Linyphiidae: Porrhomma Simon, 1884
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| 1 |
Femur dorsally without spines | |||||||||||||||||||
| - | Femur I-II dorsally with one spine at least | |||||||||||||||||||
| 2 (1)
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Male pedipalp as fig., upper apophysis beak-shaped; vulva with long entrance ducts; receptaculum seminis situated laterally Porrhomma oblitum (O. Pickard-Cambridge, 1871) |
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Male pedipalp: upper apophysis dorsally concave, quickly tapering; vulva with shorter entrance ducts; receptaculum seminis situated medially Porrhomma montanum Jackson, 1913 |
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| 3 (1)
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Metatarsus I-IV with dorsal spine; male pedipalp and epigyne as fig. Porrhomma errans (Blackwall, 1841) |
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| - | Metatarsus without dorsal spine | |||||||||||||||||||
| 4 (3) |
Males | |||||||||||||||||||
| - | Females | |||||||||||||||||||
| 5 (4) |
Embolus slender, finger- to sickle-shaped |
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| - | Embolus claw-shaped; velum stepped |
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| 6 (5)
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Upper apophysis short, weakly sclerotised Porrhomma egeria Simon, 1884
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| - | Upper apophysis beak-shaped | |||||||||||||||||||
| 7 (6)
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Upper apophysis dorsally concave, upwardly bent Porrhomma campbelli F. O. Pickard-Cambridge, 1894
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| - | Different | |||||||||||||||||||
| 8 (7)
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Opisthosoma blackish; embolic division of pedipalp and eyes as fig.; prosoma width 0.6-0.72 mm Porrhomma microphthalmum (O. Pickard-Cambridge, 1871)
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Opisthosoma pale; embolic division of male pedipalp as fig.; prosoma width 0.75-0.95 mm Porrhomma microps (Roewer, 1931)
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| 9 (5)
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Embolus ± straight Porrhomma pallidum Jackson, 1913
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| - | Embolus sickle-shaped | |||||||||||||||||||
| 10 (9) |
Eyes strongly reduced; trichobothria metatarsus I: 0.5-0.7; femur I 1.1-1.3 x prosoma length | |||||||||||||||||||
| - | Eyes normal; trichobothria metatarsus I: < 0.5; femur I < prosoma length | |||||||||||||||||||
| 11 (10)
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Three very similar species: prosoma width 0.64-0.7 mm; femur I 0.75 mm; embolic division of pedipalp as fig.; cymbium length 0.28-0.31 mm Porrhomma pygmaeum (Blackwall, 1834)
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Prosoma width 0.79-0.92 mm; femur I 0.99-1.07 mm; embolic division and embolus as fig.; cymbium length 0.37-0.39 mm Porrhomma convexum (Westring, 1851)
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Prosoma width 0.8 mm; femur I 0.95 mm Porrhomma microcavense Wunderlich, 1990
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Embolic division as fig; eyes reduced Porrhomma rosenhaueri (L. Koch, 1872)
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| 12 (4) |
Entrance ducts short; receptaculum seminis near median line | |||||||||||||||||||
| - | Entrance ducts longer; receptaculum seminis situated laterally | |||||||||||||||||||
| 13 (12)
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Finger-shaped receptaculum seminis directed inwards; eyes normal to reduced Porrhomma campbelli F. O. Pickard-Cambridge, 1894
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| - | Finger-shaped receptaculum seminis directed outwards | |||||||||||||||||||
| 14 (13)
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Prosoma width 0.6-0.7 mm; distance posterior median eyes to posterior lateral eyes 1.5-2.0 diameter; eyes normal; epigyne as fig. Porrhomma pallidum Jackson, 1913
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Prosoma width 0.77-0.84 mm; distance posterior median eyes to posterior lateral eyes 2.4-5.4 diameter; eyes reduced; epigyne as fig. Porrhomma egeria Simon, 1884
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| 15 (12) |
Entrance ducts with large diameter; turn back part bullous |
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| - | Entrance ducts narrower | |||||||||||||||||||
| 16 (15)
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Prosoma width 0.6-0.7 mm; eyes well developed; opisthosoma blackish; epigyne as fig. Porrhomma microphthalmum (O. Pickard-Cambridge, 1871)
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Prosoma width 0.75-0.95 mm; eyes small to reduced; opisthosoma pale; epigyne/vulva as fig. Porrhomma microps (Roewer, 1931)
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| 17 (15) |
Eyes strongly reduced; Trichobothria Metatarsus I 0.5-0.7; femur I > prosoma length | |||||||||||||||||||
| - | Eyes normal; Trichobothria Metatarsus I < 0.5; femur I < prosoma length | |||||||||||||||||||
| 18 (17)
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Prosoma width 0.62-0.68 mm; opisthosoma blackish; epigyne/vulva as fig. Porrhomma pygmaeum (Blackwall, 1834)
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| - | Prosoma width 0.72 mm and wider; opisthosoma middle grey to light grey | |||||||||||||||||||
| 19 (18)
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Prosoma width 0.76-0.87 mm; epigyne/vulva as fig. Porrhomma convexum (Westring, 1851)
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Prosoma width 0.72 mm Porrhomma microcavense Wunderlich, 1990
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Entrance ducts ± rounded; eyes reduced Porrhomma rosenhaueri (L. Koch, 1872)
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Pedipalp, ventral view
Epigyne
Further taxa
| 1. Porrhomma boreale (Banks, 1899) |
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| 2. Porrhomma cambridgei Merrett, 1994 |
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| 3. Porrhomma frasassianum Weiss & Sarbu, 2021 |
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| 4. Porrhomma profundum M. Dahl, 1939 |
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