Araneidae Clerck, 1757

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Charlotte, the spider in the book "Charlotte's Web," belonged to this family of spiders.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/Author©1995-2012, The Regents of the University of Michigan and its licensors
Sourcehttp://www.biokids.umich.edu/critters/Araneidae/

Associations:

In Great Britain and/or Ireland:
Animal / predator / stocks nest with
female of Episyron rufipes stocks nest with Araneidae

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/AuthorBioImages, BioImages - the Virtual Fieldguide (UK)
Sourcehttp://www.bioimages.org.uk/html/Araneidae.htm

Known predators:

Araneidae (Araneidae (spiders)) is prey of:
Salvelinus fontinalis

Based on studies in:
Canada: Ontario, Mad River (River)

This list may not be complete but is based on published studies.

  • W. E. Ricker, 1934. An ecological classification of certain Ontario streams. Univ. Toronto Studies, Biol. Serv. 37, Publ. Ontario Fish. Res. Lab. 49:7-114, from pp. 78, 89.
Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorCynthia Sims Parr, Joel Sachs, SPIRE
Sourcehttp://spire.umbc.edu/fwc/

Known prey organisms:

Araneidae (Araneidae (spiders)) preys on:
Bacillariophyceae
algae
detritus

Based on studies in:
Canada: Ontario, Mad River (River)

This list may not be complete but is based on published studies.

  • W. E. Ricker, 1934. An ecological classification of certain Ontario streams. Univ. Toronto Studies, Biol. Serv. 37, Publ. Ontario Fish. Res. Lab. 49:7-114, from pp. 78, 89.
Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorCynthia Sims Parr, Joel Sachs, SPIRE
Sourcehttp://spire.umbc.edu/fwc/

Communication and Perception:

Communication among orb-weavers is mostly by touch and web vibrations, though there are probably some chemical signals too. Their vision is not good enough for much visual communication.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/Author©1995-2012, The Regents of the University of Michigan and its licensors
Sourcehttp://www.biokids.umich.edu/critters/Araneidae/

The family Araneidae (orbweavers) includes more than 3000 described species; nearly 7% of all known spider species are araneids (Platnick 2013). In North America north of Mexico, there are around 161 known araneid species placed in 31 genera. Of the seven families of spiders that spin flat orb webs, the Araneidae has the most species. Many araneids are fairly large and colorful and the family includes a number of familiar spiders. Most araneids have roundish bodies and fairly short, relatively thick legs. In some species, there is strong sexual size dimorphism, with males much smaller than females. (Bradley 2013) Like most spiders, araneids have eight eyes.

Many araneid species have distinctive dark patches and light spots on the underside of the abdomen. These are especially conspicuous when viewed with a flashlight or headlamp at night. For example, the larger Araneus species and all Neoscona have a large rectangular black area with white or yellowish spots or comma-shaped marks at each corner. Argiope have a black patch with many small pale spots. Other genera, such as Aculepeira and Metepeira, have a black patch with white lines. These markings are often helpful in recognizing genera, but are rarely sufficient to identify particular species. (Bradley 2013)

Orbweavers have relatively poor vision and sense their prey by their vibrations. When a potential food item hits a web, the spider rushes over and quickly wraps it in a cocoon of silk, biting and paralyzing it once it is sufficiently immobilized. The wrapped prey may be cut out of the web and brought back to the web hub or to a retreat, where the spider begins feeding. Unlike many spiders, araneids chew their food (Levi 2005). Sometimes a wrapped prey item is kept for some time before being consumed. Although most araneids build vertical orb webs, Mecynogea build a fine-meshed horizontal web and a few species spin reduced webs or capture prey in other ways (e.g., Mastophora bolas spiders, which attract male moths with scent and catch them by swinging a thread with an attached sticky ball at them as they approach). Nocturnal orbweavers may take down their webs in the morning and eat them, then re-build them in the evening; diurnal orbweavers rebuild their webs in the morning. (Levi 2005; Bradley 2013)

Most larger araneids in North America mature in summer and fall, but others mature in spring. Typical life span is one to two years. Dew-covered webs are easily located by walking toward the sun in the morning. Araneids are collected by beating branches or sweeping vegetation with a net. The American araneid fauna has been revised and illustrated by H.W. Levi and his students (1968 to present) and Dondale et al. (2003) have illustrated additional species. (Levi 2005)

The araneid Araneus cavaticus is perhaps the most famous spider in literature (at least in the English language), since this species was the model for Charlotte in Charlotte's Web by the 20th century American author E.B. White.

(Levi 2005; Bradley 2013)

Licensehttp://creativecommons.org/licenses/by/3.0/
Rights holder/AuthorLeo Shapiro, Leo Shapiro
SourceNo source database.

Development:

Spiders hatch from eggs. The hatchlings look more or less like grown-up spiders, though sometimes their colors change as they age. To grow they have to shed their exoskeleton. They do this many times during their lives.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/Author©1995-2012, The Regents of the University of Michigan and its licensors
Sourcehttp://www.biokids.umich.edu/critters/Araneidae/

Lifespan/Longevity:

Adult Orb-weavers can't usually survive below-freezing weather, so they don't live for more than a year. In tropical regions with warm winters, they may live longer.

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/Author©1995-2012, The Regents of the University of Michigan and its licensors
Sourcehttp://www.biokids.umich.edu/critters/Araneidae/

AraneidaeAnimalia

Araneidae Clerck, 1757

LicensePublic Domain
Rights holder/AuthorNo known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
Sourcehttp://treatment.plazi.org/id/D10E729C35FE958AB2FBC34E10A91720

Reproduction:

In Michigan most orbweavers probably mate in the summer, and females start producing their eggs later in the summer. They make round egg cases of silk, and put their hundreds of little eggs inside. The spiderlings often hatch before winter comes, but they stay inside the egg case until spring.

Breeding season: Late summer.

Key Reproductive Features: semelparous ; seasonal breeding ; year-round breeding ; sexual ; fertilization (Internal ); oviparous

Males do not contribute to care for the offspring in this group. Females will sometimes watch over their eggs as long as they can, but they die when it gets too cold (the babies survive in their egg sack).

Parental Investment: female parental care

Licensehttp://creativecommons.org/licenses/by-nc-sa/3.0/
Rights holder/Author©1995-2012, The Regents of the University of Michigan and its licensors
Sourcehttp://www.biokids.umich.edu/critters/Araneidae/
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith