Rachis (gastropod)

This article is about the genus of land snails. For the morphological term, see Rachis. For the king of the Lombards, see Ratchis. For the Romanian village of Rachiş, see Mirăslău.

Rachis
Shell of Rachis venusta (syntype at MNHN, Paris)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Infraorder:	Pupilloidei
Superfamily:	Pupilloidea
Family:	Cerastidae
Genus:	Rachis Albers, 1850 [1]
Type species
Bulimus pallens Jonas, 1843
Synonyms [2]
Buliminus (Rachis)Albers, 1850 Buliminus (Rhachis)L. Pfeiffer, 1856 Bulimus (Rachis)Albers, 1850 (original rank) Bulimus (Rhachis)L. Pfeiffer, 1856 (superseded combination) Ena (Rachisellus)Bourguignat, 1890 (junior synonym) Rachis (Rachis)Albers, 1850 RachisellusBourguignat, 1890 RhachisL. Pfeiffer, 1856 (invalid: unjustified emendation of RachisAlbers, 1850)

Rachis is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Cerastidae. ^[2]

This genus is also spelled as “Rhachis” as a synonym. ^[3] Rachis is a Latinised version of rhachis (a midrib or ridge) or rhachos (a thorn or thorn bush), both of which are Greek nouns of feminine gender. ^[2]

Species

• Rachis ambongoensis Fischer-Piette, 1964
• Rachis aurea (Heude, 1890)
• Rachis badiola (Morelet, 1881)
• Rachis bewsheri (Morelet, 1877)
• Rachis catenata (E. von Martens, 1860)
• Rachis comorensis (Morelet, 1881)
• Rachis cunctatoris van Bruggen, 1975
• Rachis electrina (Morelet, 1864)
• Rachis elongatula Bourguignat, 1890
• Rachis fagotiana (Ancey, 1885)
• Rachis genalensis Kobelt, 1910
• Rachis gracillima F. Haas, 1936
• Rachis humbloti (Morelet, 1888) (accepted > unreplaced junior homonym)
• Rachis ingenua (Morelet, 1864)
• Rachis jejuna (Melvill & Ponsonby, 1893) ^[4]
• Rachis nigrilineata (Reeve, 1849)
• Rachis obeliscus C. R. Boettger, 1913
• Rachis pachistoma Bourguignat, 1890
• Rachis punctata (Anton, 1838) ^[5]
• Rachis stahlbergi C. R. Boettger, 1913
• Rachis tulearensis Fischer-Piette, 1964 ^[6]
• Rachis venusta (Morelet, 1861)
• Rachis zonulata (L. Pfeiffer, 1846)

