Parhedylidae

Parhedylidae are a taxonomic family of sea slugs, marine gastropod mollusks in the superfamily Parhedyloidea.

2005 taxonomy
Microhedylidae has been listed as a synonym of Parhedylidae in the taxonomy of Bouchet & Rocroi (2005). Ganitidae Rankin, 1979 has been listed as a sole family within Hedylopsoidea. The type genus of Livorniellidae was Livorniella Rankin, 1979.

2010 taxonomy
Sensu Schrödl & Neusser (2010) is Microhedylidae within the clade Microhedylacea. Parhedylidae is a synonym of Microhedylidae. Microhedylidae s.l. may informally include Ganitidae, but inclusion of Ganitidae within Microhedylidae requires further research and higher statistical support.

Genera
Genera within the Parhedylidae include:
 * Ganitus Marcus, 1953 - with the only species Ganitus evelinae Marcus, 1953 - it belongs to Microhedylidae s.l. / Ganitidae
 * Microhedyle Hertling, 1930
 * Microhedyle glandulifera (Kowalevsky, 1901)
 * Microhedyle nahantensis (Doe, 1974)
 * Microhedyle odhneri (Ev. Marcus & Er. Marcus, 1955)
 * Microhedyle remanei (Er. Marcus, 1953)
 * Paraganitus Challis, 1968 - with the only species Paraganitus ellynnae Challis, 1968 - it belongs to Microhedylidae s.l. / Ganitidae
 * Paraganitus Challis, 1968
 * Parhedyle Thiele, 1931
 * Parhedyle cryptophthalma (Westheide & Wawra, 1974)
 * Parhedyle tyrtowii (Kowalevsky, 1900)
 * Parhedyle gerlachi (Ev. Marcus & Er. Marcus, 1959)
 * Pontohedyle Golikov & Starobogatov, 1972
 * Genera brought into synonymy:
 * Gastrohedyle Rankin, 1979 : synonym of Pontohedyle Golikov & Starobogatov, 1972
 * Livorniella Rankin, 1979 : synonym of Microhedyle Hertling, 1930
 * Mancohedyle Rankin, 1979 : synonym of Pontohedyle Golikov & Starobogatov, 1972 (junior objective synontm of Pontohedyle)
 * Maraunibina Rankin, 1979 : synonym of Pontohedyle Golikov & Starobogatov, 1972
 * Parahedyle [sic]: synonym of Parhedyle Thiele, 1931 (misspelling)
 * Sabulincola Rankin, 1979 : synonym of Parhedyle Thiele, 1931
 * Stellaspina Rankin, 1979 : synonym of Microhedyle Hertling, 1930
 * Unela Er. Marcus, 1953 : synonym of Microhedyle Hertling, 1930

Cladogram
A cladogram based on sequences of mitochondrial 28S ribosomal RNA, 16S ribosomal RNA and cytochrome-c oxidase I (COI) genes showing phylogenic relations within the family Microhedylidae: