# Half-Edged Wall Jumping Spider (*menemerus semilimbatus*) The Half-Edged Wall Jumping Spider (Menemerus semilimbatus) is a small, charismatic arachnid native to the Mediterranean region but now found globally in warm, urban climates. Belonging to the jumping spider family Salticidae, this species is highly regarded for its remarkable agility, curiosity, and keen eyesight. Unlike web-building spiders, it actively stalks its prey, making it an excellent natural pest controller in and around human habitations. Its friendly demeanor and expressive, large anterior eyes often win over those who are otherwise wary of spiders. Observant nature-lovers will spot them darting across sun-warmed walls, pausing to assess their surroundings with intelligent head tilts. - **Category:** [Invertebrate](https://www.snappit.app/explore/categories/invertebrate) - **Rarity:** Common - **Danger:** 1/5 · Very low - **Snaps:** 2 - **Habitat:** Typically found on sun-exposed vertical surfaces such as stone walls, rocks, and the exterior walls of buildings in urban and suburban areas. ![Half-Edged Wall Jumping Spider](https://inaturalist-open-data.s3.amazonaws.com/photos/348113383/medium.jpg) Photo: Kaldari, no known copyright restrictions (public domain), Public domain · [iNaturalist](https://www.inaturalist.org/photos/348113383) ## Appearance This compact spider ranges from 6 to 10 millimeters in length, with females being slightly larger than males. Its body is covered in a dense coat of grayish-brown hairs, highlighted by a distinctive, bright off-white or light-yellow border running along the lateral edges of its carapace. The abdomen is oval-shaped, sporting a pattern of darker V-shaped chevrons and pale patches. Most notable are its four pairs of eyes, with the massive, forward-facing anterior median pair giving it a highly focused, expressive face. Its legs are relatively short, stout, and marked with subtle dark bands. ## Taxonomy - **Kingdom:** Animalia - **Phylum:** Arthropoda - **Class:** Arachnida - **Order:** Araneae - **Family:** Salticidae - **Genus:** Menemerus ## Interesting facts - The species name 'semilimbatus' means 'half-bordered', referring to the light band of hairs lining the sides of its head. - They do not spin webs to catch food, but they do spin a silk dragline anchor before jumping to prevent falling. - They possess a nearly 360-degree field of vision, using secondary eyes to detect motion behind them while focusing forward. ## Special abilities - **Telescopic Vision:** Uses its massive anterior median eyes to perceive color and depth, tracking moving prey accurately from several inches away. - **Hydraulic Leap:** Launches itself up to many times its body length by rapidly increasing fluid pressure in its legs, using a silk safety line as a backup. - **Wall Adhesion:** Utilizes thousands of microscopic hairs on its feet to climb smooth vertical walls and window panes with ease. ## Measurements & details - **Length:** 0+ cm - **Weight:** 0.00005+ kg - **Lifespan:** 1+ years - **Incubation:** 14+ days ## Diet & Feeding An active predator that hunts small crawling and flying insects on vertical surfaces during the day. - **Age differences:** Spiderlings target tiny insects like fruit flies, while mature adults tackle larger prey like houseflies and small moths. - **Primary Foods:** Houseflies, Mosquitoes, Ants, Aphids - **Foraging Method:** Pursuit ## Ecological connections - **Hunts:** [Housefly](https://www.snappit.app/explore/housefly) (*Musca domestica*) — Preys on houseflies on exterior walls. - **Eaten by:** Black and Yellow Mud Dauber (*Sceliphron caementarium*) — Hunted by mud dauber wasps to feed their larvae. - **Competitor:** [Cellar Spider](https://www.snappit.app/explore/cellar-spider) (*Pholcus phalangioides*) — Competes for food and territory on building walls and inside structures. ## Safety **Danger:** 1/5 · Very low No special safety notes yet. ## Frequently Asked Questions ### How to identify Half-Edged Wall Jumping Spider? Compare body proportions, leg shape, abdomen markings and the web, if there is one. Eye arrangement can be decisive but rarely shows up in a casual phone photo. A web is a supporting clue, not proof of who built it. Spider Identifier: upload a photo and compare the visible details. ### How long is Half-Edged Wall Jumping Spider? 0+ cm ### How much does Half-Edged Wall Jumping Spider weigh? 0.00005+ kg ### How long does Half-Edged Wall Jumping Spider live? 1+ years ### What does Half-Edged Wall Jumping Spider eat? An active predator that hunts small crawling and flying insects on vertical surfaces during the day. ### Where is Half-Edged Wall Jumping Spider usually found? Typically found on sun-exposed vertical surfaces such as stone walls, rocks, and the exterior walls of buildings in urban and suburban areas. ### How does Half-Edged Wall Jumping Spider hunt? Pursuit ### How long do Half-Edged Wall Jumping Spider eggs take to hatch? 14+ days ## Where to spot - [Sonoma Plaza](https://www.snappit.app/guides/places/sonoma-plaza) — California, US · Park - [Micke Grove Zoo](https://www.snappit.app/guides/places/micke-grove-zoo) — California, US · Zoo ## More Invertebrate - [Coral](https://www.snappit.app/explore/coral) - [Crab Spider](https://www.snappit.app/explore/crab-spider) (*Mecaphesa asperata*) - [Garden Spider](https://www.snappit.app/explore/garden-spider) (*Araneus diadematus*) - [Brown Recluse Spider](https://www.snappit.app/explore/brown-recluse-spider) (*Loxosceles reclusa*) --- Source: [Half-Edged Wall Jumping Spider Facts — Snappit](https://www.snappit.app/explore/half-edged-wall-jumping-spider)