• Photo of the steep natural entrance of Carlsbad Caverns

    Carlsbad Caverns

    National Park New Mexico

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  • Cave Lighting Project

    We are undergoing a year-long lighting project in the cavern. Please be aware of caution tape along pathways inside the cave and use due care.

Other Invertebrates (corals, sponges, worms, etc.)

A horsehair worm in the phylum Nematomorpha.
A Horsehair Worm in the phylum Nematomorpha.
NPS Photo by Kristin Dorman-Johnson

Horsehair worms are the aquatic adult phase of little-known invertebrate animals. The immature stages are parasites in the bodies of grasshoppers, crickets, cockroaches, and some beetles. When mature, they leave the host to lay eggs. These interesting creatures are not parasites of humans, livestock, or pets, and pose no public health threat. The adult "worms" mate in water and females lay long gelatinous strings of eggs. After the eggs hatch, scientists believe that each larva forms a protective covering or cyst. If the cyst is eaten by a suitable insect, the protective covering dissolves and the released larva bores through the gut wall and into the body cavity of the host. There, it digests and absorbs the surrounding tissue. When mature, it leaves the host insect to start the process again. Emergence from the host occurs only when the host is near water. Occasionally, they are found after a cricket or cockroach is killed by someone crushing the insect, at which time the worm begins to wiggle out of the insect's body.

Horsehair worms have also been seen in the caves of Carlsbad Caverns National Park and in streams in the Guadalupe Mountains. They are fascinating, but rarely encountered.

We can guess-fairly accurately-that the park provides habitat for numerous other strange invertebrate animals that are yet to be studied.

Did You Know?

The Hall of Giants in Carlsbad Cavern.

The 119 caves of Carlsbad Caverns National Park were carved out not by running water and streams like many limestone caves in the world, rather these caves were dissolved by very aggressive sulfuric acid.