Definition
Tibellus oblongus is a species of spider belonging to the family Philodromidae, commonly referred to as running crab spiders.
Overview
The species is placed in the genus Tibellus, which comprises a group of slender, elongated spiders that are typically ground‑dwelling or found on low vegetation. T. oblongus has been recorded in parts of Europe and western Asia, although precise distribution data are limited. Like other members of its genus, it is a cursorial hunter that does not build capture webs but actively pursues prey.
Etymology/Origin
The specific epithet oblongus is derived from the Latin adjective “oblongus,” meaning “elongated” or “oblong,” referring to the spider’s notably stretched body shape.
Characteristics
- Morphology: Tibellus oblongus exhibits an elongated, somewhat flattened cephalothorax and abdomen, giving it a streamlined appearance. The coloration is generally pale brown to tan, often with subtle darker markings that aid in camouflage among leaf litter and grass stems.
- Size: Adult body length typically ranges from 4 to 7 mm, with leg span proportionally long to facilitate rapid movement.
- Eyes: As is characteristic of Philodromidae, the species possesses eight eyes arranged in two rows, providing a broad field of vision suited for active hunting.
- Behavior: It is a nocturnal or crepuscular predator, relying on speed and stealth rather than web capture. The spider hunts small insects and other arthropods, using its ambush tactics on low vegetation or ground cover.
- Reproduction: Females lay small egg sacs attached to vegetation; however, detailed reproductive biology for T. oblongus remains insufficiently documented.
Accurate information is not confirmed for certain aspects such as exact geographic range, population status, and detailed life‑history traits, due to limited published research.
Related Topics
- Genus Tibellus – a group of elongated, ground‑dwelling running crab spiders.
- Family Philodromidae – the broader family encompassing running crab spiders, known for their agility and lack of web building.
- Running crab spiders – common name for spiders in Philodromidae, distinguished by their crab‑like sideways movement and hunting strategy.
- Araneomorphae – the infraorder containing the majority of modern spider species, including Philodromidae.
Note: While Tibellus oblongus appears in taxonomic listings, comprehensive ecological and biological data are scarce, and further research may refine the details presented above.