List of non-marine molluscs of Trinidad and Tobago

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)

Thysanophoridae
 * Lyroconus plagioptycha (Shuttleworth, 1854)

Freshwater bivalves
Freshwater bivalves include: Mycetopodidae
 * Anodontites leotaudi (Guppy, 1864)
 * Mycetopoda siliquosa (Spix, 1827)

Sphaeriidae (=Pisidiidae)
 * Pisidium punctiferum (Guppy, 1867)
 * Eupera cubensis (Prime, 1865)