Ballus chalybeius
species of arachnid
Ballus chalybeius is a jumping spider. It is the type species of the genus Ballus.
Appearance
This flattened spider can reach a length of 3–4 millimetres (0.12–0.16 in). The prosoma is dark brown in females, with irregular lighter markings. The lightly yellow legs have dark rings in both sexes. In males, which are generally darker, the first legs are dark and thickened. The species is similar to Ballus rufipes, which is smaller and much darker.
Habits
During summer, the female builds a flat silken retreat on the underside of a leaf and guards its egg sac inside.
Habitat
It can be found mostly on the fringes of deciduous forests, on broad-leaved bushes and trees, particularly oaks, and in the grass. In Central Europe, they are widely distributed and in most areas quite common.
This brief starts where responsible research should: with the source description of “Ballus chalybeius” as species of arachnid. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the science & nature register because the source frames it as species of arachnid. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated Sep 11, 2025. The linked authority identifier is Q1758710. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Ballus chalybeius” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.