Maine’s spiders include orb-weavers that build conspicuous garden webs, hunters that patrol tree trunks, and small ambush predators hiding among flowers. This guide introduces ten species native to the state, with identifying features, habitats, and behaviors that can help homeowners, hikers, and curious naturalists make sense of a sighting. Many are easiest to notice in late summer and fall, but their habits and preferred places differ. A spider’s color can vary with age and sex, so treat these descriptions as useful clues rather than a substitute for close identification.
1. Black-and-Yellow Garden Spider (Argiope aurantia)
The black-and-yellow garden spider is a large orb-weaver with a boldly patterned abdomen and long legs banded in black and yellow; females are much larger and more conspicuous than males. It builds a round web among sturdy plants in sunny, open places, including gardens, fields, and the edges of yards, where flying insects are likely to pass. A distinctive zigzag of dense silk, called a stabilimentum, often runs through the web’s center, although its size and shape vary. This species is worth recognizing because its impressive web is easy to spot, while the spider itself is generally focused on catching prey rather than approaching people.
2. Marbled Orbweaver (Araneus marmoreus)
The marbled orbweaver is known for a rounded abdomen marked with intricate patches and swirls, often in orange, yellow, brown, or cream; the exact pattern can differ considerably. It lives in wooded or shrubby places and spins an orb web among vegetation, often in a relatively sheltered spot rather than across an exposed garden path. The species is especially noticeable in late summer and fall, when mature spiders and their webs are easier to find. Its shifting colors and marbled pattern make it one of Maine’s most visually striking web-builders, but identification is best based on the whole pattern and habitat rather than color alone.
3. Furrow Orbweaver (Larinioides cornutus)
The furrow orbweaver is a sturdy, brownish spider with a patterned abdomen and subtle pale markings, so it can blend into weathered wood and vegetation. It often builds a circular web near water or in damp, open habitats, and may also turn up around buildings, bridges, and other structures where flying insects gather. A common resting place is a retreat beside the web, connected to it by a signal line that alerts the spider when prey is caught. Look for the web and its sheltered retreat together: this species is a useful example of how an orb-weaver’s life is organized around more than the visible circle of silk.
4. Six-Spotted Fishing Spider (Dolomedes triton)
The six-spotted fishing spider is a long-legged hunter associated with ponds, marshes, and other still or slow-moving water. It can rest on the surface with its legs spread wide, using vibrations to detect prey, and can move across or briefly beneath the water when disturbed. The name refers to dark spots on the underside of the abdomen, which are not always visible during an ordinary sighting. Unlike an orb-weaver, it does not rely on a prey-catching web; watching it use the water’s surface as both hunting ground and escape route makes this species especially memorable.
5. Dark Fishing Spider (Dolomedes tenebrosus)
The dark fishing spider is a large, dark brown to gray hunter with pale markings and long, sturdy legs. Although it belongs to the fishing-spider family, it is often found away from open water, including on tree trunks, woodland surfaces, and around sheds or other structures. It does not build a web to snare prey, instead relying on speed and ambush; females may carry their egg sacs with their mouthparts before making a nursery for the young. Its size can make an unexpected encounter startling, but the spider is better understood as a shy predator of insects and other small prey than as an animal seeking people.
6. American Nursery Web Spider (Pisaurina mira)
The American nursery web spider is a slender, long-legged hunter, usually marked in muted shades of brown, gray, or green that help it disappear among leaves and stems. It searches vegetation for prey rather than making a sticky capture web, and a female carries her egg sac beneath her body using her jaws and front legs. Near hatching, she builds a loose silken nursery among plants and stays nearby while the spiderlings emerge. That combination of mobile hunting and attentive egg care makes this species a particularly interesting find for anyone observing spiders in gardens, meadows, or woodland edges.
7. Goldenrod Crab Spider (Misumena vatia)
The goldenrod crab spider has a broad, crablike stance, with its front pairs of legs held out to the sides, and is often found waiting on flowers. Females can be white or yellow and may gradually change color to better match the flower they occupy; this is a gradual adjustment, not an instant switch. Rather than spinning a web to catch insects, the spider ambushes visitors such as flies and bees that come to feed on nectar or pollen. It is a good reminder that a flower can be a hunting ground as well as a food source, and that small spiders may be present even when no web is visible.
