), Scaphites   (112～70.6 Mya), Nipponites   (93.5～65.5 Mya; Heteromorphs), Bostrychoceras   (93.5～65.5 Mya), Polyptychoceras   (85.8～70.6 Mya), Didymoceras   (83.5–70.6 Mya), Pravitoceras   (83.5～70.6 Mya)
            • Suborder Phylloceratina
        • Subclass Coleoidea (Squid, Octopus, Cuttlefish)
      • Class Bivalvia (Clams, Oysters, Scallops, Mussels)