Micrargus

Dahl, 1886

dwarf spiders

Species Guides

Micrargus longitarsus(dwarf spider)

Micrargus is a of dwarf spiders ( Linyphiidae) described by Friedrich Dahl in 1886. The genus contains seventeen recognized distributed across Europe, Asia, North America, and Africa. Several species form a distinct species group centered on M. herbigradus, characterized by specific male palpal and female epigynal structures. The genus exhibits considerable flexibility, with species ranging from lowland forests to alpine meadows and caves.

Pronunciation

How to pronounce Micrargus: //maɪˈkrɑːrɡəs//

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Identification

-level identification within Micrargus requires microscopic examination of genital structures. For the M. herbigradus species group, diagnostic characters include: male palpal organ (embolus shape, presence and position of spine, structure) and female epigynal seminal duct configuration. M. georgescuae is distinguished from by montane restriction and specific genitalic features. M. apertus shows the strongest forest association within the group.

Habitat

preferences vary markedly by . M. herbigradus occupies diverse habitats from xerothermic dry stands to periodically flooded forests and mires, with slight preference for moderately moist forested areas. M. apertus shows the highest forest affinity in the , primarily in lowland forests below 300 m elevation but extending to higher altitudes; recorded from sand quarries, agricultural crops, caves, and subalpine bogs. M. georgescuae is restricted to montane habitats above 650 m elevation, including spruce, alder, and beech forests, dwarf pine shrublands, and meadows up to 1850 m.

Distribution

Seventeen distributed across temperate regions: Europe (widespread including France, Germany, Switzerland, Austria, Poland, Scandinavia, Russia to Kazakhstan), Asia (Turkey, Caucasus, China, Japan including Hokkaido), North America (USA including Alaska, Canada), and Africa (Uganda, Canary Islands). M. herbigradus is the most widespread, occurring from Europe through Russia to China and Japan.

Seasonality

of at least three European (M. herbigradus, M. apertus, M. georgescuae) occur year-round with peak abundance in May and June.