# Rachis (gastropod)

Rachis is a genus of air-breathing land snails, terrestrial pulmonate gastropod molluscs in the family Cerastidae.
This genus is also spelled as “Rhachis” as a synonym. 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.

## 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)
* Rachis nigrilineata (Reeve, 1849)
* Rachis obeliscus C. R. Boettger, 1913
* Rachis pachistoma Bourguignat, 1890
* Rachis punctata (Anton, 1838)
* Rachis stahlbergi C. R. Boettger, 1913
* Rachis tulearensis Fischer-Piette, 1964
* 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 bloyeti Bourguignat, 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* Rachis braunsii (E. von Martens, 1869): synonym of Rhachistia braunsii (E. von Martens, 1869) (superseded combination)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 erlangeri Kobelt, 1910: synonym of Rhachistia erlangeri (Kobelt, 1910) (unaccepted combination)
* Rachis fagotianus: synonym of Rachis fagotiana (Ancey, 1885) (incorrect grammatical agreement of specific epithet)
* Rachis hieroglyphicus Preston, 1910: synonym of Rachis hieroglyphica Preston, 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 jouberti Bourguignat, 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 moluensis Kobelt, 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): 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 rorkorensis Kobelt, 1910: synonym of Rhachistia rorkorensis (Kobelt, 1910)
* Rachis succincta (E. von Martens, 1879): synonym of Rhachistia braunsii (E. von Martens, 1869) (junior synonym)
* Rachis turricula Preston, 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 vicinus Preston, 1910: synonym of Rhachistia chiradzuluensis (E.A. Smith, 1899) (junior synonym)
* Rachis virginea Preston, 1911: synonym of Rhachistia chiradzuluensis var. virginea (Preston, 1911) (original combination)