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A survey of freshwater mussels (Unionidae) of the Old Sabine Wildlife Management Area, Smith County, Texas.

Abstract. -- This study examined diversity and abundance of freshwater mussels (Family Unionidae) in the Sabine River Sabine River

River, eastern Texas and western Louisiana, U.S. Rising in northeastern Texas, it flows southeast and south, broadens near its mouth to form Sabine Lake, and continues from Port Arthur, Texas, through Sabine Pass to enter the Gulf of Mexico after a course of 578
 and an old channel of the river that occur within the boundaries of the Old Sabine Bottom Wildlife Management Area (OSBWMA) of the Texas Parks and Wildlife Department The Texas Parks and Wildlife Department is a Texas state agency that oversees and protects wildlife and their habitats. In addition, the agency is responsible for managing the state's parks and historical areas.  (TPWD TPWD Texas Parks and Wildlife Department ). Nine sites on the river and nine sites on the Old Channel each 40m in length were surveyed by hand searches for buried mussels. A total of 477 individuals of 17 species were found and three additional species were recorded during other studies within the OSBWMA. Species diversity indices were not different but some species were restricted to either the river or Old Channel. Nearly 60% of the species that could potentially occur in these waters were found but their numbers at all sites were low compared to other studies and a large percentage of specimens from the river samples were dead. Even though over 90% of the OSBWMA is forested erosion of the riverbank was evident and some beds of dead mussels were covered in sediment.


Riverine riv·er·ine  
1. Relating to or resembling a river.

2. Located on or inhabiting the banks of a river; riparian: "Members of a riverine tribe ...
 mussels have historically dominated aquatic systems of the southeastern United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area.  and their biomass in undisturbed rivers can exceed all other benthos benthos: see marine biology.  by an order of magnitude A change in quantity or volume as measured by the decimal point. For example, from tens to hundreds is one order of magnitude. Tens to thousands is two orders of magnitude; tens to millions is three orders of magnitude, etc.  (Strayer et al. 1994). They often occur in dense multispecies beds and perform significant functional roles such as removing suspended organic material, moving sediments and providing habitat for other invertebrates (Strayer et al. 1999; Vaughn & Hakenkamp 2001). The mussels of the family Uniondae of the United States are highly speciose with over 300 species known (Neves 1993). However, North American North American

named after North America.

North American blastomycosis
see North American blastomycosis.

North American cattle tick
see boophilusannulatus.
 mussel mussel, edible freshwater or marine bivalve mollusk. Mussels are able to move slowly by means of the muscular foot. They feed and breathe by filtering water through extensible tubes called siphons; a large mussel filters 10 gal (38 liters) of water per day.  populations have been declining for over a century with 35 species now presumed extinct and more than 40% imperiled to some degree (Neves et al. 1997; Vaughn 1997; Brown & Banks 2001). For many states, the extent of declines for specific species is simply not known (Bogan 1993; Layzer et al. 1993; Neves 1993). Over harvesting, pollution, reservoirs and other human activities have been implicated in mussel losses elsewhere and are certainly issues for this fauna in Texas (Shannon et al. 1993; Howells et al. 1996; Howells 1997).

Texas has over fifty species of unionid mussels in multiple river basins that often have isolated drainage into the Gulf of Mexico Noun 1. Gulf of Mexico - an arm of the Atlantic to the south of the United States and to the east of Mexico
Golfo de Mexico

Atlantic, Atlantic Ocean - the 2nd largest ocean; separates North and South America on the west from Europe and Africa on the east
 (Howells et al. 1996). Consequently, species composition in eastern Texas differs from that of central and western areas (Neck 1982). Water pollution has long impacted the freshwater fauna of east Texas (Shira 1913; Howells 1997). Further, 31 reservoirs have been constructed on its rivers over the years and the change dams cause to water flow downstream is known to have major impacts on mussel diversity and abundance (Vaughn & Taylor 1999; Howells et al. 2000). In addition, erosion from agricultural land and commercial harvesting of mussels have also impacted the freshwater mussels of this area (Neck 1986; Howells 1997). Yet almost no studies on the mussels of the river basins in eastern Texas have been conducted (Howells 1997; Bordelon & Harrel 2004). For example, the upper stretches of the Sabine River have been intensely fished by commercial musselers (Howells 1993; Howells et al. 1996) but the only published surveys of the mussels of this drainage are for Lake Tawakoni Lake Tawakoni is an artificial reservoir located approximately 35 miles (55 km) east of Dallas, Texas and 10 miles (15 km) northeast of Wills Point, Texas. It lies within three Texas counties, Hunt, Rains, and Van Zandt. It is used for water supply and recreation.  (Neck 1986), a Master's thesis written in 1940 (Bechtel 1940) and in-house Texas Parks and Wildlife Department (TPWD) reports summarized in Howells (1997).


