Cicurina brevis

(Emerton, 1890)

Cicurina brevis is a small araneomorph distributed across northern North America. A 2024 study identified this species as a potential subnivium , exhibiting higher beneath seasonal snowpack in winter than during summer months. This seasonal activity pattern suggests to cold-weather environments, distinguishing it from typical summer-active forest floor spiders.

Pronunciation

How to pronounce Cicurina brevis: /tʃɪˈkjuːrɪnə ˈbrɛvɪs/

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Identification

Cicurina brevis can be distinguished from similar Cicurina by its documented presence in the subnivium during winter months, whereas congeneric species in the same study region were either absent or rare in winter . The species shows a reverse seasonal pattern compared to most forest floor , which are abundant in summer and scarce or in winter. Positive identification requires examination of genitalic by a arachnologist.

Habitat

Found in forest floor environments, with documented occurrence in the subnivium—the air space between soil surface and overlying snowpack—in northern temperate regions. The subnivium provides thermally buffered conditions with stable temperatures near 0°C, protected from extreme ambient temperature fluctuations.

Distribution

Recorded from Canada (Manitoba, Saskatchewan) and the United States (Vermont). GBIF distribution records indicate presence across northern North America, though precise range boundaries remain incompletely documented.

Seasonality

Active primarily during winter months beneath snowpack, with higher capture rates in subnivium than in summer forest floor collections. This represents a reversal of typical seasonality patterns. Summer activity appears reduced or possibly .

Behavior

Has been observed as an active in subnivium conditions during winter, coexisting with other cold-adapted including , , and . Movement rates in the subnivium are slowed by cold temperatures, with likely targeting similarly slowed or cold-immobilized .

Ecological Role

Identified as one of four probable subnivium in a New Hampshire study, suggesting a distinct ecological role in winter . As a in the subnivium, it contributes to and energy transfer in an otherwise seasonally depauperate environment. The subnivium , including C. brevis, may provide critical winter food resources for larger predators and early-season .

Similar Taxa

Cicurina madlaA congeneric cave-dwelling from Texas with similar -level , but restricted to cave systems and federally listed as endangered; differs in (permanent caves vs. seasonal subnivium) and geographic distribution (south-central USA vs. northern North America)
Other Cicurina species in the same study region were rare or absent in winter subnivium , whereas C. brevis dominated winter collections; precise differentiation requires examination of genitalic characters

More Details

Family placement note

-level of Cicurina has been unstable in taxonomic databases, with sources listing Cicurinidae, Dictynidae, or Hahniidae. The Catalogue of Life and recent treatments place C. brevis in Cicurinidae.

Climate vulnerability

As a probable subnivium , C. brevis potential decline from reduced winter snowpack due to climate warming. The subnivium's thermal buffering depends on consistent snow cover; without it, these would be exposed to lethal temperature fluctuations.