Linyphiidae: Porrhomma Simon, 1884

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1
Femur dorsally without spines

  2  

- Femur I-II dorsally with one spine at least

  3  

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. P.-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

3
(1)

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Metatarsus I-IV with dorsal spine; male pedipalp and epigyne as fig.

Porrhomma errans (Blackwall, 1841)

- Metatarsus without dorsal spine

  4  

4
(3)
Males

  5  

- Females

  12  

5
(4)
Embolus slender, finger- to sickle-shaped

  9  

- Embolus claw-shaped; velum stepped

  6  

6
(5)

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Upper apophysis short, weakly sclerotised

Porrhomma egeria Simon, 1884

female

- Upper apophysis beak-shaped

  7  

7
(6)

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Upper apophysis dorsally concave, upwardly bent

Porrhomma campbelli F. O. P.-Cambridge, 1894

female

- Different

  8  

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. P.-Cambridge, 1871)

female

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Opisthosoma pale; embolic division of male pedipalp as fig.; prosoma width 0.75-0.95 mm

Porrhomma microps (Roewer, 1931)

female

9
(5)

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Embolus ± straight

Porrhomma pallidum Jackson, 1913

female

- Embolus sickle-shaped

  10  

10
(9)
Eyes strongly reduced; trichobothria metatarsus I: 0.5-0.7; femur I 1.1-1.3 x prosoma length

  1  

- Eyes normal; trichobothria metatarsus I: < 0.5; femur I < prosoma length

  11  

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)

female

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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)

female

-

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Prosoma width 0.8 mm; femur I 0.95 mm

Porrhomma microcavense Wunderlich, 1990

female

-

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Embolic division as fig; eyes reduced

Porrhomma rosenhaueri (L. Koch, 1872)

female

12
(4)
Entrance ducts short; receptaculum seminis near median line

  13  

- Entrance ducts longer; receptaculum seminis situated laterally

  15  

13
(12)

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Finger-shaped receptaculum seminis directed inwards; eyes normal to reduced

Porrhomma campbelli F. O. P.-Cambridge, 1894

male

- Finger-shaped receptaculum seminis directed outwards

  14  

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

male

-

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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

male

15
(12)
Entrance ducts with large diameter; turn back part bullous

  16  

- Entrance ducts narrower

  17  

16
(15)

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Prosoma width 0.6-0.7 mm; eyes well developed; opisthosoma blackish; epigyne as fig.

Porrhomma microphthalmum (O. P.-Cambridge, 1871)

male

-

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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)

male

17
(15)
Eyes strongly reduced; Trichobothria Metatarsus I 0.5-0.7; femur I > prosoma length

  1  

- Eyes normal; Trichobothria Metatarsus I < 0.5; femur I < prosoma length

  18  

18
(17)

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Prosoma width 0.62-0.68 mm; opisthosoma blackish; epigyne/vulva as fig.

Porrhomma pygmaeum (Blackwall, 1834)

male

- Prosoma width 0.72 mm and wider; opisthosoma middle grey to light grey

  19  

19
(18)

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Prosoma width 0.76-0.87 mm; epigyne/vulva as fig.

Porrhomma convexum (Westring, 1851)

male

-

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Prosoma width 0.72 mm

Porrhomma microcavense Wunderlich, 1990

male

-

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Entrance ducts ± rounded; eyes reduced

Porrhomma rosenhaueri (L. Koch, 1872)

male

Further taxa

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1. Porrhomma boreale (Banks, 1899)

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2. Porrhomma cambridgei Merrett, 1994

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3. Porrhomma profundum M. Dahl, 1939