The non-marine molluscs of the republic of Trinidad and Tobago (which comprises two West Indian islands) are a part of the molluscan fauna of Trinidad and Tobago, part of the Natural history of Trinidad and Tobago.
Starting in the 1860s, the terrestrial and freshwater molluscs of Trinidad and Tobago have been fairly well studied. Thomas Bland published the first paper mentioning terrestrial molluscs in 1861. Robert John Lechmere Guppy discovered and identified many more species from 1864 onwards, and along with Edgar Albert Smith was responsible for the earliest comprehensive species lists. The list here includes all the non-marine mollusks found in Trinidad and Tobago's ecosystem including native, introduced and invasive species alike.
Freshwater gastropods
Freshwater gastropods include:
Ampullariidae
Marisa cornuarietis (Linnaeus, 1758) Pomacea glauca (Linné, 1758) Pomacea urceus (Müller, 1774)
Ancylidae
Hebetancylus excentricus (Morelet, 1851)
Hydrobiidae
Pyrgophorus parvulus (Guilding, 1828)
Physidae
Physella cubensis (Pfeiffer, 1839)
Planorbidae
Tropicorbis pallidus (C.B. Adams, 1846)
Thiaridae
Melanoides tuberculata (O. F. Müller, 1774)
Land gastropods
Land gastropods include:
Helicinidae
Helicina nemoralis Guppy, 1866
Helicina dysoni (L. Pfeiffer, 1849) Lucidella ignicoma (Guppy, 1868) Endemic to Trinidad Lucidella lirata (L. Pfeiffer, 1847)
Neocyclotidae
Aperostoma translucidum trinitense (Guppy, 1864) Neocyclotus rugatus (Guppy, 1864)
Diplommatinidae
Adelopoma occidentale (Guppy, 1872)
Annulariidae
Halotudora aripensis (Guppy, 1864) Endemic to Trinidad
Truncatellidae
Truncatella reclusa (Guppy, 1871) Endemic to Trinidad
Veronicellidae
Diplosolenodea bielenbergi (Semper, 1885) Sarasinula plebeia (Fischer, 1868)
Achatinidae
Lissachatina fulica (Bowdich, 1822) Invasive
Allopeas gracile (Hutton, 1834) Allopeas micra (d’Orbigny, 1835) Beckianum beckianum (L. Pfeiffer, 1846) Leptopeas simplex (Guppy, 1868) Leptinaria unilamellata (d’Orbigny, 1835) Leptinaria urichi (E.A. Smith, 1896) Endemic to Trinidad Stenogyra octogyra (L. Pfeiffer, 1856) Subulina octona (Bruguière, 1798)
Ferussaciidae
Karolus consobrinus (d’Orbigny, 1841)
Streptaxidae
Gulella bicolor (Hutton, 1834) Introduced
Streptartemon glaber (L. Pfeiffer, 1850) Streptostele musaecola (Morelet, 1860) Introduced
Succineidae
Succinea sp. Omalonyx unguis (d'Orbigny, 1836)
Vertiginidae
Bothriopupa conoidea (L. Pfeiffer, 1853) Bothriopupa tenuidens (C.B. Adams, 1845) Sterkia eyriesii (Drouet, 1859)
Gastrocoptidae
Gastrocopta barbadensis (L. Pfeiffer, 1853) Gastrocopta iheringi (Suter, 1900) Gastrocopta pellucida (L. Pfeiffer, 1840) Gastrocopta servilis riisei (L. Pfeiffer, 1852) Gastrocopta rupicola marginalba (L. Pfeiffer, 1840) Gastrocopta geminidens (Pilsbry, 1917)
Valloniidae
Pupisoma dioscoricola (C. B. Adams, 1845)
Amphibulimidae
Plekocheilus glaber (Gmelin, 1791)
Bulimulidae
Bulimulus sp. Drymaeus aureolus (Guppy, 1866) Endemic to Trinidad Drymaeus broadwayi (E.A. Smith, 1896) Endemic to Trinidad Drymaeus imperfectus (Guppy, 1866) Endemic to Trinidad Drymaeus mossi (E.A. Smith, 1896) Endemic to Trinidad Drymaeus rawsoni (Guppy, 1871) Endemic to Tobago Drymaeus vincentinus (L. Pfeiffer, 1846) Protoglyptus pilosus (Guppy, 1871)
Orthalicidae
Orthalicus undatus (Bruguière, 1792)
Simpulopsidae
Simpulopsis corrugata Guppy, 1866
Urocoptidae
Brachypodella trinitaria (L. Pfeiffer, 1860) Brachypodella oropuchensis Spence (Possible synonym of above)
Scolodontidae
Happia guildingi (Bland, 1865) Miradiscops implicans (Guppy, 1868) Miradiscops lunti (E.A. Smith, 1898) Systrophia alicea (Guppy, 1871) Tamayoa decolorata (Drouët, 1859) Tamayoa trinitaria (E.A. Smith, 1898)
Gastrodontidae
Pseudohyalina umbratilis (Guppy, 1868)
Philomycidae
Pallifera sp.
Euconulidae
Guppya gundlachi (L. Pfeiffer, 1840) Habroconus ernsti (Jousseaume, 1889) Habroconus cassiquiensis (L. Pfeiffer, 1853)
Helicarionidae
Ovachlamys fulgens (Gude, 1900) Introduced
Strophocheilidae
Megalobulimus oblongus (Müller, 1774) Megalobulimus oblongus var. tobagoensis (Pilsbry, 1895)
Charopidae
Radioconus bactricola (Guppy, 1868) Radiodiscus hollidayi Rutherford, 2020
Trichodisccinidae
Trichodiscina coactiliata (Férussac, 1838)