Metazoa		Gastropoda
MOLLUSCA		Cladogram

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Gastropod Cladogram

GASTROPODA (stem group)
|--PARAGASTROPODA  
`--+--TERGOMYA (paraphyletic)
   `--Gastropoda (crown group)  
      |--EOGASTROPODA  
      |  |--Macluritoidea
      |  `--PATELLOGASTROPODA
      `--ORTHOGASTROPODA  
         |--NERITOPSINA
         |  |--Neritoida
         |  `--VETIGASTROPODA
         `--Apogastropoda

Gastropod phylogeny is in near total dissaray.  For organizational purposes only, we will follow this cladogram:

CYRTOSOMA
|--+--Scaphopoda  
|  `--CEPHALOPODA  
`--GASTROPODA (stem group)
   |--Paragastropoda
   |  |--Pelagiellida (= Pelagielloidea)
   |  `--Mimospirida (= Onychochiloidea) 
   `--+--Tergomya (paraphyletic)
      |-?Bellerophontida?
      `--Gastropoda (crown group)
         |--Eogastropoda
         |  `--Euomphalida (=-na?)
         |     |--Macluritoidea
         |     `--+--Euomphaloidea  
         |        `--Patellogastropoda (stem group)
         |           `--Metoptomatidae
         `--Orthogastropoda 
            ?= Sinuopeidae)
            |-? Murchisoniida
            |--Neritopsina
            |  |--Neritoida
            |  `--+--Cocculinoidea
            |     `--Vetigastropoda
            `--APOGASTROPODA  
               |--Caenogastropoda 
               |  |--Architaenioglossa  
               |  `--Sorbeoconcha  
               |     |--Neogastropoda  
               |     `--everything else 
               `--HETEROBRANCHIA  
                  |--Opisthobranchia 
                  |  |--Sacoglossa 
                  |  `--+--Cephalaspidea (followed by various others)
                  |     `--Nudibranchia 
                  `--PULMONATA 
                     |--Systellommatophora
                     `--+--Basommatophora
                        `--+--Acteophila
                           `--Stylommatophora

This scheme reflects some elements found in the following references:

Grande, C, J Templado, JL Cervera & R Zardoya (2004), Molecular phylogeny of Euthyneura (Mollusca: Gastropoda).  Mol. Biol. Evol. 21: 303–313. WWW

Ponder, WF & DR Lindberg (1997), Towards a phylogeny of gastropod molluscs: Analysis using morphological characters. Zool. J. Lin. Soc. 119: 83-265.

Sasaki, T (1998), Comparative anatomy and phylogenyof the Recent Archaeogastropoda (Mollusca: Gastropoda).  Univ. Tokyo Mus. Bull. No. 38, ??pp.  WWW

A fuller classification, which has not yet been converted to a proper cladogram format, shows the relationships of various recent and fossil groups according to a Linnean format.

Class GASTROPODA
	INCERTÆ SEDIS
		INCERTÆ SEDIS
			Pragoscutulidae Frýda, 1998
			Pragoserpulinidae Frýda, 1998
		Order MIMOSPIRINA
			Onychochiloidea

	Subclass EOGASTROPODA
		Order EUOMPHALINA 
			Ophiletoidea
			Euomphaloidea
			Platyceratoidea

		Order DOCOGLOSSA [=PATELLOGASTROPODA ]

	Subclass ORTHOGASTROPODA
		INCERTÆ SEDIS
			Order MURCHISONIINA {fide Wagner, undated} 
				Murchisonioidea
				Loxonematoidea
				Lophospiroidea [=Trochonematacea & Eotomarioidea]
				Grade Subulitoidea  
			Superorder NERITOPSINA [=NERITIMORPHA]
				Order CYRTONERITIMORPHA
					Orthonychiidae Bandel & Frýda, 1999 (euomphalid like???)
					Vltaviellidae Bandel & Frýda, 1999  (euomphalid like???)
				Order NERITOIDA [=CYCLONERITIMORPHA]
					Neritoidea
					Symmetrocapuloidea
					?Peltospiroidea
					?Palaeotrochoidea
				Order Neomphalida
					Neomphaloidea
			Superorder VETIGASTROPODA
			Superorder COCCULINIFORMIA

		Infraclass APOGASTROPODA
			Superorder CAENOGASTROPODA 
				INCERTÆ SEDIS
					Incertæ sedis
						Ladinulidae Bandel, 1992
						Lanascalidae Bandel, 1992
						Popenellidae Bandel, 1992
						Prostyliferidae Bandel, 1992
						Settsassiidae Bandel, 1992
					Pseudomelanioidea
						Pseudomelaniidae Fischer, 1885 [=Trajanellidae Pchelintsev, 1953]
				Order ARCHITAENIOGLOSSA 
				Order SORBEOCONCHA {Cerithioidea to Buccinoidea}
					?Spanionematoidea Golikov & Starobogatov, 1987
					Cerithioidea
					Campaniloidea [=suborder Campanilimorpha]
						Campanilidae Douvillé, 1904
						Plesiotrochidae Houbrick 1990
					Suborder HYPSOGASTROPODA {Calyptraeoidea to Buccinoidea} [LATROGASTROPODA Riedel, 2000]
						?Superfamily
							?Weeksiidae Sohl, 1960
						infraorder LITTORINIMORPHA 
						infraorder PTENOGLOSSA 
						infraordinal grade NEOGASTROPODA 

			Superorder HETEROBRANCHIA {TRIGANGLIONATA to EUTHYNEURA} [=HETEROSTROPHA sensu Bandel]
				INCERTÆ SEDIS
					Incertæ sedis
						Dolomitellidae Bandel, 1994 {Triassic}
						Misurinellidae Bandel, 1994 {Triassic}
						Zardinellidae Bandel, 1994 {Triassic}
				Ordinal Grade TRIGANGLIONATA [=ALLOGASTROPODA, & HETEROSTROPHA ]
				Intraorder EUTHYNEURA {OPISTHOBRANCHIA + PULMONATA - monophyletic fide Yoon & Kim, 2000 and Wade & Mordan, 2000} 
					Ordinal Grade OPISTHOBRANCHIA[=OPISTHOBRANCHIATA]
					Order PULMONATA

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