The Sabine River arises in the eastern part of north-central Texas (Hunt, Collin, and Rockwall counties), flows southeastward through eastern Texas for approximately 890 km and terminates at Sabine Lake Sabine Lake is a 90,000 acre (364 km²) salt water estuary formed by the confluence of the Sabine River and the Neches River. It drains through Sabine Pass into the Gulf of Mexico. The lake borders Jefferson County, Texas, Orange County, Texas, and Cameron Parish, Louisiana. , an estuary of the Gulf of Mexico. The TPWD 's Old Sabine Bottom Wildlife Management Area (OSBWMA) is located 109 km south of Lake Tawakoni in Smith County, Texas Smith County is a county located in the U.S. state of Texas. In 2000, its population was 174,706. Its county seat is Tyler6. Smith county is named for James Smith, a general during the Texas Revolution.  and receives flow from both the Sabine River and Lake Fork Lake Fork might refer to:
  • Lake Fork Mohican River in Ohio
  • Lake Fork (Texas)
 Creek. The OSBWMA is 2318 hectares of mostly bottomland, hardwood forest along 38 km of the southern bank of the Sabine River. Eighteen km of an old channel of the Sabine River forms much of the southern boundary of the area. The Sabine River at this site has a fall of 0.2 m per km, an average depth of less than 1 m and a flow averaging less than 5 CMS (1) See content management system and color management system.

(2) (Conversational Monitor System) Software that provides interactive communications for IBM's VM operating system.
 in the summer and 2 m and less than 115 CMS in the winter. Bank erosion exists in the area even though the river along this stretch is forested by the management area on the south and The Little Sandy Hunting Club, an extremely natural bottomland that is in a U. S. Conservation easement easement, in law, the right to use the land of another for a specified purpose, as distinguished from the right to possess that land. If the easement benefits the holder personally and is not associated with any land he owns, it is an easement in gross (e.g. , located on its northeastern end.

The "Old Channel" is a smaller cut-off section of the Sabine River running somewhat parallel for 22 km. It meanders through the southern boundary of the OSBWMA for 18 km with a total fall of 0.2 m per km. It is structurally complex with numerous oxbows that may be up to 2.5 m in depth and narrow riffles that can be very shallow. The river feeds the Old Channel when the river level reaches 3.6 m and flow is approximately 28 CMS at the Mineola gauging station For the canal boat gauging or indexing station, see .
A Gauging station is a location used by hydrologists or environmental scientists to monitor and test terrestrial bodies of water.
. It is also fed by 5 large creeks and several springs so that it flows even during lower water levels. The average summer flow of the Old Channel where it crosses the main road into the OSBWMA is 0.7 CMS and in winter it averages 2.3 CMS.

The substrate in the river consists of sand and clay with large areas of silt and detritus detritus /de·tri·tus/ (de-tri´tus) particulate matter produced by or remaining after the wearing away or disintegration of a substance or tissue.

n. pl.
. The Old Channel has less silt but organic debris trapped by fallen trees is extensive in some areas. Although the banks of both the river and channel are lined with typical bottomland trees the waterways should receive some additional improvement over time as a 230 hectare pasture upstream acquired by TPWD in 2003 returns to native vegetation. This project provides a preliminary survey of the mussel fauna of the OSBWMA for future monitoring of species diversity and relative abundances.


