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Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropodae
Subclassis: Orthogastropoda
Superordo: Heterobranchia
Ordo: Pulmonata
Subordo: Eupulmonata
Clade: Stylommatophora
Cladus: Orthurethra
Informal group: Sigmurethra
Superfamiliae: Acavoidea - Achatinoidea - Aillyoidea - Arionoidea - Buliminoidea - Clausilioidea - Dyakioidea - Gastrodontoidea - Helicoidea - Helicarionoidea - Limacoidea - Oleacinoidea - Orthalicoidea - Papillodermatoidea - Parmacelloidea - Plectopylidoidea - Punctoidea - Rhytidoidea - Sagdoidea - Staffordioidea - Streptaxoidea - Strophocheiloidea - Testacelloidea - Trigonochlamydoidea - Zonitoidea


Pupilloidea Turton, 1831

Sigmurethra is a taxonomic category of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This is an Informal Group which includes the majority of land snails and slugs.

The two strong synapomorphies of Sigmurethra are a long pedal gland placed beneath a membrane and retractile tentacles.[1]

Several families in this group contain species of snails and slugs that create love darts.

Sigmurethra are known from the Cretaceous to the Recent periods.[2]

In the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005, Sigmurethra is an "Informal Group", a subsection of the Stylommatophora.[3]

Superfamily Clausilioidea
Family Clausiliidae
† Family Anadromidae
† Family Filholiidae
† Family Palaeostoidae
Superfamily Orthalicoidea
Family Orthalicidae
Family Cerionidae
Family Coelociontidae
† Family Grangerellidae
Family Megaspiridae
Family Placostylidae
Family Urocoptidae
Superfamily Achatinoidea
Family Achatinidae
Family Ferussaciidae
Family Micractaeonidae
Family Subulinidae
Superfamily Aillyoidea
Family Aillyidae
Superfamily Testacelloidea
Family Testacellidae
Family Oleacinidae
Family Spiraxidae
Superfamily Papillodermatoidea
Family Papillodermatidae
Superfamily Streptaxoidea
Family Streptaxidae
Diapheridae - Sutcharit et al. (2010)[4] have established a new family Diapheridae within Streptaxoidea in 2010.[4]
Superfamily Rhytidoidea
Family Rhytididae
Family Chlamydephoridae
Family Haplotrematidae
Family Scolodontidae
Superfamily Acavoidea
Family Acavidae
Family Caryodidae
Family Dorcasiidae
Family Macrocyclidae
Family Megomphicidae
Family Strophocheilidae
Superfamily Punctoidea
Family Punctidae
† Family Anastomopsidae
Family Charopidae
Family Cystopeltidae
Family Discidae
Family Endodontidae
Family Helicodiscidae
Family Oreohelicidae
Family Thyrophorellidae
Superfamily Sagdoidea
Family Sagdidae

limacoid clade

Superfamily Staffordioidea
Family Staffordiidae
Superfamily Dyakioidea
Family Dyakiidae
Superfamily Gastrodontoidea
Family Gastrodontidae
Family Chronidae
Family Euconulidae
Family Oxychilidae
Family Pristilomatidae
Family Trochomorphidae
Fossil taxa probably belonging to the Gastrodontoidea
Subfamily † Archaeozonitinae
Subfamily † Grandipatulinae
Subfamily † Palaeoxestininae
Superfamily Parmacelloidea
Family Parmacellidae
Family Milacidae
Family Trigonochlamydidae
Superfamily Zonitoidea
Family Zonitidae
Superfamily Helicarionoidea
Family Helicarionidae
Family Ariophantidae
Family Urocyclidae
Superfamily Limacoidea
Family Limacidae
Family Agriolimacidae
Family Boettgerillidae
Family Vitrinidae

Two superfamilies belongs to clade Sigmurethra, but they are not in the limacoid clade.

Superfamily Arionoidea
Family Arionidae
Family Anadenidae
Family Ariolimacidae
Family Binneyidae
Family Oopeltidae
Family Philomycidae
Superfamily Helicoidea
Family Helicidae
Family Bradybaenidae
Family Camaenidae
Family Cepolidae
Family Cochlicellidae
Family Elonidae
Family Epiphragmophoridae
Family Halolimnohelicidae
Family Helicodontidae
Family Helminthoglyptidae
Family Humboldtianidae
Family Hygromiidae
Family Monadeniidae
Family Pleurodontidae
Family Polygyridae
Family Sphincterochilidae
Family Thysanophoridae
Family Trissexodontidae
Family Xanthonychidae

(Families that are exclusively fossil are indicated with a dagger †)

^ Lunarejo. et al. 2008.
^ (in Czech) Pek I., Vašíček Z., Roček Z., Hajn. V. & Mikuláš R.: Základy zoopaleontologie. - Olomouc, 1996. 264 pp., ISBN 80-7067-599-3.
^ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. Issn = 0076-2997. 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278
^ a b Sutcharit C., Naggs F., Wade C. M., Fontanilla I. & Panha S. (2010). "The new family Diapheridae, a new species of Diaphera Albers from Thailand, and the position of the Diapheridae within a molecular phylogeny of the Streptaxoidea (Pulmonata: Stylommatophora)". Zoological Journal of the Linnean Society 160: 1-16. doi:10.1111/j.1096-3642.2009.00598.x.

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