Archaeogastropoda
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The Archaeogastropoda used to be an order of primitive marine gastropods. They have two gills and usually a double chambered heart. They are herbivores. Eggs and sperm are discharged directly to the water.
The taxonomy of the gastropods, as found in many older manuals and still on many websites, is still based on the classification of Thiele (1925). This classification was not based on evolutionary relationships, but on overall similarity between the species.
For a systematic classification, one should always use the most current literature. In the last few years, a new taxonomy of the gastropods has come into use. This taxonomy is based on phylogenetic systematics; see Phylogenetics, Phylogenetic tree and Cladistics. This has led to an extensive reclassification of taxa
The Archaeogastropoda are a blatantly paraphyletic group, i.e. a group with a common ancestor, but the group does not include all the descendants of the group. In cladistic classifications, the occurrence of a paraphyletic group is considered as an error.
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.
Classification (no longer in current use)
- Order Archaeogastropoda
- Superfamily Pleurotomariacea
- Family Pleurotomariidae
- Family Haliotidae
- Superfamily Fissurellacea
- Family Fissurellidae
- Superfamily Patellacea
- Family Patellidae
- Family Acmaidae
- Family Lepetidae
- Superfamily Trochacea
- Family Trochidae
- Family Stomatellidae
- Family Cyclostrematidae
- Family Turbinidae
- Family Phasianellidae
- Superfamily Neritacea
- Family Neritidae
- Family Helicinidae
- Family Hydrocenidae
- Superfamily Pleurotomariacea