Sampling techniques. -- Nine sites on the river and nine sites on the Old Channel were surveyed between June and September 2005. The waterway was first explored for shells and stream characteristics that were appropriate for mussels and when a site was located a timed hand search was initiated (Vaughn et al. 1997). A 40-m stretch was divided into 10 m sections and two persons searched the substrate for mussels for 15 to 20 minutes in each section. Both live and dead mussels were collected, identified and measured (shell length, width and height in mm), with one voucher of each species sent to the Stephen F. Austin State University Stephen F. Austin is one of four public universities in Texas not affiliated with a university system. Academics
Stephen F. Austin offers more than 120 areas of study, including more than 80 undergraduate majors, nearly 60 graduate degrees, and two doctoral programs. Stephen F.
 invertebrate invertebrate (ĭn'vûr`təbrət, –brāt'), any animal lacking a backbone. The invertebrates include the tunicates and lancelets of phylum Chordata, as well as all animal phyla other than Chordata.  collection. Any questionable specimens were sent to Robert Howells of TPWD for identification.

Data analysis. -- The general recommendations of Krebs (1998) were followed for measuring aspects of diversity. A Shannon-Wiener species diversity (H' base e) and evenness (J') were calculated for each waterway and the rarefaction rarefaction /rar·e·fac·tion/ (rar?i-fak´shun) condition of being or becoming less dense.

 method (James & Rathbun 1981) was used to calculate the expected number of species at comparable sample sizes. A Jaccard's coefficient of community was used to compare species similarity between watercourses (Brower et al. 1997).


A total of 477 individuals of 17 species was found during approximately 40 person-hours of sampling of the 18 sites (Table 1). Measurements of these 17 species of Unionids are given in Table 2. Three additional species were found at the OSBWMA during other surveys. A sampling during a mark-recapture study at site 5 in the Old Channel recorded one tapered pondhorn, Uniomerus declivis and one pond mussel, Ligumia subrostrata. A large number of pond mussels, was also found in one oxbow pool off the Old Channel. Valves of two flat floaters, Anodonta suborbiculata were found on the river but not at a sample site. The diversity indices for the Sabine River and the Old Channel were not significantly different (Old Channel richness adjusted to the sample size of the river = 13.15; 95% confidence limits of 12-14). However, differences in the species composing the assemblages were evident (C[C.sub.J] = 58.8%) and abundances for species in common were often different (Fig. 1). The river had half the total individuals found in the Old Channel and over 75% of those recorded were dead. Over half of those in the Old Channel were collected alive. The most obvious environmental difference between the river and the Old Channel was the erosion of the steep riverbanks. The banks of the Old Channel were less elevated and often were forested up to the water's edge. Although some silting was evident, erosion was restricted to shorter stretches of the waterway.

Abundances of all mussels were much lower than in comparable surveys in other east Texas rivers (Howells et al. 2000; Bordelon & Harrel 2004). The major substrates of the waterways of the OSBWMA are sand and clay, neither of which are excellent habitats for unionids. However, it is useful to discuss the abundances of each species relative to others in the two habitats with suggestions as to factors that may be involved in the numbers recorded.

Abundant species. -- Four species were found in at least five of the samples in the Sabine River (Table 1). Yellow sandshell, Lampsilis teres teres /te·res/ (te´rez) [L.] long and round.

Being round and long. Used of certain muscles and ligaments.


[L.] long and round.
, was present at eight of the nine river sites. However, it was even more common in the Old Channel (all nine samples, Fig. 1). Interestingly, a large percentage of the individuals in the Old Channel were recently dead. This species is susceptible to drought conditions "Drought Conditions" is episode 126 of The West Wing. Plot
Senator Rafferty, a new presidential candidate garnered much media attention with a ground-breaking speech about health care.
 (Howells et al. 1996) but even individuals found underwater were often dead. The valves were nearly always of large adults so possibly the high number was the result of natural senescence senescence /se·nes·cence/ (se-nes´ens) the process of growing old, especially the condition resulting from the transitions and accumulations of the deleterious aging processes.

