Cyclocosmia truncata

Cyclocosmia truncata is a species of cork-lid trapdoor spider in the family Halonoproctidae. It is found in the United States.^[1] When threatened, Cyclocosmia truncata retreats into its burrow and uses its rigid, disc-shaped abdomen to plug the entrance, a defensive behavior known as phragmosis.^{[citation needed]}

Illustration by Hentz

Cyclocosmia truncata
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Infraorder:	Mygalomorphae
Family:	Halonoproctidae
Genus:	Cyclocosmia
Species:	C. truncata
Binomial name
Cyclocosmia truncata (Hentz, 1841)