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The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.




Apalone spinifera pallida
Apalone spinifera pallida
(Pallid Spiny Softshell)
Reptiles-Turtles
Native Transplant

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Apalone spinifera pallida (Webb, 1962)

Common name: Pallid Spiny Softshell

Taxonomy: available through www.itis.govITIS logo

Identification: Like most trionychids (softshell turtles), Apalone spinifera pallida (Pallid spiny softshell) lacks a hard shell and has a round, flattened, leathery carapace (upper shell). This turtle has a long neck and a snorkel-like, elongated snout with large nostrils containing ridges that extend from each septum (Figure 1; Webb, 1973; Gibbs et al., 2007). The carapace is an olive to light brown color (Behler and King, 1979; Conant and Collins, 1998; Powell et al., 1998). Juvenile Pallid spiny softshell have small white spots on the carapace that become less distinct or are absent anteriorly, however, some juveniles lack the distinctive spotting pattern on their carapace all together and are more uniformly tan or brown (Webb, 1973). The white spots of adult male Pallid spiny softshell are ringed with black, and males retain juvenile markings, while female markings become blotchy grey, olive to brown color with age (Webb, 1973). There is no distinct border to the carapace of this subspecies. Similar to the Eastern spiny softshell, the defining spine-like projections on the front of the shell behind the head along the anterior edge of the carapace called tubercles, are cone-shaped in Pallid spiny softshell (Conant and Collins, 1998; Collins et al., 2010). Pallid spiny softshell have two prominent black-edged, yellow stripes on each side of head and neck (Gibbs et al., 2007). The feet are fully webbed, clawed, and have a mottled coloring with black and yellow streaks (Gibbs et al. 2007).

There are currently five recognized subspecies of spiny softshell (Iverson et al., 2008; Collins and Taggart, 2009; Bickham et al., 2007): Gulf Coast spiny softshell (Apalone spinifera aspera, Agassiz, 1857); Texas spiny softshell (A. s. emoryi , Agassiz, 1857); Guadalupe spiny softshell (A. s. guadalupensis, Webb, 1962); Pallid spiny softshell (A. s. pallida, Webb, 1962); and Eastern spiny softshell (A. s. spinifera, Lesueur, 1827). See the following table for differences between the subspecies or see the following for more morphological differences: Conant and Collins (1989), Bonin et al. (2006), Ernst and Lovich (2009).

Subspecies Carapace pattern Carapace spot pattern placement Carapace rim Tubercle shapes
Eastern spiny softshell Thickly-bordered, large black ocelli Ocelli largest in the middle of carapace Pale rim with black inner border Conical
Pallid spiny softshell Small white spots; ringed black in adult males Spots not present/obvious on anterior (front) No distinct border Conical
Guadalupe spiny softshell Large white spots; ringed black in adult males Spots present on anterior and posterior No distinct border Round, flat wart-like
Texas spiny softshell White spots (not ringed with black) Spots present only on posterior third of carapace Pale rim, widest posteriorly Rounded, not prominent (or absent)
Gulf Coast spiny softshell Black spots and/or ocelli; 2-4 dark lines on posterior carapace Ocelli largest in the middle of carapace Pale rim with black inner border Conical

This species can be mistaken for Apalone mutica (smooth softshell) and A. ferox, the (Florida softshell). Both the smooth softshell and Florida softshell turtles lack the spine-like projections (tubercles) that are present along the anterior edge of the carapace as well as the stripes on the head and neck (Ernst and Lovich, 2009; Beane et al. 2010). Florida softshell also lack strongly patterned feet (Ernst and Lovich, 2009; Beane et al. 2010). Smooth softshell turtles have round nostrils; all other species of softshell turtles have ridges which make the nostrils C-shaped (Powell et al., 2016).

Size: Maximum size females 48 cm, males 24 cm (Webb, 1973)

Native Range: The range of the Pallid spiny softshell (A. s. pallida) is in the Red River basin, west of the Mississippi River in central and western Louisiana, southern Oklahoma extending to the Texas panhandle, as well as south of the Red River Drainage in east Texas extending west and south in the Brazos River drainage (Powell et al., 2016; Franklin, 2018). 

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Apalone spinifera pallida are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA200020001Lower Sacramento

Table last updated 10/14/2024

† Populations may not be currently present.


Ecology: Apalone spinifera is an aquatic turtle species that prefers highly-oxygenated rivers, but also inhabits creeks, canals, impoundments, lakes, and oxbows; especially those with a soft sand or mud bottoms (Ernst and Lovich, 2009; Conant and Collins, 1998; Lindeman, 2001; Stebbins, 2003). Sandbars or mud flats are important habitats and are used for basking and nesting (Gibbs et al., 2007). This species is often seen openly basking on logs or floating along the surface but will also spend some time buried in soft sediment with only the head protruding (Ernst and Barbour, 1989; Ernst and Lovich, 2009). While submerged, this species may supplement respiration through gas exchange across the skin and can remain submerged for upwards of 20 minutes (Ernst and Lovich, 2009). Spiny softshell are rarely found far from the water (Gibbs et al., 2007). Spiny softshell are carnivorous, known to consume fish, carrion, crayfish, insects, and a wide variety of invertebrates (Carr, 1952; Ernst and Barbour, 1989; Ernst and Lovich, 2009; Stebbins, 2003).

