The Superorder Heterobranchia is further organized into finer groupings including:
- Order (7): Allogastropoda · Cephalaspidea · Heterobranchia · Heterostropha · Opisthobranchia · Perciformes · Pulmonata
Heterobranchia, the heterobranchs (meaning "different-gilled snails") or Euthyneura, is a taxonomic clade of snails and slugs, which includes species from the sea, the land and freshwater; marine, aquatic and terrestrial gastropod mollusks. [more]
Heterostropha was a previously used taxonomic category, an order of sea snails, within the superorder Heterobranchia. In the most current gastropod taxonomy, that of Bouchet & Rocroi, this taxon is no longer in use. [more]
Opisthobranchs () are a large and diverse group of specialized complex marine gastropods previously united under Opisthobranchia within the Heterobranchia, but no longer considered to represent a monophyletic grouping. Euopisthobrancha is a collection of opisthobranchs that is monophyletic, but this group leaves out some "traditional" opisthobranchs. [more]
Perciformes, also called the Percomorphi or Acanthopteri, is one of the largest orders of vertebrates, containing about 40% of all bony fish. Perciformes means "perch-like". They belong to the class of ray-finned fish, and comprise over 7,000 species found in almost all aquatic environments. It contains about 155 families, which is the most of any order within the vertebrates. They are also the most variably sized order of vertebrates, ranging from the 7 millimeters (0.28 in) Schindleria brevipinguis to the 5 meters (16 ft) Makaira species. They first appeared and diversified in the Late Cretaceous. Among well-known members of this group are cichlids, sunfish/bluegill, damselfish, bass, and, of course, perch. [more]
The Pulmonata, or "pulmonates", are an informal group (previously an order, and before that a subclass) of snails and slugs characterized by the ability to breathe air, by virtue of having a pallial lung instead of a gill, or gills. The group includes many land and freshwater families, and several marine families. [more]
At least 12,046 species and subspecies belong to the Order Pulmonata.
More info about the Order Pulmonata may be found here.
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