- family: Linyphiidae
- genus: Mermessus
- species: Mermessus agressus (Gertsch & Davis, 1937)
- species: Mermessus albulus (Zorsch & Crosby, 1934)
- species: Mermessus annamae (Gertsch & Davis, 1937)
- species: Mermessus antraeus (Crosby, 1926)
- species: Mermessus augustae (Crosby & Bishop, 1933)
- species: Mermessus augustalis (Crosby & Bishop, 1933)
- species: Mermessus avius (Millidge, 1987)
- species: Mermessus brevidentatus (Emerton, 1909)
- species: Mermessus bryantae (Ivie & Barrows, 1935)
- species: Mermessus caelebs (Millidge, 1987)
- species: Mermessus coahuilanus (Gertsch & Davis, 1940)
- species: Mermessus cognatus (Millidge, 1987)
- species: Mermessus colimus (Millidge, 1987)
- species: Mermessus comes (Millidge, 1987)
- species: Mermessus conexus (Millidge, 1987)
- species: Mermessus conjunctus (Millidge, 1991)
- species: Mermessus contortus (Emerton, 1882)
- species: Mermessus denticulatus (Banks, 1898)
- species: Mermessus dentiger O. P.-Cambridge, 1899
- species: Mermessus dentimandibulatus (Keyserling, 1886)
- species: Mermessus dominicus (Millidge, 1987)
- species: Mermessus dopainus (Chamberlin & Ivie, 1936)
- species: Mermessus entomologicus (Emerton, 1911)
- species: Mermessus estrellae (Millidge, 1987)
- species: Mermessus facetus (Millidge, 1987)
- species: Mermessus floridus (Millidge, 1987)
- species: Mermessus formosus (Millidge, 1987)
- species: Mermessus fractus (Millidge, 1987)
- species: Mermessus fradeorum (Berland, 1932)
- species: Mermessus fuscus (Millidge, 1987)
- species: Mermessus hebes (Millidge, 1991)
- species: Mermessus holdus (Chamberlin & Ivie, 1939)
- species: Mermessus hospita (Millidge, 1987)
- species: Mermessus ignobilis (Millidge, 1987)
- species: Mermessus imago (Millidge, 1987)
- species: Mermessus index (Emerton, 1914)
- species: Mermessus indicabilis (Crosby & Bishop, 1928)
- species: Mermessus inornatus (Ivie & Barrows, 1935)
- species: Mermessus insulsus (Millidge, 1991)
- species: Mermessus leoninus (Millidge, 1987)
- species: Mermessus libanus (Millidge, 1987)
- species: Mermessus lindrothi (Holm, 1960)
- species: Mermessus maculatus (Banks, 1892)
- species: Mermessus maderus (Millidge, 1987)
- species: Mermessus major (Millidge, 1987)
- species: Mermessus mediocris (Millidge, 1987)
- species: Mermessus medius (Millidge, 1987)
- species: Mermessus merus (Millidge, 1987)
- species: Mermessus mniarus (Crosby & Bishop, 1928)
- species: Mermessus modicus (Millidge, 1987)
- species: Mermessus montanus (Millidge, 1987)
- species: Mermessus monticola (Millidge, 1987)
- species: Mermessus moratus (Millidge, 1987)
- species: Mermessus naniwaensis (Oi, 1960)
- species: Mermessus nigrus (Millidge, 1991)
- species: Mermessus obscurus (Millidge, 1991)
- species: Mermessus orbus (Millidge, 1987)
- species: Mermessus ornatus (Millidge, 1987)
- species: Mermessus paludosus (Millidge, 1987)
- species: Mermessus paulus (Millidge, 1987)
- species: Mermessus perplexus (Millidge, 1987)
- species: Mermessus persimilis (Millidge, 1987)
- species: Mermessus pinicola (Millidge, 1987)
- species: Mermessus probus (Millidge, 1987)
- species: Mermessus proximus (Keyserling, 1886)
- species: Mermessus rapidulus (Bishop & Crosby, 1938)
- species: Mermessus singularis (Millidge, 1987)
- species: Mermessus socius (Chamberlin, 1948)
- species: Mermessus sodalis (Millidge, 1987)
- species: Mermessus solitus (Millidge, 1987)
- species: Mermessus solus (Millidge, 1987)
- species: Mermessus subantillanus (Millidge, 1987)
- species: Mermessus taibo (Chamberlin & Ivie, 1933)
- species: Mermessus tenuipalpis (Emerton, 1911)
- species: Mermessus tepejicanus (Gertsch & Davis, 1937)
- species: Mermessus tibialis (Millidge, 1987)
- species: Mermessus tlaxcalanus (Gertsch & Davis, 1937)
- species: Mermessus tridentatus (Emerton, 1882)
- species: Mermessus trilobatus (Emerton, 1882)
- species: Mermessus undulatus (Emerton, 1911)