In synonymy:
Hemiphantes Strand, 1901 = Porrhomma Simon, 1884 (Holm, 1944: 130, by synonymy of the type species)
Opistoxys Simon, 1884 = Porrhomma Simon, 1884 (Thaler, 1975a: 142)
Transferred to other genera:
Porrhomma antarcticum Hickman, 1939 -- see Neomaso
Porrhomma boreum (L. Koch, 1879) -- see Collinsia
Porrhomma calcaratum (Keyserling, 1886) -- see Ceratinopsis
Porrhomma contritum (O. Pickard-Cambridge, 1873) -- see Poeciloneta
Porrhomma corsicum Simon, 1910 -- see Centromerus
Porrhomma fuegianum (Tullgren, 1901) -- see Laminacauda
Porrhomma kisoense Oi, 1960 -- see Microbathyphantes
Porrhomma macrochelis (Emerton, 1917) -- see Macrargus
Porrhomma parasiticum (Westring, 1851) -- see Thyreosthenius
Porrhomma pedemontanum Gozo, 1908 -- see Troglohyphantes
Porrhomma provocans (O. Pickard-Cambridge, 1877) -- see Collinsia
Porrhomma rufipes (Blackwall, 1833) -- see Robertus
Porrhomma tateyamaense Oi, 1960 -- see Bathyphantes
In synonymy:
Porrhomma acutum (Simon, 1884) = Porrhomma microphthalmum O. Pickard-Cambridge, 1871 (Thaler, 1975a: 142)
Porrhomma desolatum (L. Koch, 1879, T from Linyphia) = Porrhomma montanum Jackson, 1913 (Holm, 1973: 97, who suppressed the older name)
Porrhomma emertoni Roewer, 1942 = Porrhomma cavernicola Keyserling, 1886 (Miller, 2005b: 430)
Porrhomma fagei Miller & Kratochvíl, 1940 = Porrhomma campbelli F. O. Pickard-Cambridge, 1894 (Heimer & Nentwig, 1991: 238)
Porrhomma formosum (L. Koch, 1879, T from Erigone) = Porrhomma montanum Jackson, 1913 (Holm, 1973: 97, who suppressed the older name)
Porrhomma gertschi Hackman, 1954 = Porrhomma terrestre Emerton, 1882 (Růžička, 2018: 63)
Porrhomma hakusanense Oi, 1964 = Porrhomma montanum Jackson, 1913 (Ono, Matsuda & Saito, 2009: 332, sub P. hebescens)
Porrhomma hebescens (L. Koch, 1879, T from Bathyphantes) = Porrhomma montanum Jackson, 1913 (Holm, 1973: 97, who suppressed the older name)
Porrhomma kolosvaryi Kratochvíl, 1934 = Porrhomma microps Roewer, 1931 (Thaler, 1967: 171)
Porrhomma kulczynskii Starega, 1974 = Porrhomma boreale Banks, 1899 (Tanasevitch, 2013b: 184)
Porrhomma lativelum Tretzel, 1956 = Porrhomma microps Roewer, 1931 (Růžička, 2009: 1089)
Porrhomma moderatum Silhavý, 1958 = Porrhomma egeria Simon, 1884 (Heimer & Nentwig, 1991: 238)
Porrhomma moravicum Miller & Kratochvíl, 1940 = Porrhomma egeria Simon, 1884 (Bourne, 1977a: 89)
Porrhomma myops Simon, 1884 = Porrhomma rosenhaueri L. Koch, 1872 (Růžička, 2018: 58)
Porrhomma norvegicum Strand, 1901 = Porrhomma convexum Westring, 1851 (Holm, 1944: 130)
Porrhomma nunamo Holm, 1970 = Porrhomma boreale Banks, 1899 (Eskov, 1988e: 105)
Porrhomma obambulatum Kritscher, 1969 = Porrhomma egeria Simon, 1884 (Bourne, 1977a: 89)
Porrhomma ocella Chamberlin & Ivie, 1943 = Porrhomma convexum Westring, 1851 (Růžička, 2018: 24)
Porrhomma omissum Miller, 1971 = Porrhomma egeria Simon, 1884 (Růžička, 2018: 27)
Porrhomma pallidum affinis Miller & Kratochvíl, 1940 = Porrhomma pallidum Jackson, 1913 (Růžička, 2018: 50)
Porrhomma proserpina (Simon, 1872) = Porrhomma convexum Westring, 1851 (Holm, 1944: 133)
Porrhomma pusiolum (Fickert, 1875, T from Bathyphantes) = Porrhomma convexum Westring, 1851 (Rozwałka, 2010a: 317)
Porrhomma rosenhaueri hungaricum Loksa, 1970 = Porrhomma profundum M. Dahl, 1939 (Thaler & Plachter, 1983: 260)
Porrhomma sodonta (Chamberlin, 1949) = Porrhomma convexum Westring, 1851 (Růžička, 2018: 24)
Porrhomma spipolae Caporiacco, 1949 = Porrhomma microps Roewer, 1931 (Růžička, 2009: 1089)
Porrhomma strandi (Charitonov, 1928, T from Bathyphantes, sub B. articus) = Porrhomma pygmaeum Blackwall, 1834 (Holm, 1944: 130)
Porrhomma thorelli (Herman, 1879) = Porrhomma convexum Westring, 1851 (Fage, 1931: 147, 158, sub P. proserpina)
Homonym replaced:
Porrhomma oblongum (O. Pickard-Cambridge, 1871) -- see Porrhomma cambridgei Merrett, 1994
Nomina dubia:
Porrhomma calypso (Bertkau, in Förster & Bertkau, 1883: 256, pl. 3, f. 7, f, Germany, originally in Linyphia) -- Thaler, 1968: 384
Porrhomma fonsfrigidum Drensky, 1929: 38, 71, pl. 4, f. 1-3 (mf, North Macedonia) -- Thaler, 1968: 384
Porrhomma inconspicuum (O. Pickard-Cambridge, 1873a: 751, pl. 65, f. 5a-d (m, Germany, originally in Erigone) -- Thaler, 1968: 384
Porrhomma indecorum Simon, 1910a: 56 (f, Algeria) -- Růžička, 2018: 65
Porrhomma jacksoni Simon, 1926: 464, 527 (f, France) -- Thaler, 1968: 384
Porrhomma marphaense Wunderlich, 1983a: 230, f. 25-26 (f, Nepal) -- Růžička, 2018: 65
Porrhomma rasum (O. Pickard-Cambridge, 1879f: 343, pl. 17, f. 1 (m, Czechia, originally in Neriene) -- Thaler, 1968: 384
Porrhomma subterraneum Simon, 1884a: 359 (j, France) -- Růžička, 2018: 66
Porrhomma umbraticum (L. Koch, 1881b: 55, pl. 2, f. 7, m, Germany, originally in Linyphia) -- Thaler, 1968: 384