cobweb spiders vs Darwin s Nesoryzomys

Steatoda grossa compared with Nesoryzomys darwini

Key Differences

• cobweb spiders is Least Concern while Darwin s Nesoryzomys is Extinct.

Taxonomic Classification

Rank	cobweb spiders	Darwin s Nesoryzomys
Kingdom same	Animalia (động vật)	Animalia (động vật)
Phylum	Arthropoda (động vật Chân khớp)	Chordata (động vật có dây sống)
Class	Arachnida (Lớp Hình nhện)	Mammalia (lớp Thú)
Order	Araneae (Nhện)	Rodentia (Bộ Gặm nhấm)
Family	Theridiidae	Cricetidae
Genus	Steatoda	Nesoryzomys
Species	Steatoda grossa	Nesoryzomys darwini

Evolutionary Relationship

cobweb spiders and Darwin s Nesoryzomys share a common ancestor at the Kingdom level: Animalia. (động vật)

Conservation Status

cobweb spiders

LC — Least Concern

Darwin s Nesoryzomys

EX — Extinct

Physical Characteristics

Attribute	cobweb spiders	Darwin s Nesoryzomys
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

cobweb spiders

Habitat

Typically found in terrestrial habitats from forests to deserts.

Range

Widely distributed across Africa (South Africa), Europe (29 countries), North America (Canada, United States), and South America (Ecuador).

Darwin s Nesoryzomys

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador.

cobweb spiders

The false black widow (Steatoda grossa) is a cosmopolitan cobweb spider in the family Theridiidae, often mistaken for the true black widow due to its similarly dark, globose abdomen, though it lacks the red hourglass marking. Females reach 6–10 millimeters in body length and display a deep purplish-brown to nearly black coloration with faint pale markings on the dorsal abdomen. Originally native to western Europe, Steatoda grossa has spread globally through human commerce, establishing populations in Australia, New Zealand, North America, and other regions where it thrives in human structures including homes, sheds, and outbuildings. The spider constructs a persistent, tangled cobweb in sheltered corners and recesses, where it captures woodlice, ants, beetles, and other arthropods—notably targeting invertebrates that many other spiders avoid. The venom of S. grossa causes steatodism, a syndrome of localized pain, sweating, and systemic discomfort that is rarely serious but can cause significant distress. Interestingly, the antivenin produced for Latrodectus (true widow) spider bites has been shown to effectively treat Steatoda envenomations, underscoring the phylogenetic relatedness of these genera. Females produce several egg sacs during a season, each containing dozens of eggs wrapped in distinctive silken cocoons. The species is classified as Least Concern given its expanding global distribution facilitated by human activity.

Shared Countries

Both species can be found in 1 countries:

🇪🇨 Ecuador