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36 <br /> <br />Most of the special status plant and animal species listed in Table 2 are either presumed absent <br />from or unlikely to occur on the site due to a lack of suitable habitat, or existence of very <br />marginal habitat; while others would be considered to occur only rarely or occasionally on the <br />site to forage. Sufficient information exists to evaluate the potential impacts the project may or <br />may not have on these latter species. However, several species warrant a more in-depth <br />discussion due to their potential to occur on the site and/or their legal status. These latter species <br />include the Callippe silverspot butterfly, California tiger salamander (CTS), burrowing owl <br />(BUOW), and American badger. These latter species are discussed in greater detail below. <br />Callippe Silverspot Butterfly (Speyeria callippe callippe). Federal listing status: <br />Endangered; State listing status: None. <br />The Callippe Silverspot butterfly (Speyeria callippe callippe: Lepidoptera: Nymphalidae) was <br />recognized as an endangered species in 1997 (U.S. Fish & Wildlife Service [USFWS] <br />1997). Although there are numerous subspecies within this widely distributed species, only the <br />subspecies S. callippe callippe is protected under federal law. <br />Like many of the described subspecies of this silverspot species, Speyeria callippe callippe <br />exhibits considerable phenotypic variation in its color, wing markings (maculations), and the <br />amount of black scaling. Individuals of S. callippe callippe exhibit the following features: <br />a) dorsal forewings with thick, dark veins in males and prominent black maculations; <br />b) dorsal wings with pale yellow-orange ground color with an extensive black, sooty- <br />appearing suffusion in the basal area of the forewings and hindwings; <br />c) ventral forewings with extensive reddish color in males; <br />d) ventral hindwings with a brown disc covered with yellow suffusion. <br />A closely related subspecies, S. callippe comstocki, differs from typical S. callippe callippe by <br />exhibiting a reduced basal suffusion of black, sooty-appearing scales on the dorsal wings, mostly <br />yellow color on the ventral forewings of males, and a mostly yellow disc. A few subspecies lack <br />the silver spots that give this species its common name. Both subspecies of Speyeria callippe