Trilobopsis is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of small, rounded, air-breathing land snail

Land snail

A land snail is any of the many species of snail that live on land, as opposed to those that live in salt water and fresh water. Land snails are terrestrial gastropod mollusks that have shells, It is not always an easy matter to say which species are terrestrial, because some are more or less...

s, terrestrial

Terrestrial animal

Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the water , or amphibians, which rely on a combination of aquatic and terrestrial habitats...

 pulmonate gastropod mollusks.

The shells of species in this genus are about 5 to 8 mm in diameter (or 1/4 to 3/16 inch).

The distribution is restricted to Oregon

Oregon

Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...

 and California

California

California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

, USA.

Snails in this genus are distinguished from related snails on the basis of their reproductive anatomy.

Species

• Trilobopsis loricata
  Trilobopsis loricata
  Trilobopsis loricata is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Polygyridae.- Subspecies :*Trilobopsis loricata lowei *Trilobopsis loricata mariposa Pilsbry, 1940...
  
  (Gould, 1846)
  • Trilobopsis loricata lowei (Pilsbry, 1925)
  • Trilobopsis loricata mariposa Pilsbry, 1940
  • Trilobopsis loricata nortensis (Berry, 1933)
  • Trilobopsis loricata perforata Pilsbry, 1940
  • Trilobopsis loricata sonomaensis (Hemphill, 1911)
• Trilobopsis penitens (Hanna & Rixford, 1923)
• Trilobopsis roperi (Pilsbry, 1889)
• Trilobopsis tehamana (Pilsbry, 1928)
• Trilobopsis trachypepla (Berry, 1933)