Male spiny softshell mature around 130 g body weight while females mature around 15 kg (Robinson and Murphy, 1978). Females lay 4-39 eggs per clutch, with an average of 12-18 eggs. Nesting occurs during late spring and throughout summer, nests are excavated in soil exposed to sunlight, often in close proximity to water on nearby sand or gravel bars, however, nests can be placed further away from water depending on the availability of ideal nesting habitat (Ernst and Barbour, 1989; Ernst and Lovich, 2009; Jensen et al., 2008). Incubation lasts 2 to 3 months (dependent on ambient conditions), and unlike the majority of other turtles, the sex of hatchlings is determined genetically rather than by temperature, producing clutches with similar proportions of male and female hatchlings (Gibbs et al., 2007; Jensen et al., 2008). Female spiny softshell become sexually mature in 4-5 years (Gibbs et al., 2007), and have lived more than 20 years in captivity (Jensen et al., 2008).

Means of Introduction: Most spiny softshell are introduced through the release of pets (Haffner, 1997; Kraus, 2009; Krysko et al., 2011), but there are also illegal stockings and translocations during aquaculture operations (Conant, 1961). Spiny softshell found in the Maurice River system of New Jersey were intentionally introduced from Indiana to establish a local breeding population (Conant, 1961).

Status: Pallid spiny softshell have been collected in the Lower Sacramento Drainage in California. The status of that collection is unknown.

Impact of Introduction: As of yet, this species has not been adequately studied or evaluated to determine what ecological consequences, if any, have resulted from its introduction into the USA or elsewhere. To better understand and adequately assess the possible types and magnitude of any suspected ecological and economic impacts would most likely require further field and laboratory research, along with a review of any possible new literature on the subject.

Pallid spiny softshell; A. s. pallida collected in Illinois could have potentially interbred with indigenous Eastern spiny softshell, A. s. spinifera (Lamer et al., 2006).

Remarks: The taxonomy of A. spinifera has been reviewed or summarized by Webb (1973, 1990), Meylan (1987), Iverson et al. (2008), Weisrock and Janzen (2000), Collins and Taggart (2009), Bickham et al. (2007), and Ernst and Lovich (2009).

Summaries on the literature and natural history of spiny softshells can be found in Webb (1973), Ernst and Barbour (1989), Bonin et al. (2006), Ernst and Lovich (2009), and Collins et al. (2010).

Apalone spinifera is difficult and dangerous to handle because of its sharp claws, sharp, powerful jaws and long protrusive neck; they are quick to defend themselves (Carr, 1952; Werner et al., 2004; Collins et al., 2010), and are aggressive toward members of the same species (conspecifics) (Ernst and Lovich, 2009).

Apalone spinifera has been classified at a risk level of “serious” as a nonindigenous species that could become established in the European Union (Kopecký et al. 2013).

References: (click for full references)

Beane, J. C., A. L. Braswell, J. C. Mitchell, W. M. Palmer, And J. R. Harrison III. 2010. Amphibians and Reptiles of the Carolinas and Virginia. Second Edition, Revised and Updated. The University of North Carolina Press, Chapel Hill. 274 pp.

Behler, J. L., and F. W. King. 1979. The Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf, Inc., New York. 743 pp.

Bickham, J. W., J. B. Iverson, J. F., Parham, H.-D. Philippen, A. G. J. Rhodin, H. B. Shaffer, P. Q. Spinks, and P. P. van Dijk. 2007. An annotated list of modern turtle terminal taxa with comments on areas of taxonomic instability and recent change. Chelonian Research Monographs 4:173-199.

Bonin, F., B. Devaux, and A. Dupré. 2006. Turtles of the World. [English Edition.] The Johns Hopkins University Press, Baltimore. 416 pp.

Carr, A. 1952. Handbook of Turtles. The Turtles of the United States, Canada, and Baja California.  Comstock Publishing Associates, Ithaca and London. 542 pp.

Collins, J. T., S. L. Collins, and T. W. Taggart. 2010. Amphibians, Reptiles, and Turtles in Kansas. Fourth Edition. Eagle Mountain Publishing, LC, Eagle Mountain, Utah. 312 pp.

Collins, J. T., and T. W. Taggart. 2009. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles & Crocodilians. Sixth Edition. The Center for North American Herpetology, Lawrence, Kansas. 44 pp.

Conant, R. 1961. The softshell turtle, Trionyx spinifer, introduced and established in New Jersey. Copeia 1961(3):355-356.