8. Bold Jumping Spider (Phidippus audax)
The bold jumping spider is a compact, robust hunter, typically black with three conspicuous pale markings on its abdomen and iridescent mouthparts that may appear green or blue. It hunts during the day, using its excellent vision to inspect surfaces and locate prey, then leaps rather than trapping insects in a web. Like other jumping spiders, it can secure itself with a silk safety line before a jump and uses silk for shelter and egg protection. Its alert movements and close-range visual behavior make it one of the easier spiders to observe without disturbing, especially on sunny walls, fences, and vegetation.
9. Pennsylvania Grass Spider (Agelenopsis pennsylvanica)
The Pennsylvania grass spider is a funnel-weaver with a slender, patterned body and long spinnerets that can be seen projecting from the rear of the abdomen. It lays a flat sheet of silk across grass or low vegetation, with a funnel-shaped retreat at one side; the spider waits inside and rushes out when prey crosses the sheet. The web is not sticky, so the spider’s speed and the funnel’s sheltered position are central to catching insects and escaping danger. Look for these webs in lawns, meadow edges, and shrubs, particularly when dew makes their sheet-like structure stand out; a web alone may not reveal the exact species.
10. Eastern Parson Spider (Herpyllus ecclesiasticus)
The eastern parson spider is a quick-moving, dark ground spider with a pale marking on its abdomen that resembles a narrow necktie or collar. It is a nocturnal hunter rather than a web-based insect catcher, spending daylight hours under bark, stones, or other cover and roaming at night for prey. It may occasionally wander indoors, especially where it can find a quiet hiding place, but a single sighting does not mean a home contains an infestation. Its distinctive marking and ground-dwelling habits make it a useful species to know when checking woodpiles, leaf litter, or the sheltered edges of a building.
How to Choose
For a Maine spider, “choosing” usually means deciding what features to check when you want to identify a sighting, photograph a species, or observe one safely. Start with habitat: a spider on a pond’s surface points toward a fishing spider, while a neat circular web in garden vegetation suggests an orb-weaver. Next, note behavior and web structure. A funnel retreat, a flower-top ambush, and a fast daytime leap are different clues, even when the spider’s color is hard to read.
Size and color can help, but they should not carry the identification by themselves. Spider appearance changes with age and sex, lighting can distort colors, and several unrelated species are brown or patterned. If you can do so without touching or harming the animal, photograph it from above and from the side, include the web or nearby habitat, and record where it was found. A clear view of the abdomen, legs, and eye arrangement can help with identification, though some species require close examination by an expert. For a casual backyard record, a confident family or genus identification is more useful than a precise species name based on a guess.
Frequently Asked Questions
Are Maine’s native spiders dangerous to people?
Most spiders encountered around Maine homes and outdoors are not aggressive and are unlikely to bite unless trapped or handled. A spider’s presence is not a reason to touch it; observe it from a comfortable distance, and seek medical advice for a serious or worsening reaction after any bite.
Which Maine spiders build the most noticeable webs?
Black-and-yellow and marbled orbweavers build conspicuous circular webs, while Pennsylvania grass spiders make flat sheets with a funnel retreat. Dew or morning light can make the silk easier to see, especially in grass and shrubs.
Can fishing spiders really walk on water?
They can stand and move on the water’s surface because surface tension supports their light bodies and their legs spread their weight. Six-spotted fishing spiders also use vibrations at the surface to detect prey, and can dive briefly when disturbed.
Why do I find spiders indoors?
Some wander inside while searching for prey or shelter, and others may arrive from nearby vegetation or stored items. A single spider does not establish that a household has a pest problem; reducing clutter and sealing obvious gaps can make indoor hiding places less available.
What is the safest way to identify a spider?
Take a clear photograph without handling it, and note the location, web type, and behavior. Compare those details with a reliable field guide or ask a local naturalist; avoid identifying a spider from color alone.
Final Thoughts
Maine’s native spiders fill very different roles, from web-building insect catchers to flower ambushers and water-edge hunters. Learning a few recognizable species can turn an ordinary walk or garden check into a closer look at local wildlife. Observe webs and spiders without handling them, and use habitat and behavior alongside appearance when making an identification.