? Orthogastropoda
Geography Cone (Conus geographus)
Scientific classification
Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass: Orthogastropoda
Infraclasses
Apogastropoda Cocculiniformia Murchisoniina Neritopsina Vetigastropoda

In their work, which has become a standard reference in the field, Ponder and Lindberg (1997) showed that the Orthogastropoda is one of two subclasses of the Gastropoda the class of molluscs, the other subclass being the Eogastropoda. Conus geographicus (a marine snail) Downloaded from : [[1]] Credits : Kerry Matz National Institute of General Medical Services File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ... Phyla Subregnum Parazoa Porifera (sponges) Subregnum Agnotozoa Placozoa (trichoplax) Orthonectida (orthonectids) Rhombozoa (dicyemids) Subregnum Eumetazoa Radiata (unranked) (radial symmetry) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anemones) Bilateria (unranked) (bilateral symmetry) Acoelomorpha (basal) Orthonectida (parasitic to flatworms, echinoderms, etc. ... Classes Caudofoveata Aplacophora Polyplacophora Monoplacophora Bivalvia Scaphopoda Gastropoda Cephalopoda † Rostroconchia The mollusks or molluscs are the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood. ... Subclasses Eogastropoda Orthogastropoda The gastropods, gasteropods, or univalves, are the largest and most successful class of mollusks, with 60,000-75,000 extant species known, comprising the snails and slugs as well as a vast number of marine and freshwater species. ... Subclasses Eogastropoda Orthogastropoda The gastropods, gasteropods, or univalves, are the largest and most successful class of mollusks, with 60,000-75,000 extant species known, comprising the snails and slugs as well as a vast number of marine and freshwater species. ... Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ... Orders Docoglossa Eogastropoda is a subclass of the class Gastropoda, which includes the limpets. ...

This subclass, which one could call the true snails, is defined most briefly as all those gastropods which are not members of Patellogastropoda, the true limpets, or its ancestors. They form a monophyletic clade, supported by unambiguous synapomorphies. These synapomorphies (a series of characteristics that appear in its members but not in the other forms it diverged from) are the identifying characteristics of the clade. Suborders Lepetopsina Nacellina Patellina Docoglossa, also known as Patellogastropoda, is an order of the class Gastropoda, and includes the true limpets. Categories: | ... In phylogenetics, a group is monophyletic (Greek: of one stem) if all organisms in that group are known to have developed from a common ancestral form, and all descendants of that form are included in the group. ... This cladogram shows the relationship among various insect groups. ...

Some of the characterisitics are:

• eyes with a vitreous body on eyestalks.
• paired jaws, with their position free from the buccal mass
• a single kidney on the right side of pericardium
• a flexoglossate radula (with a flexible radular membrane). The radula is the snail's tongue, used as a rasping tool.
• unpaired osphradium (olfactory organ).
• lateral ciliated zones of osphradium
• a single left hypobranchial gland (on organ at gill, which releases secretions, such as the reddish dye Tyrian purple).
• an unpaired ctenidium (a comblike respiratory structure in certain mollusks)

Radula is the scientific name for the toothed chitinous ribbon in the mouth of gastropods. ... Tyrian purple is a purple dye made in the ancient Phoenician city of Tyre from a secretion of Spiny Dye-Murex (Murex brandaris), a marine snail. ...

Taxonomy

This taxonomy is still under revision.

Superorder Cocculiniformia Haszprunar, 1987

Superorder "Hot Vent Taxa" Ponder & Lindberg, 1997 (systematic position still uncertain)

• Order Neomphaloida Sitnikova & Starobogatov, 1983

Superorder Vetigastropoda Salvini-Plawen, 1989 (limpets)

Superorder Neritaemorphi Koken, 1896

• Order Neritopsina Cox & Knight, 1960

Superorder Caenogastropoda Cox, 1960 Caenogastropoda Categories: Animal stubs ...

