Editing Radula (section)

===Gastropods with no radula===
The [[streptaxid]] ''[[Careoradula perelegans]]'' is the only known terrestrial gastropod which has no radula.<ref name="Gerlach 1998">{{cite journal | last1 = Gerlach | first1 = J. | last2 = van Bruggen | first2 = A. C. | year = 1998 | title = A first record of a terrestrial mollusk without a radula | journal = Journal of Molluscan Studies | volume = 64 | issue = 2| pages = 249–250 | doi = 10.1093/mollus/64.2.249 | doi-access = free }}</ref>

Some marine gastropods lack a radula. For example, all species of sea slugs in the family [[Tethydidae]] have no radula,<ref name="seaslugforum">[[William B. Rudman|Rudman W. B.]] (14 October 2002) [http://www.seaslugforum.net/factsheet.cfm?base=tethfimb "http://www.seaslugforum.net/factsheet.cfm?base=tethfimb"]. Sea Slug Forum, accessed 29 December 2010.</ref> and a clade of dorids (the Porostomata)<ref name="Valdés2003">{{Cite journal | doi = 10.1093/mollus/69.1.75 | last1 = Valdés | first1 = A. | title = Preliminary Molecular Phylogeny of the Radula-Less Dorids (Gastropoda: Opisthobranchia), Based on 16S Mtdna Sequence Data | journal = Journal of Molluscan Studies | volume = 69 | pages = 75–80 | year = 2003 | doi-access = free }}</ref> as well as all species of the genus'' [[Clathromangelia]]'' (family Clathurellidae)<ref>{{cite journal | last1 = Oliverio | first1 = M | year = 1995 | title = The systematics of the radula-less gastropod Clathromangelia (Caenogastropoda, Conoidea) | journal = Zoologica Scripta | volume = 24 | issue = 3| pages = 193–201 | doi=10.1111/j.1463-6409.1995.tb00399.x| s2cid = 85202876 }}</ref> likewise lack the organ. The radula has been lost a number of times in the Opisthobrancha.<ref>{{Cite journal | title = Morphological Parallelism in Opisthobranch Gastropods | year  = 1991 | url = https://archive.org/details/malacologia329091inst | pages = 313–327 | journal = Malacologia}}</ref>