page_title: Taxonomy of commonly fossilised invertebrates
section_title: Phylum Mollusca
hierarchical_section_title: Taxonomy of commonly fossilised invertebrates / Super-phylum of Lophotrochozoa / Protostomia # 1 / Phylum Mollusca
caption_attribution_description: English: Peltoceras solidum ammonite from the Matmor Formation (Jurassic, Callovian) in the Matmor Formation, Makhtesh Gadol, Israel. Українська: Зовнішній зліпок амоніту роду Peltoceras solidum з формації Matmor (Келловей, Юра), Makhtesh Gadol, Ізраїль.
context_page_description: Although the phylogenetic classification of non-vertebrate animals remains a work-in-progress, the following taxonomy attempts to be useful by combining both traditional and new paleozoological terminology.
  The paleobiologic systematics which follows is not intended to be all-inclusive or completely comprehensive. For practical reasons and relevancy, the below classification and annotations emphasize invertebrates that are popularly collected as fossils and/or no longer continue alive on this planet. Therefore, as a result, some phyla, classes, and orders of invertebrates are not listed.
  If a non-vertebrate animal is mentioned below using its common, or vernacular name, the creature is usually a living, present-day invertebrate. But if a non-vertebrate is cited below by its scientific, taxonomic genus, then it is typically an extinct invertebrate, known only from the fossil record.
  Invertebrate clades that are very important as fossils, and/or very abundant as fossils, are highlighted with a bracketed exclamation mark [! ].
context_section_description: (molluscs or mollusks, not to be confused with the hard-shelled marine brachiopods above)
  Class Monoplacophora (extinct, except for "living fossil" Neopilina)
  Class Bivalvia / Pelecypoda (bivalves / pelecypods) – half of all documented species of Bivalvia are fossils and extinct 
  Subclass Lamellibranchia [!] (clams, oysters, mussels and scallops)
  Class Gastropoda (gastropods / snail group)
  Subclass Prosobranchia (marine snails and conches)
  Subclass Opisthobranchia (sea slugs)
  Subclass Pulmonata (land snails)
  Class Cephalopoda (cephalopods) – 97 percent of all documented species of Cephalopoda are now extinct
  Subclass Nautiloidea (mostly extinct, but includes "living fossil" Nautilus)
  Order Orthocerida [†] [!] (long, straight-shelled nautiloids)
  Subclass Ammonoidea [†] [!] (generally coiled-shelled ammonoids)
  Agoniatitic (agoniatites) [†]
  Goniatitic (goniatites) [†] [!] (ammonoids with simple sutures)
  Ceratitic (ceratites) [†]
  Ammonitic [†] [!] (the true ammonites, bearing complex sutures)
  Subclass Coleoidea (includes the living squid, cuttlefish, and octopus)
  Order Belemnoidea [†] (extinct orthoconic belemnoids)
caption: Peltoceras solidum ammonite from the Matmor Formation (Jurassic, Callovian) in the Matmor Formation, Makhtesh Gadol, Israel.
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