Synonyms

• Rachis aldabrae(E. von Martens, 1898): synonym of Rhachistia aldabrae (E. von Martens, 1898) (unaccepted combination)
• Rachis badiolus: synonym of Rachis badiola(Morelet, 1881) (incorrect grammatical agreement of specific epithet)
• Rachis bidwilli(Cox, 1868): synonym of Rhachistia histrio (L. Pfeiffer, 1855)
• Rachis bloyetiBourguignat, 1890: synonym of Rhachidina braunsii(E. von Martens, 1869): synonym of Rhachistia braunsii (E. von Martens, 1869) (junior synonym)
• Rachis boehmi(E. von Martens, 1895): synonym of Rhachistia boehmi (E. von Martens, 1895)
• Rachis braunsii(E. von Martens, 1869): synonym of Rhachistia braunsii (E. von Martens, 1869) (superseded combination)
• Rachis burnayi(Dohrn, 1866): synonym of Gittenedouardia burnayi (Dohrn, 1866)
• Rachis burtoi (Bourguignat, 1890): synonym of Rachis punctata(Anton, 1838) (junior synonym)
• Rachis chalcedonica(Gredler, 1887): synonym of Mirus chalcedonicus (Gredler, 1887) (unaccepted combination)
• Rachis dohrni(Greeff, 1882): synonym of Aporachis dohrni (Greeff, 1882)
• Rachis eminula(Morelet, 1848): synonym of Gittenedouardia eminula (Morelet, 1848)
• Rachis erlangeriKobelt, 1910: synonym of Rhachistia erlangeri (Kobelt, 1910) (unaccepted combination)
• Rachis fagotianus: synonym of Rachis fagotiana(Ancey, 1885) (incorrect grammatical agreement of specific epithet)
• Rachis hieroglyphicusPreston, 1910: synonym of Rachis hieroglyphicaPreston, 1910 (incorrect grammatical agreement of specific epithet)
• Rachis hispida(Greeff, 1882): synonym of Aporachis hispida (Greeff, 1882)
• Rachis ingenuus: synonym of Rachis ingenua(Morelet, 1864) (incorrect grammatical agreement of specific epithet)
• Rachis joubertiBourguignat, 1890: synonym of Rhachidina braunsii var. succincta(E. von Martens, 1879): synonym of Rhachistia braunsii (E. von Martens, 1869)
• Rachis libbahensis(Tomlin, 1910): synonym of Zebrinops libbahensis (Tomlin, 1910)
• Rachis moluensisKobelt, 1910: synonym of Rhachistia moluensis (Kobelt, 1910)
• Rachis nigrilineatus(Reeve, 1849): synonym of Rachis nigrilineata(Reeve, 1849) (incorrect grammatical agreement of specific epithet)
• Rachis onychinus(Heude, 1885): synonym of Sinorachis onychinus (Heude, 1885) (unaccepted combination
• Rachis petersi(Pfeiffer, 1855): ^[7] synonym of Pleurorhachis petersi (L. Pfeiffer, 1855) (superseded combination)
• Rachis punctatus(Anton, 1838): synonym of Rachis punctata(Anton, 1838) (incorrect grammatical agreement of specific epithet)
• Rachis rorkorensisKobelt, 1910: synonym of Rhachistia rorkorensis (Kobelt, 1910)
• Rachis succincta(E. von Martens, 1879): synonym of Rhachistia braunsii (E. von Martens, 1869) (junior synonym)
• Rachis turriculaPreston, 1911: synonym of Gittenedouardia turricula (Preston, 1911) (original combination)
• Rachis venustus(Morelet, 1861): synonym of Rachis venusta(Morelet, 1861) (incorrect grammatical agreement of specific epithet)
• Rachis vesiculatus(Benson, 1859): synonym of Rhachistia vesiculata (Benson, 1859) (incorrect grammatical agreement of specific epithet)
• Rachis vicinusPreston, 1910: synonym of Rhachistia chiradzuluensis (E.A. Smith, 1899) (junior synonym)
• Rachis virgineaPreston, 1911: synonym of Rhachistia chiradzuluensis var. virginea(Preston, 1911) (original combination)

References

1. Albers, J. C. (1850). Die Heliceen, nach natürlicher Verwandtschaft systematisch geordnet. Berlin: Th. Chr. Fr. Enslin.
2. MolluscaBase eds. (2022). MolluscaBase. Rachis Albers, 1850. Accessed through: World Register of Marine Species at: https://marinespecies.org/aphia.php?p=taxdetails&id=995163 on 31 March 2022
3. "WMDSB-Cerastidae". Cerastidae.
4. Melvill, J. C. & Ponsonby, J. H. (1893). Descriptions of twenty new species of terrestrial and fluviatile Mollusca from South Africa. Annals and Magazine of Natural History, 12(68), 103–112.
5. Anton, H. E. (1839). Verzeichniss der Conchylien welche sien in der Sammlung. Halle: Eduard Anton.
6. "WMDSB-Cerastidae". Rhachis tulearensis.
7. Pfeiffer, L. (1855). Description of thirty-eight new species of Helicea, from the collection of H. Cuming, Esq. Proceedings of the Zoological Society of London, 23, 91–101.

• Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: 16 July 2017

External links

• Media related to Rachis at Wikimedia Commons
• Albers, J. C. (1850). Die Heliceen nach natürlicher Verwandtschaft systematisch geordnet. Berlin: Enslin. 262 pp.
• Bourguignat, J.-R. (1890). Mollusques de l'Afrique équatoriale de Moguedouchou à Bagamoyo et de Bagamoyo au Tanganika. 1–229, pls 1–8. Book dated 1889, publication date 1890