Parthenina
Two shells of Parthenina terebellum
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subcohort:	Panpulmonata
Superfamily:	Pyramidelloidea
Family:	Pyramidellidae
Genus:	Parthenina Bucquoy, Dautzenberg & Dollfus, 1883[1]
Synonyms
Chrysallida (Parthenina) Bucquoy, Dautzenberg & Dollfus, 1883 Egilina (Prestoniella) Saurin, 1958 Elodia de Folin, 1870 Elodiamea de Folin, 1886 Odostomia (Parthenina) Bucquoy, Dautzenberg & Dollfus, 1883 Pselliogyra Dall & Bartsch, 1909 Pyrgulina (Parthenina) Bucquoy, Dautzenberg & Dollfus, 1883 Tiberia (Tiberiella) Coen, 1933 Tiberiella Coen, 1933 Turbonilla (Pselliogyra) Bucquoy, Dautzenberg & Dollfus, 1883 (superseded combination)

Parthenina is a genus of very small sea snails, pyramidellid gastropod mollusks or micromollusks.^[2]

This genus was previously placed in the subfamily Chrysallidinae of the family Odostomiidae. The name Parthenia was created by Lowe in 1840 for the species in this group, but had to be replaced since it was preoccupied by a name for a group of dipterans described by Roubineau-Desvoidy in 1830.

In the original description Bucquoy, Dautzenberg & Dollfus (1833)^[1] states (in English translation) that Partnenina is a type of Odostomia with a mesh-like surface or with longitudinal ridges. Between these ridges there are series of spiral ridges. Many of the European species in the genus have for a long time been wrongly placed in the genus Chrysallida, but Schander et al. (2003)^[3] showed that they should indeed be placed in the genus Parthenina. This separation was followed by Pimenta et al. (2009)^[4] for Brazilian species.

The synonymy with Besla Dall & Bartsch, 1904 proposed by Micali et al. (2012) is debatable. The type species of Besla has a protoconch axis at 90° with that of teleoconch ("type A protoconch") whereas that of Parthenina is tilted nearly 180° ("type C"); this important character suggests that they are unrelated and that their teleoconch sculpture may be convergent^[5]

The Eastern Atlantic and Mediterranean species of the family Pyramidellidae, here listed under the genus Parthenina Bucquoy, Dautzenberg & Dollfus, 1883, have been included by most 20th-century European authors in the genus Chrysallida Carpenter, 1856, following a lead by Winckworth (1932). The first explicit statement that this is incorrect was voiced by van Aartsen, Gittenberger & Goud (2000: 21) "None of the many species from European Atlantic and Mediterranean waters currently included in Chrysallida conforms exactly to the description of the genus sensu stricto", but they still used Chrysallida as a genus and used Parthenina and other names as subgenera. Micali, Nofroni & Perna (2012) formally raised Parthenina to the rank of genus and included a number of European species, whereas other congeners not treated in that paper were still listed in WoRMS and elsewhere as Chrysallida. Hoisaeter (2014) transferred some more species but still listed five species under Chrysallida. The current treatment follows Giannuzzi-Savelli, Pusateri, Micali, Nofroni & Bartolini (2014) who provided a quite sensible treatment and transferred the relevant Mediterranean species to Parthenina and other genera, without any species retained in Chrysallida. This scheme yet has to be tested against a phylogenetic hypothesis based on molecular sequence data.^[2]

The genus is parasitic, manly on serpulid polychaete worms. They are known to have spermatophores.^[6]

Species within the genus Parthenina include:

Species brought into synonymy

• Parthenina atlantica Locard, 1897: synonym of Turbonilla atlantica (Locard, 1897)
• Parthenina bucquoyi Locard, 1886: synonym of Odostomella doliolum (Philippi, 1844)
• Parthenina caduca (Laseron, 1959): synonym of Elodiamea caduca Laseron, 1959
• Parthenina desmoulinsiana Locard, 1886: synonym of Chrysallida terebellum (Philippi, 1844): synonym of
• Parthenina flexicosta Locard, 1886: synonym of Parthenina interstincta (J. Adams, 1797)
• Parthenina gracilis (Yokoyama, 1926): synonym of Egilina gracilis (Yokoyama, 1926)
• Parthenina incerta Milaschewitsch, 1916: synonym of Spiralinella incerta (Milaschewich, 1916)
• Parthenina monocycla (Yokoyama, 1922): synonym of Parthenina pagodula (A. Adams, 1860)
• Parthenina multicostata (Laseron, 1959): synonym of Elodiamea multicostata Laseron, 1959
• Parthenina ora (Laseron, 1959): synonym of Elodiamea ora Laseron, 1959
• Parthenina proiectura (Laseron, 1959): synonym of Elodiamea proiectura Laseron, 1959
• Parthenina tenuistriata Milaschewitsch, 1909: synonym of Parthenina juliae (de Folin, 1872)

• Bucquoy E., Dautzenberg P. & Dollfus G. (1882-1886). Les mollusques marins du Roussillon. Tome Ier. Gastropodes. Paris, J.B. Baillière & fils 570 p., 66 pl. [pp. 1-40, pl. 1-5, February 1882; pp. 41-84, pl. 6-10, August 1882; pp. 85-135, pl. 11-15, February 1883; pp. 136-196, pl. 16-20, August 1883; pp. 197-222, pl. 21-25, January 1884; pp.223-258, pl. 26-30, February 1884; pp. 259-298, pl. 31-35, August 1884; pp.299-342, pl. 36-40, September 1884; p. 343-386, pl. 41-45, February 1885; p. 387-418, pl. 46-50, August 1885; pp. 419-454, pl. pl. 51-60, January 1886; p. 455-486, pl. 56-60, April 1886; p. 487-570, pl. 61-66, October 1886
• Micali P., Nofroni I. & Perna E. (2012) Parthenina alesii n. sp. from Eastern Mediterranean, and notes on Parthenina dantarti (Peñas & Rolán in Peñas, Rolán & Ballesteros, 2008) (Gastropoda: Heterobranchia: Pyramidellidae). Bollettino Malacologico 48(1): 69–72.
• Tore Høisæter (2014) The Pyramidellidae (Gastropoda, Heterobranchia) of Norway and adjacent waters. A taxonomic review; Fauna norvegica 2014 Vol. 34: 7-78.
• Peñas A. & Rolán E. (2017). Deep water Pyramidelloidea from the central and South Pacific. The tribe Chrysallidini. ECIMAT (Estación de Ciencias Mariñas de Toralla), Universidade de Vigo. 412 pp.

Wikimedia Commons has media related to Parthenina.

• Photo of the shell of Parthenina interstincta