Article · Wikipedia archive · Last revised Jun 26, 2026

Trochorbis

Trochorbis is a genus of freshwater snails in the family Planorbidae. The type species is Trochorbis trochoideus.

Last revised
Jun 26, 2026
Read time
≈ 2 min
Length
456 w
Citations
14
Source
Wikipedia ↗
Trochorbis
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Superorder: Hygrophila
Family: Planorbidae
Genus: Trochorbis
W. H. Benson, 18551
Type species
Planorbis trochoideus W.H. Benson, 1836
Synonyms2
  • Planorbis (Trochorbis) W. H. Benson, 1855
  • Segmentina (Trochorbis) W. H. Benson, 1855; superseded rank

Trochorbis is a genus of freshwater snails in the family Planorbidae. The type species is Trochorbis trochoideus.

Taxonomy

This genus was orignally described as a subgenus of Planorbis, named Planorbis (Trochorbis), by William Henry Benson in 1855.1 Later authors considered Trochorbis to be synonymous with the genus Segmentina,345 sometimes displaying it as the subgenus Planorbis (Segmentina).67 In 1945, Frank C. Baker restated the group as it currently appears: its own independent genus within the subfamily Segmentininae (now tribe Segmentinini).8 The type species is Trochorbis trochoideus.28

The genus is hypothesized to be closely related to the genus Polypylis due to similar shell characteristics.8

Description

Species of Trochorbis are distinguished by a disc-shaped shell where the final (body) whorl covers most of the other whorls.9

Species

Species within this genus include:2

One species remains uncertain (incertae sedis):

  • Trochorbis anastasiae Izzatullaev, 1973
References

References

  1. Benson, W. H. (1855). "Chusan shells". The Journal of the Asiatic Society of Bengal. 24 (2): 126. ISSN 0368-1068. LCCN 08000088. OCLC 1824093 – via Biodiversity Heritage Library.
  2. Vinarski, Maxim (2022). "Trochorbis W. H. Benson, 1855". WoRMS. World Register of Marine Species.
  3. Dall, W. H. (1906). "Note on some forgotten mollusk-names". The Nautilus (journal). 19 (9): 105. ISSN 0028-1344. LCCN sf80000648. OCLC 1759527 – via Biodiversity Heritage Library.
  4. Kennard, A. S.; Woodward, B. B. (1926). Synonymy of the British non-marine Mollusca (Recent and post-tertiary). pp. 89–90. doi:10.5962/bhl.title.8325. OCLC 6389905 – via Biodiversity Heritage Library.
  5. Germain, L. (1923). "Catalogue of the Planorbidae in the Indian Museum (Natural History), Calcutta". Records of the Indian Museum (in French). 21 (3): 175. ISSN 0375-099X. OCLC 1427183 – via Biodiversity Heritage Library.
  6. Preston, H. B. (1915). Shipley, A. E.; Marshall, G. A. K. (eds.). The fauna of British India including Ceylon and Burma. London: Taylor & Francis. p. 125. doi:10.5962/bhl.title.100762.
  7. Geoffrey, N. (1878). Hand list of Mollusca in the Indian Museum, Calcutta. Vol. 1. Calcutta. p. 246. doi:10.5962/bhl.title.54249. OCLC 18790669 – via Biodiversity Heritage Library.{{cite book}}: CS1 maint: location missing publisher (link)
  8. Baker, F. C. (1945). von Cleave, H. J. (ed.). The molluscan family Planorbidae. University of Illinois Press. pp. 108–109. doi:10.5962/bhl.title.7026. ISBN 978-1021493705. LCCN a45002301. OCLC 843977. Archived from the original on 2 July 2008. {{cite book}}: ISBN / Date incompatibility (help)
  9. Hubendick, B. (1955). "Phylogeny in the Planorbidae". Transactions of the Zoological Society of London. 28: 515. doi:10.1111/j.1096-3642.1955.tb00004.x.
  • Bank, R. A. (2017). Classification of the Recent freshwater/brackish Gastropoda of the World. Last update: January 24th, 2018. OpenAccess publication.