''Larinioides cornutus'', the furrow spider,Weber, Larry (2003). ''Spiders of the North Woods''. Duluth, MN: Kollath+Stensaas Publ. pp. 88–89. furrow orb spider, or foliate spider is an orb-weaver spider with

Holarctic The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal Kingdom. It includes both the Nearctic zoogeographical reg ...

distribution. Orb weaver bites are not especially dangerous for humans, though symptoms include mild pain, numbness, and swelling. Rarely, nausea and dizziness may occur.

Physical description

Females reach a body length of about 6–14 mm, males up to 5–9 mm. Leg spans range from 18 to 35 mm. These spiders can be identified by their large, oval-shaped, bulbous abdomens. Colors can range from black, grey, and shades of red. The carapace on their abdomen almost always has a lighter shaded arrow pointing toward their cephalothorax, while the legs also have a similar arrow pattern. Their eye structure consists of a horizontal row of 6 eyes, with an additional pair above the center of the row. A common misconception is that spiders cannot hear, due to their lack of ears or other common structures. However, these animals do have the ability to sense sound due to macrosetate and filiform hairs on their legs.

Habitat

These spiders are most often found in moist areas, especially near water. The web is built between grass or in low shrubbery. They hide during the day in a silken retreat that opens at the bottom, masked with plant and animal matter and leave it during the night. The web is remade in the evening.Bellmann, H. (1997). Kosmos-Atlas Spinnentiere Europas. ''Kosmos''. Unlike many other species of animal and spider, the cornutus does not hibernate in winter, and instead has an annual cycle of seasonal resistance. While their

supercooling Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid below its freezing point without it becoming a solid. Per the established international definition, supercooling means ''‘cooling a substance be ...

point in summer is −8 °C, in winter it drops to −20 °C.

Reproduction

Like mating in many other spiders, the females create a silk cocoon for copulation. The females reside in the cocoon, and emit pheromones to lure males, who can sense them through

chemoreceptor A chemoreceptor, also known as chemosensor, is a specialized sensory receptor which transduces a chemical substance ( endogenous or induced) to generate a biological signal. This signal may be in the form of an action potential, if the chemorece ...

s. The males insert sperm using their

pedipalp Pedipalps (commonly shortened to palps or palpi) are the secondary pair of forward appendages among Chelicerata, chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to ...

s, and fertilize the eggs of the female. These become yellow egg sacs. Like many other types of spiders, males typically die after mating, oftentimes by being eaten by the female. This evolutionary trait of spiders still remains partially unknown. The male lives with the female during mating time, which is in autumn and again in spring. The female produces three to five yellow egg sacs during the summer. There is possibly a distinct species ''L. folium'', which is very similar but occurs in dry habitat.

Gallery

File:2025-04-04 190220 DT3 0001 I w248.jpg, Friday_04-April-2025 Furrow Orb-weaver - Larinioides cornutus in South-Central Kentucky File:2025-04-04 190314 DT3 0003 I w248.jpg, Friday_04-April-2025 Furrow Orb-weaver - Larinioides cornutus in South-Central Kentucky

References

External links

* Spiders described in 1757 Taxa named by Carl Alexander Clerck Araneidae Articles containing video clips Spiders of Europe Holarctic spiders {{Araneidae-stub