 in this fast growing species (Howells et al. 1996). Washboard, Megalonaias nervosa, was also abundant in the river but never found alive. Erosion of the riverbanks was common in all sites and often the valves of this species were found buried. Some live individuals have been found in nearby sections of the Sabine River, but our data suggests the species may be extirpated in the river bordering the OSBWMA. Fragile papershell, Leptodea fragilis, was found in most sites in both the river and the Old Channel and this may be because it is a species that can tolerate silting (Buchanan 1980). Bleufer, Potamilus purpuratus, was found in five sites on the river and most of these were live specimens. This species was also relatively abundant in the Old Channel with 14 live specimens recorded. Several other species were found in at least five sites in the Old Channel including Louisiana fatmucket, Lampsilis hydiana, and bankclimber, Plectomerus dombeyanus, which were rare in the river (Fig. 1). Additionally, giant floater, Pyganodon grandis; southern mapleleaf, Quadrula apiculata; western pimpleback, Q. mortoni; and pistolgrip, Q. (=Tritogonia) verrucosa, were each found in two or three sites in the river (Table 1).


Uncommon species. -- Eight species were found in less than five sites in both habitats. This includes threeridge, Amblema plicata, which was only found dead in three sites on the river. This species was once abundant enough in the Sabine River to support a commercial harvest (Howells et al. 1996), and overharvesting may have caused its apparent decline. Rock-pocketbook, Arcidens confragosus, was found in small numbers in both the river and the channel. This species is not rare in eastern Texas but is generally found in limited numbers where it occurs (Howells et al. 1996). Threehorn wartyback, Obliquaria reflexa, was only found in two sites in the river of which one had six individuals and deertoe, Truncilla truncata, was only found in three sites in the river. These two species were abundant in other nearby sites on the river. Texas lilliput, Toxolasma texasensis: pondhorn, Uniomerus tetralasmus: and little spectaclecase, Villosa lienosa, were only found in the Old Channel. Little spectaclecase was found in three sites while only one Texas lilliput and three pondhorns at one site were found. The latter species is known to occur in large numbers in ponds (Howells et al. 1996) and a pool isolated off the Old Channel did have a large number of pondhorns.

In this study, 58% of the species of mussels previously recorded in the Sabine River were found. This suggests the waters bordering and within the OSBWMA support a diverse bivalve bivalve, aquatic mollusk of the class Pelecypoda ("hatchet-foot") or Bivalvia, with a laterally compressed body and a shell consisting of two valves, or movable pieces, hinged by an elastic ligament.  fauna. However, some other studies of mussels in east Texas rivers have samples much higher than in this report and other sites on the Sabine River outside the OSBWMA had much higher densities of unionids. None of the species recorded in either of these habitats appeared to be abundant and the lack of optimal substrate is likely the main cause. However, anthropogenic an·thro·po·gen·ic  
1. Of or relating to anthropogenesis.

2. Caused by humans: anthropogenic degradation of the environment.
 impacts that are known to affect freshwater mussels are evident in the area, such as sand and silt deposition from upstream, and erosion of banks. In addition, during this very dry summer, damage to the banks and substrate of the channel from wild hogs was evident. The waterways of the OSBWMA go through bottomland forest habitat and the impacts of agriculture should be limited. It would be useful to monitor recruitment of young in the unionid fauna at the OSBWMA to determine if individual species are recovering or declining.


The authors thank Texas Parks and Wildlife Department for permission to work on the OSBWMA. We thank Robert G. Howells and Lyubov E. Burlakova for confirming species identifications and Robert Howells, Kevin Herriman and Shaun Crook for reviewing drafts of this manuscript. Voucher specimens have been deposited at the Stephan F. Austin State University invertebrate collection. The Ed and Mary Heath Foundation and the Rosa May Griffin Foundation helped with travel expenses.


Bechtel, H. J. 1940. Freshwater mussels of East Texas. M. A. Thesis, Stephen F. Austin Stephen Fuller Austin (November 3, 1793 – December 27, 1836), known as the "Father of Texas," led the second and ultimately successful colonization of the region by the United States. The capital city of Austin, Texas, Austin County, Texas, Stephen F.  State Teachers College, Nacogdoches, Texas Nacogdoches (pronounced [ˌnæːkə̆ˈdoʊtʃɪs]) is a city in Nacogdoches County, Texas, in the United States. As of the 2000 census, the city population was 29,914. . 38 pp.