Conant, R., and J. T. Collins. 1998. A Field Guide to Reptiles & Amphibians. Eastern and Central North America. Third Edition, Expanded. Houghton Mifflin Company, Boston. 616 pp.

Ernst, C. H., and R. W. Barbour. 1989. Turtles of the World. Smithsonian Institution Press, Washington, D.C. and London. 313 pp.

Ernst, C. H., and J. E. Lovich. 2009. Turtles of the United States and Canada. Second Edition. The Johns Hopkins University Press, Baltimore. 827 pp.

Franklin, C. J. 2018. Texas Turtles. http://www.texasturtles.org. Accessed on 07/17/2018.

Gibbs, J. P., A. R. Breisch, P. K. Ducey, G. Johnson, the late J. Behler, and R. Bothner. 2007. The Amphibians and Reptiles of New York State (Identification, Natural History, and Conservation). Oxford University Press, New York, NY.

Haffner, P. 1997. Bilan des introductions récentes d’amphibiens et de reptiles dans les milieux aquatiques continentaux de France métropolitaine. Bulletin de Français de la Pêche et de la Pisciculture 344/345:155–163.

Iverson, J. B., P. A. Meylan, and M. E. Seidel. 2008. Testudines—turtles. Pp. 67-74. In: B. I. Crother (chair), and Committee on Standard English and Scientific Names (editors). Scientific and standard English names of amphibians and reptiles of North America north of Mexico, with comments regarding confidence in our understanding. Sixth Edition. Society for the Study of Amphibians and Reptiles Herpetological Circular 37:1-84.

Jensen, J. B., C. D. Camp, W. Gibbons, and M. J. Elliott. 2008. Amphibians and Reptiles of Georgia. 1st edition. The University of Georgia Press, Athens, GA.
Kopecký, O., L. Kalous, and J. Patoka. 2013. Establishment risk from pet-trade freshwater turtles in the European Union. Knowledge and Management of Aquatic Ecosystems 410(2).

Kraus, F. 2009. Alien Reptiles and Amphibians. A Scientific Compendium and Analysis. Springer, [Dordrecht]. 563 pp. + CD-ROM.

Krysko, K. L., J. P. Burgess, M. R. Rochford, C. R. Gillette, D. Cueva, K. M. Enge, L. A. Somma, J. L. Stabile, D. C. Smith, J. A. Wasilewski, G. N. Kieckhefer III, M. C. Granatosky, and S. V. Nielsen. 2011. Verified non-indigenous amphibians and reptiles in Florida from 1863 through 2010: Outlining the invasion process and identifying invasion pathways and status. Zootaxa 3028:1-64 + MorphoBank Project No. p536: URL: http://www.morphobank.org.

Lamer, J. T., J. K. Tucker, and C. R. Dolan. 2006. Geographic distribution: Apalone spinifera pallida (pallid spiny softshell). USA: Illinois: Jersey Co. Herpetological Review 37(2):239.

Lindeman, P. V.  2001.  A contrast in the basking habits of the sympatric trionychids turtles Apalone mutica and A. spinifera. Herpetological Natural History 8(1):87-89.

Meylan, P. A. 1987. The phylogenetic relationships of soft-shelled turtles (Family Trionychidae). Bulletin of the American Museum of Natural History 186(1):1-101.
Powell, R., J. T. Collins, and E. D. Hooper, Jr. 1998. A Key to Amphibians & Reptiles of the Continental United States and Canada. University Press of Kansas, Lawrence. 131 pp.

Powell, R., R. Conant, and J.T. Collins. 2016. Peterson field guide to reptiles and amphibians of eastern and central North America. 4 edition. Houghton Mifflin Harcourt Publishing Company, New York, NY.

Robinson, K.M., and G.C, Murphy. 1978. The reproductive cycle of the eastern spiny softshell turtle (Trionyx spiniferus spiniferus). Herpetologica 34:137-140.

Stebbins, R. C. 2003. A Field Guide to Western Reptiles and Amphibians. Third Edition. Houghton Mifflin Company, Boston. 533 pp.

Webb, R. G. 1990. Trionyx. Catalogue of American Amphibians and Reptiles 487:1-7.

Webb, R. G. 1973. Trionyx spiniferus. Catalogue of American Amphibians and Reptiles 140:1-4.

Weisrock, D. W., and F. J. Janzen. 2000. Comparative molecular phylogeography of North American softshell turtles (Apalone): Implications for regional and wide-scale historical evolutionary forces. Molecular Phylogenetics and Evolution 14(1):152-164.

Author: Daniel, W.M., and Morningstar, C.

Revision Date: 3/1/2019

Peer Review Date: 3/1/2019

Citation Information:
Daniel, W.M., and Morningstar, C., 2024, Apalone spinifera pallida (Webb, 1962): U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?speciesID=2625, Revision Date: 3/1/2019, Peer Review Date: 3/1/2019, Access Date: 10/14/2024

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [10/14/2024].

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