Araneus gemma

Classification

Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Araneidae
Genus: Araneus
Species: gemma

Pronunciation

How to pronounce Araneus gemma: /əˈreɪniəs ˈdʒɛmə/

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Summary

Araneus gemma is a common orb-weaver spider inhabiting the western United States and Canada, known for its distinctive physical characteristics and web-building behavior.

Physical Characteristics

Females measure 10 to 12 mm long (may be as large as 23 mm), males are smaller at 6 to 8 mm long. Female coloration ranges from gray to brownish purple, with anterior paired humps on the abdomen and a variable medial light stripe. Males are similar in color and pattern to females.

Identification Tips

Look for characteristic humps on the abdomen and web structures typical of orb-weaver spiders.

Habitat

Found in open areas of trees, large shrubs, and around houses.

Distribution

Western Montana west to British Columbia and south to California.

Diet

Insects caught in webs.

Life Cycle

Details on the life cycle are not provided; however, like other orb-weavers, it likely involves egg sacs being laid in late summer or fall.

Reproduction

Reproduction may involve mating with Araneus gemmoides, resulting in hybrid offspring.

Ecosystem Role

Contributes to the control of insect populations by preying on a variety of insects.

Economic Impact

Generally considered harmless and beneficial in controlling pest populations.

Cultural Significance

Commonly known as the cat-faced spider or jeweled orbweaver spider.

Health Concerns

Harmless to humans; contains low toxicity venom that affects neurotransmitters but is not a threat.

Similar Taxa

Araneus gemmoides

Misconceptions

Often confused with Araneus gemmoides due to shared common names.