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  • Village Creek (Allamakee County, Iowa) an immediate tributary of the Upper Mississippi River.
 Drainage Basin drainage basin: see catchment area.  in southeast Texas. Texas J. Sci. 56(1):63-72.

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Jefferson City is the capital of the State of Missouri and the county seat of Cole County.
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Howells, R. G., C. M. Mather & J. A. M. Bergmann. 2000. Impacts of dewatering and cold on freshwater mussels (Unionidae) in B. A. Steinhagen Reservoir, Texas. Texas J. Sci., 52(4):93-104.

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Layzer, J. B., M. E. Gordon & R. M Anderson. 1993. Mussels: the forgotten fauna of regulated rivers: a case study of the Caney Fork River The Caney Fork River is one of the major streams draining the Cumberland Plateau region of Tennessee and a major tributary of the Cumberland River system.

The Caney Fork rises in Cumberland County about six miles (10 km) west north-west of Crossville. It is crossed by U.S.
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defining the location and numbers of animal populations, and their variability with time.
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Neves, R.J., A.E. Bogan, J.D. Williams., S.A. Ahlstedt & P.W. Hartfield. 1997. Status of the aquatic mollusks in the southeastern United States: a downward spiral of diversity. Pages 43-86 In G.W. Benz & D.E. Collins. Aquatic Fauna in Peril: The Southeastern Perspective. Special Pub. 1., Southeast Aquatic Research Inst., 554 pp.

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Vaughn, C. C., C. M. Taylor & K. J. Eberhard. 1997. A comparison of the effectiveness of timed searches vs. quadrat quad·rat  
1. Printing A piece of type metal lower than the raised typeface, used for filling spaces and blank lines. Also called quad2.

 sampling in mussel surveys. Pages 157-162, in Cummings, K.S., A.C. Buchanan, C.A. Mayer and T.J. Naimo., Conservation and Management of Freshwater Mussels II: Initiatives for the Future. Upper Miss. R. Conser. Comm., St. Louis, 189 pp.

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Department of Biology

University of Texas at Tyler History
The University of Texas at Tyler was originally founded in 1971 as Tyler State College. It was renamed Texas Eastern College in 1975, and then joined the University of Texas System in 1979.

Tyler, Texas 75799
Table 1. Number of living/dead individuals of mussel species collected
at sites in the Sabine River and Old Channel and at the Old Sabine
Bottom Wildlife Management Area, Smith County, Texas.

                                          Sabine River Site
Species                       1    2    3     4     5     6    7    8

Amblema plicata               0/0  0/0  0/1   0/0   0/1   0/2  0/0  0/0
Arcidens confragosus          0/0  0/0  0/0   0/0   1/0   0/0  0/0  0/0
Lampsilis hydiana             0/0  0/0  0/1   0/0   0/0   0/0  0/0  0/0
Lampsilis teres               0/1  0/1  0/0   1/0   1/1   0/1  0/1  3/2
Leptodea fragilis             2/1  0/2  0/1   1/5   0/1   0/4  1/1  0/0
Megalonaias nervosa           0/7  0/1  0/22  0/25  0/17  0/9  0/4  0/1
Obliquaria reflexa            0/0  0/0  0/0   0/0   0/0   6/0  1/0  0/0
Plectomerus dombeyanus        0/0  0/0  0/0   0/0   0/0   0/0  0/0  0/0
Potamilus purpuratus          0/0  0/0  1/0   2/0   0/0   2/0  0/0  0/1
Pyganodon grandis             0/0  0/0  0/0   0/0   0/4   1/0  0/0  0/0
Quadrula apiculata            0/0  0/0  0/0   2/1   0/0   0/2  0/0  0/0
Quadrula mortoni              0/0  0/0  0/0   0/0   0/3   0/5  0/1  0/0
Quadrula verrucosa            0/0  1/0  0/0   0/0   0/2   0/0  0/0  0/0
Toxolasma texasensis          0/0  0/0  0/0   0/0   0/0   0/0  0/0  0/0
Truncilla truncata            0/0  0/0  0/0   1/0   0/0   2/0  0/0  2/0
Uniomerus tetralasmus         0/0  0/0  0/0   0/0   0/0   0/0  0/0  0/0
Villosa lienosa               0/0  0/0  0/0   0/0   0/0   0/0  0/0  0/0
Total abundance (live/dead)
Species richness
Shannon Diversity index (In)

