Pseudozygopleuridae, Knight, 1930

Webster, Nicole B & Vermeij, Geerat J, 2017, The varix: evolution, distribution, and phylogenetic clumping of a repeated gastropod innovation, Zoological Journal of the Linnean Society 180 (4), pp. 732-754 : 737

publication ID	https://doi.org/10.1093/zoolinnean/zlw015
persistent identifier	https://treatment.plazi.org/id/552787AC-FFAB-FFCE-6914-4726FC44F885
treatment provided by	Plazi
scientific name	Pseudozygopleuridae
status

Treatment

? Pseudozygopleuridae View in CoL

Spanionema is the earliest known genus with varices, from the Givetian (Middle Devonian). The varices are irregularly placed and relatively pronounced ( Knight et al., 1960; Heidelberger, 2001). The relationships of this genus are uncertain, but it clearly represents a separate origin of varices, with no known varicate relatives.