• Order Architaenioglossa Haller, 1890
• Order Sorbeoconcha Ponder & Lindberg, 1997
  • Suborder Discopoda P. Fischer, 1884
  • Suborder Murchisoniina Cox & Knight, 1960
  • Suborder Hypsogastropoda Ponder & Lindberg, 1997

Superorder Heterobranchia J.E. Gray, 1840 Suborders Discopoda Murchisoniina Hypsogastropoda Sorbeoconcha is an order within the gastropod superorder Caenogastropoda. ... Orders Heterostropha Opisthobranchia Pulmonata This article does not cite its references or sources. ...

• Order Heterostropha P. Fischer, 1885
• Order Opisthobranchia Milne-Edwards, 1848
  • Suborder Cephalaspidea P. Fischer, 1883
  • Suborder Sacoglossa Von Ihering, 1876
  • Suborder Anaspidea P. Fischer, 1883 (sea hares)
  • Suborder Notaspidea P. Fischer, 1883
  • Suborder Thecosomata Blainville, 1824 (sea butterflies)
  • Suborder Gymnosomata Blainville, 1824 (sea angels)
• Order (not yet named)
  • Suborder Nudibranchia Blainville, 1814 (nudibranchs)
• Order Pulmonata Cuvier in Blainville, 1814 (pulmonates)
  • Suborder Systellommatophora Pilsbry, 1948
  • Suborder Basommatophora Keferstein in Bronn, 1864 (freshwater pulmonates, pond snails)
  • Suborder Eupulmonata Haszprunar & Huber, 1990

Suborders Cephalaspidea Sacoglossa Anaspidea Notaspidea Thecosomata Gymnosomata Nudibranchia   Infraorder Anthobranchia   Infraorder Cladobranchia For information on the anti-aircraft weapons system, see Sea Slug missile In zoology, the Opisthobranchia (Milne Edwards, 1848) (also known as opisthobranchs) used to be a subclass of gastropods, within the phylum Mollusca, but they are now... Superfamilies Acteonoidea Bulloidea Cylindrobulloidea Diaphanoidea Haminoeoidea Philinoidea Ringiculoidea The suborder Cephalaspidea or the headshield slugs is a suborder of mollusks from the order Opisthobranchia. ... Families Boselliidae Caliphyllidae Costasiellidae Cylindrobullidae Elysiidae Juliidae Limapontidae Oleidae Oxynoidae Stiligeridae Volvatellidae The suborder Sacoglossa, or the sap-sucking slugs Categories: Animal stubs ... Families Superfamily Akeroidea Akeridae Superfamily Aplysioidea Aplysiidae Sea hares (also called sea slugs) are small marine gastropod molluscs of the suborder Anaspidea (P. Fisher, 1883) in the subclass Orthogastropoda, class Gastropoda, phylum Mollusca. ... Families Limacinidae Cavoliniidae Clioidae Creseidae Cuvierinidae Praecuvierinidae Peraclididae Cymbuliidae Desmopteridae Sea butterflies, or flapping snails, are holoplanktonic mollusks (Mollusca, Gasteropoda), belonging to the suborder Thecosomata (Blainville, 1824). ... Families Clionidae Cliopsidae Hermaeidae Hydromylidae Laginiopsidae Notobranchaeidae Pneumodermatidae Thliptodontidae Sea angels are small pteropod mollusks of the suborder Gymnosomata. ... Infraorders See text Nudibranchs (Nudibranchia), form the largest suborder of the order Opisthobranchia, subclass Orthogastropoda, class Gastropoda in the phylum Mollusca. ... Suborders Systellommatophora Basommatophora Eupulmonata Taxonomy Order Pulmonata Cuvier in Blainville, 1814 (pulmonates) Suborder Systellommatophora Pilsbry, 1948 Superfamily Onchidioidea Rafinesque, 1815 Superfamily Otinoidea H. & A. Adams, 1855 Superfamily Rathouisioidea Sarasin, 1889 Suborder Basommatophora Keferstein in Bronn, 1864 (freshwater pulmonates, pond snails) Superfamily Acroloxoidea Thiele, 1931 Superfamily Amphiboloidea J.E. Gray, 1840...

References

• Gastropods on Land by G.M. Barker. Chapter 1 available online in PDF format here
• Orthogastropoda taxonomy at NCBI