                                    Sabine River Site
Species                       9    Totals  No. sites present

Amblema plicata               0/0   0/4    3
Arcidens confragosus          0/0   1/0    1
Lampsilis hydiana             0/0   0/1    1
Lampsilis teres               0/2   5/9    8
Leptodea fragilis             0/3   4/18   8
Megalonaias nervosa           0/0   0/86   8
Obliquaria reflexa            0/0   7/0    2
Plectomerus dombeyanus        0/0   0/0    0
Potamilus purpuratus          1/0   6/1    5
Pyganodon grandis             0/0   1/4    2
Quadrula apiculata            1/0   3/3    3
Quadrula mortoni              0/0   0/9    3
Quadrula verrucosa            0/0   1/2    2
Toxolasma texasensis          0/0   0/0    0
Truncilla truncata            0/0   5/0    3
Uniomerus tetralasmus         0/0   0/0    0
Villosa lienosa               0/0   0/0    0
Total abundance (live/dead)        33/137
Species richness                   13
Shannon Diversity index (ln)        1.78
Evenness                            0.69

                                       Old Channel Sites
Species                      1      2    3     4     5    6    7

Amblema plicata               0/0   0/0   0/0   0/0  0/0  0/0  0/0
Arcidens confragosus          1/0   0/0   0/0   0/0  0/0  0/0  0/1
Lampsilis hydiana             3/4   0/2   3/0   0/0  1/0  4/0  1/0
Lampsilis teres               4/15  0/2   0/4  23/5  7/8  5/1  5/27
Leptodea fragilis             0/2   0/0   0/1   0/3  1/3  2/0  0/1
Megalonaias nervosa           0/0   0/0   0/0   0/0  0/0  0/0  0/2
Obliquaria reflexa            0/0   0/0   0/0   0/0  0/0  0/0  0/0
Plectomerus dombeyanus       10/3   0/2  11/1   4/0  0/1  0/0  7/2
Potamilus purpuratus          0/0   0/0   0/1   9/3  3/1  0/0  1/1
Pyganodon grandis             0/0   0/0   0/0   0/0  0/1  0/1  0/2
Quadrula apiculata            6/0   1/0   4/0   4/0  1/0  0/0  4/0
Quadrula mortoni              1/0   0/0   2/0   0/0  0/2  0/0  0/2
Quadrula verrucosa            3/0   2/2   3/0   6/2  0/0  0/0  0/1
Toxolasma texasensis          0/0   0/0   0/0   0/0  0/1  0/0  0/0
Truncilla truncata            0/0   0/0   0/0   0/0  0/0  0/0  0/0
Uniomerus tetralasmus         0/0   0/0   0/0   0/0  0/0  0/0  0/0
Villosa lienosa               0/0   0/2   0/0   0/2  0/1  0/0  0/0
Total abundance (live/dead)
Species richness
Shannon diversity index

                                     Old Channel Sites
Species                      8     9    Totals   No. sites present

Amblema plicata              0/0   0/0    0/0    0
Arcidens confragosus         0/1   0/0    1/2    3
Lampsilis hydiana            0/0   0/0   12/6    6
Lampsilis teres              5/14  5/5   54/81   9
Leptodea fragilis            1/1   0/2    4/13   8
Megalonaias nervosa          0/0   0/0    0/2    1
Obliquaria reflexa           0/0   0/0    0/0    0
Plectomerus dombeyanus       0/0   2/0   34/9    7
Potamilus purpuratus         1/1   0/0   14/7    5
Pyganodon grandis            0/1   0/5    0/10   5
Quadrula apiculata           1/0   0/0   21/0    7
Quadrula mortoni             0/0   0/1    3/5    5
Quadrula verrucosa           1/0   0/0   15/5    6
Toxolasma texasensis         0/0   0/0    0/1    1
Truncilla truncata           0/0   0/0    0/0    0
Uniomerus tetralasmus        0/0   1/2    1/2    1
Villosa lienosa              0/0   0/0    0/5    3
Total abundance (live/dead)             159/148
Species richness                         14
Shannon diversity index                   1.92
Evenness                                  0.73

Table 2. Measurements of Unionid mussels collected at the Old Sabine
Wildlife Management Area. Mean [+ or -] SD (minimum-maximum).

