Nesticidae
Simon, 1894
cave cobweb spiders, scaffold web spiders
Genus Guides
3Nesticidae is a of spiders closely allied with Theridiidae (tangle web spiders), distinguished by a comb of serrated bristles on the hind used to pull silk bands from the . The family contains approximately 15 and 280 , with many species associated with caves, overhangs, and subterranean . Members show varying degrees of troglomorphic , from fully cave-adapted troglobionts to surface-dwelling forms. The genus Nesticus, the type genus, has a global distribution and has undergone extensive radiation in montane regions.
Pronunciation
How to pronounce Nesticidae: //nɛˈstɪsɪˌdiː//
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Identification
Distinguished from similar primarily by the presence of the serrated bristle comb on the hind used for silk manipulation. Differs from Theridiidae in ecological preferences (many Nesticidae are cave-associated) and subtle morphological details of arrangement and genitalia. Cave-dwelling often show troglomorphic traits: elongated appendages, reduced pigmentation, and reduced eyes. Identification to species level requires examination of genitalia ( in females, in males) and often molecular data.
Images
Habitat
Highly diverse: includes caves, abandoned mines, subterranean voids, rock overhangs, forest litter, grasslands, and under stones. Many are troglobionts (exclusively cave-dwelling), while others are troglophiles (facultative cave-dwellers) or surface-dwelling. Cave-dwelling species occupy limestone caves, lava tubes, and other karst formations. Surface-dwelling species occur in temperate and tropical terrestrial including leaf litter and rocky substrates.
Distribution
but with notable gaps: present on all continents except absent from Siberia, Central Asia, Northern and Southern Africa, and high-latitude regions. Major diversity centers include East Asia (China, Japan), the southern Appalachian Mountains (USA), the Alps, Madagascar, and the Iberian Peninsula. The Nesticus shows extensive short-range in montane regions.
Behavior
Construct scaffold webs using silk pulled with the specialized tarsal comb. Web architecture varies by —cave-dwelling build reduced webs in dark zones, while surface species construct more extensive snares. Some cave-dwelling species show high site fidelity to specific microhabitats within cave systems.
Ecological Role
in cave and surface ; cave-dwelling may serve as conservation sentinels due to their sensitivity to disturbance. Some species proposed as umbrella species for protection of cave-adapted .
Human Relevance
Subject of biospeleological research and conservation attention due to high and vulnerability of cave-dwelling . Some species threatened by destruction, pollution, and tourism impacts. Taxonomically significant as a model group for studying speciation in habitat-specialized organisms.
Similar Taxa
- TheridiidaeShares the comb of serrated bristles on hind ; distinguished by different ecological preferences and subtle morphological differences in arrangement and genitalia structure.
- LinyphiidaeSome cave-dwelling linyphiids show convergent troglomorphic traits; distinguished by web architecture and lack of the specialized tarsal comb.
More Details
Troglomorphic radiation
The exhibits extensive in cave , with multiple independent origins of troglomorphic traits including elongated legs, reduced , and depigmentation. The Appalachian Nesticus radiation represents one of the most diverse clades of habitat-specialized spiders, with extensive short-range and lack of sympatry.
Taxonomic history
A 2016 revision of Asian and Madagascan Nesticidae described 43 new , increasing global species count by approximately 20%. A new Speleoticus was established for five cave-dwelling species previously misplaced in other genera.
Conservation significance
Several regional are rare, microendemic . Domitius lusitanicus in Portugal has been proposed as an umbrella for conservation of other troglobionts in the Estremenho Karst Massif. Many cave-dwelling species anthropogenic threats including habitat loss, agriculture, pollution, and tourism impacts.
Sources and further reading
- BugGuide
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- biodiversity | Blog - Part 48
- arachnology | Blog - Part 3
- China | Blog - Part 3
- Domitius lusitanicus (Araneae, Nesticidae) - an umbrella species for the conservation of troglobionts in the Estremenho Karst Massif, Portugal
- A new cave-dwelling spider of the genus Speleoticus (Araneae, Nesticidae) from Sichuan, China
- Two new subterranean Typhlonesticus (Araneae: Nesticidae) from the Alps with notes on their ecology, distribution and conservation
- The spatio-temporal ecology of the spider Kryptonesticus eremita (Nesticidae) in a guano-rich temperate cave
- Domitius lusitanicus (Araneae, Nesticidae) - an umbrella species for the conservation of troglobionts in the Estremenho Karst Massif, Portugal
- Speciational History in a Diverse Clade of Habitat-Specialized Spiders (Araneae: Nesticidae: Nesticus): Inferences from Geographic-Based Sampling
- New species in old mountains: integrative taxonomy reveals ten new species and extensive short-range endemism in Nesticus spiders (Araneae, Nesticidae) from the southern Appalachian Mountains
- Integrative taxonomic revision of the genera Nesticella and Howaia in Japan with the description of five new species (Araneae, Nesticidae, Nesticellini)