Phormictopus cancerides, also known as the Hispaniolan giant tarantula, is a tarantula endemic to Hispaniola in the Caribbean.

Hunting
During the day they hide under rocks and debris, and come out at night to look for prey. Their fangs are quite formidable at more than 2 centimeters long, and when they pierce the body of its prey, venom is injected, which paralyzes and breaks down the internal body tissue, allowing the tarantula to suck up the liquified insides. Its bite is rarely harmful to humans, but can cause irritation and swelling.

Names
In the Dominican Republic, it is called cacata; in Haiti, it is called araignée-krab (literally "crab spider").

As prey

Their most dangerous predator is the tarantula hawk. Locally, it is known as a matacacata ("tarantula-killer"). This is a very large parasitoid wasp, with an iridescent blue-green body and orange-red wings that grows to about 2 inches or more in length. It captures the spider in its burrow or sometimes in the open and stings it to paralyze it and then lays its eggs on the abdomen. The wasp will drag its victim to a safe place to incubate its young. Once the larvae hatch they will feed on the alive but paralyzed tarantula until it dies.

Footnotes

References 

 Kovařík, František (2001): Chov sklípkanů (Keeping tarantulas), Jihlava. 

Theraphosidae
Spiders of the Caribbean
Arthropods of the Dominican Republic
Spiders described in 1806