Spiny Softshell

Spinny Softshell.  Photo by Jeff Tibbits

Category
Reptiles
Status
Species of Greatest Conservation Need

Description

The two species of softshell turtles (spiny and smooth) can easily be distinguished from all other turtles in Oklahoma by the total lack of scutes on the shell. Shells are relatively smooth and leather-like, except that the spiny softshell has distinct spines at the front and back of the shell. Edges of the shell are flexible. Webbing on feet is complete and the snout is long and thin. The nasal openings of spiny softshells have small ridges projected toward the center. Consequently, the openings are not completely round as in the smooth softshell.

Size

Adult females can reach 17 inches in carapace length whereas males are much smaller, reaching only about nine inches. Hatchlings are about an inch and a half in carapace length.

Habitat

Spiny softshells have a wide distribution in North America, extending nearly continuously west to east from Oklahoma through western New York with additional populations in the Colorado and Rio Grand River systems in the west. They occur in the Missouri River drainage from central Montana in the north to the Gulf Coast and south through Texas and into Mexico.

Life History

Spiny softshells are totally aquatic and are most common in rivers, streams, and lakes. They deposit clutches of 3-40 eggs once or twice each season in sandbars from late May through July. Hatchlings appear in August and September. Although spiny softshells are omnivorous, their diets consist mostly of insects and aquatic invertebrates, such as crayfish and snails.

Wildlife Watching Tips

These turtles can often be seen basking on sand banks in streams and beaver dams in ponds that are connected to waterways. At a distance, spiny softshells are difficult to distinguish from smooth softshells. They can occasionally be found by walking in stream bottoms when water is low and searching in pools. They are common in most permanent streams and lakes, but often remain hidden under the sand. By remaining stationary for five to ten minutes and carefully searching the surface of the water in shallow areas, an observer can see their heads when they project them out of the sand and to the water surface to breath. Softshells are powerful swimmers, can run rapidly on land, and have sharp beaks and powerful jaws. They should be handled with car by gripping at the back of the shell.

(This profile was created by Dr. Laurie Vitt as part of a partnership between the Wildlife Department and the Sam Noble Oklahoma Museum of Natural History. It was funded as part of a larger State Wildlife Grant to survey and inventory amphibians and reptiles of the Wildlife Management Areas of Oklahoma:  T-35-P-1.)

Explore more Oklahoma Reptiles

Graham’s Crayfish Snake.  Photo by Douglas Mills/Flickr.com
Photo by: Douglas Mills/Flickr
Ring-necked Snake.  Photo by Andrew DuBois/Flickr.com
Photo by: Andrew DuBois/Flickr
Rough Greensnake.  Photo by George Zimmer/RPS 2020
Photo by: George Zimmer/RPS 2020

Want the 58 amphibian and 94 reptile species and subspecies that can be found within the state's boundaries in book format?  Head to the Outdoor Store to purchase "A Field Guide to Oklahoma's Amphibians and Reptiles".  Each account shares detailed photos of the animal along with a physical description, information about the food and habitat preferences, and notes on the life cycle and habits of the species. Revenue supports the Wildlife Department's Wildlife Diversity Fund.
For information on taking or attempting to take reptiles and amphibians or possessing reptiles or amphibians consult the current regulations.