Archaeogastropoda

Taxobox
name = Archaeogastropoda
fossil_range= fossil range|Late Cambrian|Recent


image_width = 240px
image_caption = "Turbo spp."
regnum = Animalia
phylum = Mollusca
classis = Gastropoda
subclassis = Prosobranchia
ordo = Archaeogastropoda
ordo_authority = Thiele, 1925
subdivision_ranks = Families
subdivision = See text.

Archaeogastropoda is (or more accurately was) a taxonomic order of sea snails. Archeogastropoda are "primitive" marine prosobranch gastropod mollusks. They typically have two gills and usually a double chambered heart. They are herbivores. Eggs and sperm are discharged directly into the water.

This old-style taxonomy of the gastropods, as is found in many older manuals and even on many websites, is based on the classification of Thiele (1925). This classification was not based on true phylogenetic relationships, but on overall similarity between the species.

In the last few years, a new taxonomy of the gastropods has come into common use, and the new taxonomy is strictly cladistic. This has led to an extensive reclassification of gastropod taxa. Archaeogastropoda is a paraphyletic group, and in strictly cladistic classifications, the occurrence of such groups is no longer accepted.

Many of the former Archaeogastropoda are therefore now included in :
*subclass Eogastropoda
**order Patellogastropoda (limpets)
*subclass Orthogastropoda
**Superorder Vetigastropoda Salvini-Plawen, 1989
**Superorder Neritaemorphi Koken, 1896 (with the order Neritopsina Cox & Knight, 1960).

A more detailed classification can be found on Gastropoda.

Traditional classification

*Order Archaeogastropoda
**Superfamily Pleurotomariacea
***Family Pleurotomariidae
***Family Haliotidae
***Family Scissurellidae
**Superfamily Fissurellacea
***Family Fissurellidae
**Superfamily Patellacea
***Family Patellidae
***Family Acmaeidae
***Family Lepetidae
**Superfamily Trochacea
***Family Calliostomatidae
***Family Trochidae
***Family Stomatellidae
***Family Cyclostrematidae
***Family Turbinidae
***Family Phasianellidae
**Superfamily Neritacea
***Family Neritidae
***Family Helicinidae
***Family Hydrocenidae