Land gastropods include:
Helicinidae •
Helicina nemoralis Guppy, 1866 •
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. •
Mesembrinus aureolus (Guppy, 1866) Endemic to Trinidad •
Mesembrinus broadwayi (E.A. Smith, 1896) Endemic to Trinidad •
Mesembrinus imperfectus (Guppy, 1866) Endemic to Trinidad •
Mesembrinus mossi (E.A. Smith, 1896) Endemic to Trinidad •
Mesembrinus rawsoni (Guppy, 1871) Endemic to Tobago •
Mesembrinus 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==