Spiny Softshell (Apalone spinifera)

Group Turtles
Code ARAAG01030
Order Testudines
Family Trionychidae
Author (LeSueur, 1827)
Rank G5 (definitions)
Occurrence P (definitions)
Scale C (definitions)

County List:

Western UP none
Eastern UP none
Northern LP Kalkaska, Bay, Benzie, Clare, Lake, Gladwin, Grand Traverse, Isabella, Crawford, Osceola, Oscoda, Roscommon, Ogemaw, Wexford, Manistee, Oceana, Mason, Mecosta, Midland, Missaukee, Newaygo
Southern LP all

Rule:

Mixed Forested/Nonforested or Nonforested Landscapes

      (Lake or River)
view decision rule term definitions

Habitat List:

Habitats Regen Sap Pole Sm Saw Lg Saw Uneven
Aspen nonononono-
Paper Birch nonononono-
Oak nononononono
Assorted Hardwoods nononononono
Northern Hardwoods nononononono
Spruce/Fir nononononono
Hemlock nononononono
Jack Pine nononononono
Red Pine nononononono
White Pine nononononono
Conifer Plantations nonononono-
Mixed Upland Hardwoods nononononono
Mixed Northern Hardwoods nononononono
Mixed Upland Conifer nononononono
Mixed Pine nononononono
Swamp Hardwoods nononononono
Balsam Poplar & Swamp Aspen & Swamp Birch nononononono
Bottomland Hardwoods nononononono
Tamarack nononononono
Northern White Cedar nononononono
Black Spruce nononononono
Mixed Lowland Hardwoods nononononono
Mixed Lowland Conifer nononononono
Non-ForestedLake, River
Special Featuresnone

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Literature:

Harding, J. H. and J. A. Holman. 1997. Michigan turtles and lizards a field guide and pocket reference. Co-operative Extension Service, Michigan State University. 94 pp.

These turtles occur in rivers, large lakes, and impoundments; sandy or muddy bottoms are favored. They will bask on logs or sloping banks but spend much time buried in sand or mud in shallow water where they can use their snorkel-like noses and long necks to get air. Softshells can breath underwater by absorbing their oxygen through throat and cloacal linings. This may explain their sensitivity to pollutants that also kill fish.

Crayfish are reported to be the favorite food of this species, though they will also eat aquatic insects, snails, tadpoles, and fish.

Nesting in open sunny sites near water.


DeGraaf, R. M. and D. D. Rudis. 1986. New England wildlife: habitat, natural history, and distribution. GTR NE-108. Broomall, PA:USDA, Forest Service, Northeastern Forest Experiment Station. 491 pp.

Habitat: Aquatic, inhabiting large river systems. Also found in lakes and ponds. Intolerant of pollution from sewage, industrial, or chemical wastes. Basks on sand bars, mud flats, grassy beaches, but will use logs, rocks, and other objects when sandy or muddy banks are not available. Hibernates in river bottom mud.

Special Habitat Requirements: Shallow muddy bottoms for burrowing. Some aquatic vegetation essential.

Eggs laid in sandy soil or gravel beds near water's edge.