Gasteracantha cancriformis
(Spiny-backed Orb-weaver)

Featured spider picture The spider species Gasteracantha cancriformis, commonly known as Spiny-backed Orb-weaver, belongs to the genus Gasteracantha, in the family Araneidae. Gasteracantha cancriformis spiders have been sighted 54 times by contributing members. Based on collected data, the geographic range for Gasteracantha cancriformis includes 7 countries and 9 states in the United States. Gasteracantha cancriformis is most often sighted outdoors, and during the month of May.

Taxonomic Hierarchy

  • Kingdom: Animalia
  • Phylum: Arthropoda
  • Class: Arachnida
  • Order: Araneae
  • Suborder: Araneomorphae
  • Family: Araneidae
  • Genus: Gasteracantha
  • Species: Gasteracantha cancriformis

Common Name (AASMore information icon)

Spiny-backed Orb-weaver

Other Common Names

Spiny Orb-weaver, Thorn-belly Orb-weaver, Jewel Box Spider, Crab-like Orb-weaver

Author

Carl Linnaeus, 1758

Primary Colors


Sightings Overview

There have been 54 confirmed sightings of Gasteracantha cancriformis (Spiny-backed Orb-weaver), with the most recent sighting submitted on May 27, 2019 by Spider ID member winnie. The detailed statistics below may not utilize the complete dataset of 54 sightings because of certain Gasteracantha cancriformis sightings reporting incomplete data.

  • Web: 87% of the time, Gasteracantha cancriformis spiders are sighted in a spider web (Sample size: 45)
  • Sex: 14 female and 1 male.
  • Environment: Gasteracantha cancriformis has been sighted 48 times outdoors, and 3 times indoors.
  • Outdoors: Man-made structure (18). Low foliage (17). High foliage (10). Freshwater river, lake, stream (1). Open field, pasture, grassland (1). Forest (1).

Location and Range

Gasteracantha cancriformis (Spiny-backed Orb-weaver) has been sighted in the following countries: Bermuda, Brazil, Colombia, Honduras, Mexico, Panama, United States.

Gasteracantha cancriformis has also been sighted in the following states: Alabama, Florida, Georgia, Hawaii, North Carolina, South Carolina, Tennessee, Texas, Virginia.

Seasonality

Gasteracantha cancriformis has been primarily sighted during the month of May.

  • January: 7
  • February: 4
  • March: 10
  • April: 4
  • May: 11
  • June: 3
  • July: 3
  • August: 3
  • September: 1
  • October: 4
  • November: 1
  • December: 3

Additional Remarks

  • The egg sac of this species is a flattened mass of tangled bright yellowish-green silk, often with a thin, vertical stripe of dark green silk on top.
  • Adult males are smaller than the females and do not have prominent spines like the females do. They still have some “lumpy” protrusions, though.
  • The shape and length of the spines of the spider may have geographic variations.
  • The orb web may have tufts of silk sporadically placed on the threads.

Featured Pictures

Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Dorsal Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Ventral Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Ventral Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Dorsal,Webs Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Dorsal Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Dorsal Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Dorsal Enlarge Picture
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Picture of Gasteracantha cancriformis (Spiny-backed Orb-weaver) - Ventral Enlarge Picture
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