Trinity Pigtoe Sample Clauses

Trinity Pigtoe. The Mussels of Texas database (Xxxxxxxx et al., 2020) describes the Trinity Pigtoe as follows: Shell structure is moderately thin to thick, inflated; outline subtriangular to subrhomboid; posterior ridge high, sharp or narrowly rounded, ends at a blunt point, may show a second or third ridge; sulcus present anterior to the posterior ridge; posterior slope steep and slightly concave with 2 wrinkle-like lines extending from the umbo to the margin. Shell color is xxxxxxx-xxxxx, greenish-brown, or brown; may present green or brown rays; surface usually dull to subglossy. Shell is smooth with an inner nacre color that is usually white but can have salmon or rose highlights, some may show brassy blotches; iridescent posteriorly. The Trinity Pigtoe was recently distinguished as genetically separate from Texas Pigtoe (Fusconaia askewi) and Triangle Pigtoe (Fusconaia lananensis), and has a distribution restricted to the Trinity Basin, specifically in the mainstem of the Trinity River near Dallas-Fort Worth downstream to just above Lake Xxxxxxxxxx and adjacent tributaries (Inoue et al., 2018; Xxxxx et al., 2018). The Trinity Pigtoe is morphologically difficult to distinguish between other types of Pigtoe including the Wabash Pigtoe (Fusconaia flava), which is widely distributed throughout the Eastern United States and also occurs in the Trinity River Basin (Xxxxx et al., 2018). In the absence of genetic verification, problems with misidentification can lead to confusion about the status and distribution of the species (Xxxxxxx, 2014; Xxxxx et al., 2018). The species is currently classified as threatened by the Texas Parks and Wildlife Department (TPWD) but is not currently under review by the USFWS for potential listing under the ESA. Most habitat, host, and reproduction characteristics are similar to other Pigtoe species that occur in Texas. Habitat is thought to include streams and rivers, but the Trinity Pigtoe is not known to inhabit reservoirs. It can be found in nearshore habitats, such as banks and backwaters, but is most common in main channel habitats, such as riffles and runs. Preferred substrates include mud, sand, gravel, and cobble or a mix thereof in moderate to swift currents (Xxxxxxxx et al., 2017). Trinity Pigtoe appears to be intolerant of flow alteration and poor water quality and is believed to have a maximum life expectancy of 45 years (Xxxxxxxx et al., 2017). Host fish are unknown but likely include hosts of other Pigtoe species, such as Red Sh...