apex (mollusc)

透螺科物種的螺殻微小、薄而且脆，一般透明或半透明，通常都小於5 mm in size。整體來說，螺殻呈卵形、梨形或球莖形。殻頂（英语：apex (mollusc)）凹陷。 根據2005年《布歇特和洛克羅伊的腹足類分類》，透螺科是透螺總科的成員，包括下列兩個科： 透螺總科 Diaphanoidea

It may be smooth or have spiral grooves (striae). The umbilical apex（英语：Apex (mollusc)） is sunken or enclosed and no longer visible. Large body whorl（英语：body

spire（英语：Spire (mollusc)） is depressed, dome-shaped with an apex that is frequently eroded and red. The shell contains 4 to 5 whorl（英语：Whorl (mollusc)）s, the

angulatus Möllendorff, 1887 Macrochlamys anonae Godwin-Austen, 1883 Macrochlamys apex Möllendorff, 1888 Macrochlamys aspides (W.H.Benson, 1863) Macrochlamys atoma

Simonetta, Alberto; Ivantsov, Andrei Yu. New data on Kimberella, the Vendian mollusc-like organism (White Sea region, Russia): palaeoecological and evolutionary