基眼類 基眼類學名Basommatophora舊稱基眼目原是腹足纲肺螺亚纲有肺類之下三個目級分類之一另外兩個是柄眼類和收眼類這些物種大多數生活在淡水中包括有淡水螺及蛞蝓 在年出版的布歇特和洛克羅伊的腹足類分類 whenever 单系群 has not been tested or where a traditional 分類單元 of gastropods has now been discovered to be 並系群 or 多系群 the term group or informal group was used 基眼類物種已知最早於石炭纪時就已存在直至現在的全新世 本分類單元絕大多數的成員均為能呼吸空氣的淡水螺當中數量最多的三個科即椎實螺科Lymnaeidae扁蜷科Planorbidae及膀胱螺科Physidae其物種廣泛分佈於世界各地的池塘溪澗溝渠及淺水湖內 但另一方面松螺科英语SiphonariidaeSiphonariidae英语Siphonariidae物種卻反過來重新回到海洋裡成為一種帽貝狀的海洋腹足綱軟體動物棲息於多石的潮間帶使牠們成為了一種在低潮時仍然能夠呼吸到空氣的海螺只有單一物種的两栖螺科是一種古老的物種仍然保留有螺厣 It lives at such a high tidal level that it could perhaps be considered semiterrestrial Members of the family Chilinidae英语Chilinidae are confined to temperate parts of South America and the Latiidae英语Latiidae are limpetlike and confined to New Zealand 基眼類得名於其物種的眼睛位於觸角的基底 Basommatophorans are characterized by having their eyes located at the base of their nonretractile tentacles rather than at the tips as in the true land snails 柄眼目 The majority of basommatophorans have shells that are thin translucent and relatively colorless and all except Amphibola lack an 螺厣