Linyphiidae: Micrargus

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1
Males

  2  

- Females

  7  

2
(1)
Tibial apophysis with long, rounded process, with tubercles (four similar species, difficult to distinguish)

  3  

speciesimage
male Tibial apophysis
(Millidge 1975b)
- Tibial apophysis without long process

  6  

3
(2)
A large, long tooth on embolic base

  4  

- Tooth on embolic base angled or hardly developed

  5  

4
(3)

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Tooth on embolic base tapering into a tip, surrounding membranous border large; tibial apophysis as fig.

Micrargus apertus (O. P.-Cambridge, 1871)

female

speciesimage
male Pedipalp
(Roberts 1987)
speciesimage
male Bulbus
(Millidge 1975b)
speciesimage
male Embolus
(Millidge 1975b)
speciesimage
male Embolic tooth
(Relys & Weiss 1997)
speciesimage
male Prosoma, lateral view
(Roberts 1987)
-

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Tooth on embolic base with rounded tip, surrounding membranous border small; tibial apophysis as fig.

Micrargus georgescuae Millidge, 1976

female

speciesimage
male Bulbus
(Millidge 1975b)
speciesimage
male Embolus
(Millidge 1975b)
speciesimage
male Embolic tooth
(Relys & Weiss 1997)
speciesimage
male Tibial apophysis
(Millidge 1975b)
5
(3)

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Tooth on embolic base weakly developed, surrounding border robust; tibial apophysis as fig.

Micrargus herbigradus (Blackwall, 1854)

female

speciesimage
male Pedipalp
(Roberts 1987)
speciesimage
male Pedipalp
(Locket & Millidge 1953)
speciesimage
male Embolus
(Millidge 1975b)
speciesimage
male Embolic tooth
(Relys & Weiss 1997)
speciesimage
male Palpal tibia
(Roberts 1987)
speciesimage
male Tibial apophysis
(Locket & Millidge 1953)
speciesimage
male Prosoma, lateral view
(Roberts 1987)
-

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Tooth on embolic base angled, surrounding border weakly developed

Micrargus alpinus Relys & Weiss, 1997

female

speciesimage
male Embolic tooth
(Relys & Weiss 1997)
6
(2)

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Paracymbium with long, basally directed process

Micrargus subaequalis (Westring, 1851)

female

speciesimage
male Pedipalp
(Wiehle 1960a)
speciesimage
male Pedipalp
(Wiehle 1960a)
speciesimage
male Pedipalp
(Roberts 1987)
speciesimage
male Pedipalp
(Locket & Millidge 1953)
speciesimage
male Prosoma, lateral view
(Roberts 1987)
-

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Paracymbium with short, basally directed process

Micrargus laudatus (O. P.-Cambridge, 1881)

female

speciesimage
male Pedipalp
(Wiehle 1963b)
speciesimage
male Pedipalp
(Roberts 1987)
speciesimage
male Pedipalp
(Wiehle 1963b)
speciesimage
male Pedipalp
(Locket & Millidge 1953)
speciesimage
male Tibial apophysis
(Locket & Millidge 1953)
7
(1)
Anterior epigynal margin backwardly tapering into a tip

  8  

speciesimage
female Epigyne
(Wiehle 1960a)
speciesimage
female Epigyne
(Wiehle 1963b)
- Anterior epigynal margin very broadly bulged and directed backwardly

  9  

8
(7)

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Epigyne anteriorly distinctly wider than posteriorly

Micrargus subaequalis (Westring, 1851)

male

speciesimage
female Epigyne
(Wiehle 1960a)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Locket & Millidge 1953)
speciesimage
female Vulva
(Wiehle 1960a)
speciesimage
female Vulva, dorsal view
(Løvbrekke unpubl.)
-

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Epigyne anteriorly slightly narrower than posteriorly

Micrargus laudatus (O. P.-Cambridge, 1881)

male

speciesimage
female Epigyne
(Wiehle 1963b)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Locket & Millidge 1953)
speciesimage
female Vulva
(Wiehle 1963b)
9
(7)

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Posterior border of anterior epigynal margin straight

Micrargus georgescuae Millidge, 1976

male

speciesimage
female Epigyne
(Millidge 1975b)
speciesimage
female Vulva, dorsal view
(Millidge 1975b)
speciesimage
female Vulva, ventral view
(Millidge 1975b)
- Different

  10  

10
(9)

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Epigyne with distinct hump in lateral view

Micrargus alpinus Relys & Weiss, 1997

male

speciesimage
female Epigyne, lateral view
(Relys & Weiss 1997)
speciesimage
female Vulva, dorsal view
(Relys & Weiss 1997)
- Different

  11  

11
(10)

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Vulva as fig.

Micrargus apertus (O. P.-Cambridge, 1871)

male

speciesimage
female Epigyne
(Millidge 1975b)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne, lateral view
(Løvbrekke unpubl.)
speciesimage
female Vulva
(Millidge 1975b)
speciesimage
female Vulva
(Roberts 1987)
speciesimage
female Vulva
(Roberts 1987)
speciesimage
female Vulva, dorsal view
(Løvbrekke unpubl.)
-

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Epigyne and vulva as figs.

Micrargus herbigradus (Blackwall, 1854)

male

speciesimage
female Epigyne
(Millidge 1975b)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Roberts 1987)
speciesimage
female Epigyne
(Locket & Millidge 1953)
speciesimage
female Vulva, ventral view
(Millidge 1975a)
speciesimage
female Vulva, dorsal view
(Millidge 1975b)
speciesimage
female Vulva
(Roberts 1987)
speciesimage
female Vulva
(Roberts 1987)
Further taxa

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1. Micrargus cupidon (Simon, 1913)

speciesimage
male Palpal tibia
(Simon 1926)
speciesimage
male Eyes, dorsal view
(Simon 1926)
speciesimage
female Epigyne
(Simon 1926)

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2. Micrargus dilutus (Denis, 1948)

speciesimage
female Epigyne, ventral view
(Denis 1948b)
speciesimage
female Prosoma, lateral view
(Denis 1948b)
speciesimage
female Sternum
(Denis 1948b)

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3. Micrargus dissimilis Denis, 1950

speciesimage
female Epigyne, ventral view
(Denis 1950d)
speciesimage
female Prosoma, lateral view
(Denis 1950d)

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4. Micrargus pervicax (Denis, 1947)

speciesimage
male Pedipalp, retrolateral view
(Wunderlich 2008d)
speciesimage
male Pedipalp, prolateral view
(Wunderlich 2008d)
speciesimage
male Palpal tibia, dorsal view
(Wunderlich 2008d)
speciesimage
male Prosoma, lateral view
(Wunderlich 2008d)
speciesimage
female Epigyne, ventral view
(Wunderlich 2008d)
speciesimage
female Vulva, dorsal view
(Wunderlich 2008d)