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Home » Guide » Arthropods (Arthropoda) » Chelicerates (Chelicerata) » Arachnids (Arachnida) » Spiders (Araneae) » Mygalomorphs (Mygalomorphae) » Cork-lid trapdoor spiders (Halonoproctidae) » Ummidia

Genus Ummidia

Classification · Synonyms and other taxonomic changes · Explanation of Names · Size · Identification · Range · Food · Life Cycle · Print References · Internet References

I think it's a Ravine Trapdoor Spider - Ummidia

Is this the venomous kind of Australian mouse spider (Missulena something?) or.... nothing to worry about? - Ummidia

Classification

Kingdom Animalia (Animals)

Phylum Arthropoda (Arthropods)

Subphylum Chelicerata (Chelicerates)

Class Arachnida (Arachnids)

Order Araneae (Spiders)

Infraorder Mygalomorphae (Mygalomorphs)

Family Halonoproctidae (Cork-lid trapdoor spiders)

Genus Ummidia

Synonyms and other taxonomic changes

Ummidia Thorell, 1875

Gender: Feminine

Explanation of Names

Perhaps named for a famous Roman Woman Ummidia Quadratilla.

Size

Circa 17 mm

Identification

Saddle-like depression on tibia of third leg characteristic of this genus:

Species-level identification seems to be very difficult. Females, in general, cannot be keyed to species. Males can perhaps be keyed with a specimen and reference to keys. See Godwin and Bond (2021) for discussion.

Range

Virginia south to Florida, west to Arizona, also neotropics.

Food

Predatory on terrestrial invertebrates

Life Cycle

Dig tunnel in ground and seal with a silk-hinged lid. They hide under this lid and make forays out when prey is sensed, presumably by vibration. Males are often found wandering in late spring, presumably looking for mates.

Print References

Chamberlin, R. V. & Ivie, W. (1945a). On some Nearctic mygalomorph spiders. Annals of the Entomological Society of America 38: 549-558.

Godwin RL, Bond JE (2021) Taxonomic revision of the New World members of the trapdoor spider genus Ummidia Thorell (Araneae, Mygalomorphae, Halonoproctidae). ZooKeys 1027: 1-165. https://doi.org/10.3897/zookeys.1027.54888

Roddy, L. R. (1957). Some spiders from southeastern Louisiana. Transactions of the American Microscopical Society 76: 285-295.

Internet References

TAMU

Photo from Costa Rica

Photo from Baja California--the well-concealed trapdoor

Excerpt from Natural History of the Sonoran Desert

Wikipedia

Spiders of Texas

Contributed by Cotinis on 10 September, 2004 - 5:46pm
Additional contributions by Robin McLeod, Chuck Entz, mhedin
Last updated 11 July, 2024 - 6:47pm

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