|
The Helminthoglyptidae are a family of air-breathing land snails, terrestrial pulmonate gastropod mollusks in the superfamily Helicoidea. This is a large and diverse group of new world snails, ranging in distribution from Alaska through North America to the West Indies, Central America, and as far south as Argentina. The shells are typically of medium to large size, with no apertural teeth but usually with a reflected apertural lip. ==Anatomy== In the species in this family, the diverticulum may be present or absent. They possess a single dart appartus with one stylophore (dart sac) and two mucus glands. These snails use the love dart as part of their mating behavior. In this family, the number of haploid chromosomes lies between 26 and 30 (according to the values in this table).〔Barker G. M.: Gastropods on Land: ''Phylogeny, Diversity and Adaptive Morphology''. in Barker G. M. (ed.): ''(The biology of terrestrial molluscs )''. CABI Publishing, Oxon, UK, 2001, ISBN 0-85199-318-4. 1-146, cited pages: 139 and 142.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Helminthoglyptidae」の詳細全文を読む スポンサード リンク
|