Species                 Length (mm)          Width (mm)

Amblema plicala          76.3 [+ or -] 9.2    59.5 [+ or -] 63.5
                         (63-83)              (51-66)
Arcidens confragosus     93.0 [+ or -] 34.1   69.3 [+ or -] 20.9
                         (57-139)             (45-96)
Lampsilis hydiana        63.7 [+ or -] 15.3   40.2 [+ or -] 9.8
                         (34-87)              (21-54)
Lampsilis teres          94.1 [+ or -] 20.1   44.4 [+ or -] 9.2
                         (15-124)             (10-63)
Leptodea fragilis        85.4 [+ or -] 17.6   53.0 [+ or -] 10.9
                         (47-122)             (27-72)
Megalonaias nervosa     160.5 [+ or -] 43    106.3 [+ or -] 29.5
                        (68-220)             (44-158)
Obliquaria reflexa       37.9 [+ or -] 6.5    30.4 [+ or -] 7.0
                         (28-45)              (20-39)
Plectomerus dombeyanus   91.6 [+ or -] 14.9   60.9 [+ or -] 11.8
                         (47-120)             (27-84)
Potamilus purpuratus     90.4 [+ or -] 36.0   58.3 [+ or -] 23.2
                         (45-166)             (27-100)
Pyganodon grandis        89.3 [+ or -] 15.9   53.7 [+ or -] 9.1
                         (566-122)            (39-68)
Quadrula apiculala       54.3 [+ or -] 8.3    45.7 [+ or -] 7.4
                         (37-71)              (28-56)
Quadrula mortoni         52.6 [+ or -] 9.8    43.9 [+ or -] 7.7
                         (22-64)              (19-52)
Quadrula (=Tritogonia)  109.2 [+ or -] 25.5   62.9 [+ or -] 12.5
  verrucosa             (50-142)              (28-97)
Toxolasma texasensis     33.0                  1.7
Truncilla truncala       35.6 [+ or -] 12.6   29.6 [+ or -] 7.7
                         (20-49)              (18-38)
Uniomerus tetralasmus    91.0 [+ or -] 4.6    46.0 [+ or -] 1.7
                         (87-96)              (45-48)
Villosa lienosa          55.8 [+ or -] 10.7   31.8 [+ or -] 6.2
                         (42-66)              (24-40)

Species                 Height (mm)

Amblema plicala         38.3 [+ or -] 58.0
Arcidens confragosus    59.8 [+ or -] 53.4
Lampsilis hydiana       29.3 [+ or -] 9.2
Lampsilis teres         31.0 [+ or -] 8.3
Leptodea fragilis       31.1 [+ or -] 6.5
Megalonaias nervosa     69.7 [+ or -] 23.3
Obliquaria reflexa      16.3 [+ or -] 3.6
Plectomerus dombeyanus  35.5 [+ or -] 16.0
Potamilus purpuratus    39.7 [+ or -] 18.5
Pyganodon grandis       41.4 [+ or -] 7.0
Quadrula apiculala      28.6 [+ or -] 5.8
Quadrula mortoni        32.1 [+ or -] 7.1
Quadrula (=Tritogonia)  34.7 [+ or -] 10.2
  verrucosa             (12-32)
Toxolasma texasensis     1.2
Truncilla truncala      19.4 [+ or -] 4.6
Uniomerus tetralasmus   29.3 [+ or -] 2.3
Villosa lienosa         19.0 [+ or -] 5.2
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Author:Ford, Neil B.; Nicholson, Melissa L.
Publication:The Texas Journal of Science
Geographic Code:1U7TX
Date:Aug 1, 2006
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