File:American malacological bulletin (1987) (17535618693).jpg

Title: American malacological bulletin
Identifier: americanmal4519861987amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Fig. 3. Examples of right (A.) and left (B.) valves of Ouadrula sparsa from the CRBRP Site illustrating variation in pustule arrangement. The specimens of Quadrula metanevra (C.) encountered in the CRBRP site molluscan sample. adjacent to the site must have supported a rich and varied naiad fauna with individuals of the Pleurobema group and those of the following species comprising about one third of the population. Actinonaias ligamentina (Lamarck, 1819): Slightly over 3,200 shells of the common Mucket were identified, the largest number for any single species recorded from the CRBRP site. Nearly 1,700 individuals were represented and their shells comprised 13.5% of all valves recovered. Today the Mucket is still one of the most common naiads in the unim- pounded Clinch River above the Norris Reservoir. During the various periods this site was occupied, A. ligamentina must also have occurred abundantly in the shoal areas of the lower Clinch River. Because of the close similiarity in shell charact- ers between this species and the Pink Mucket (Lampsilis orbiculata (Hildreth, 1828)), especially in the males, a few of the valves recorded as A. ligamentina may be those of the Pink Mucket. Epioblasma arcaeformis (Lea, 1831): The Sugar Spoon was once widespread throughout the Tennessee and Cumberland River systems, but it has not been collected in over 50 years and is presumed extinct (Stansbery, 1970). In addition to inhabiting small tributary streams, it occurred on shoals of the larger rivers such as the Tennessee and lower Clinch. Over 900 valves of £. arcaeformis were recovered in the CRBRP site samples with both juveniles and old adults being represented. All species of Epioblasma iden- tified from the site are relatively small mussels. However, as in the case of nearly all species represented in the samples, small juveniles as well as large adults were collected, so it would appear that the Indian was not selective as to the size of individuals (or species) utilized. Epioblasma brevidens (Lea, 1831): Of the 10 species and/or forms of Epioblasma represented in the CRBRP site samples, valves of E. brevidens were the most numerous (1,088). This mussel is still common locally in the upper Clinch and Powell rivers but, like many of the smaller species former- ly found in shoal and bar areas of big rivers, it has disap- peared in the impounded stretches. Shells of all species of Epioblasma identified from the site numbered nearly 3,400 and comprised 14% of the total. Epioblasma capsaeformis (Lea, 1834): Ortmann (1925) stated that this species is ". . . apparently as abun- dant in the lower Tennessee drainage as in the upper, both in larger and smaller streams." It apparently was not numerous in the shoal area adjacent to the site as only 84 valves were recovered. Identification of several of these closely related

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