. The Canadian field-naturalist. 1993 Holm and Houston: Status of the Ghost Shiner 441. Figure 1. Ghost Shiner, Notropis buchanani, from Thames River (Royal Ontario Museum 36439), 45 mm TL. Drawn by Anker Odum. each side of the lateral line and, posteriorly, a line of melanophores along the midlateral surface extending to the caudal base. Ventrally, melanophores occur along each side of the anal base and a row of melanophores is present on the lower surface of the caudal peduncle. At the base of the caudal fin, there is often a lightly pigmented bar. The first two outer rays of both the upper
. The Canadian field-naturalist. 1993 Holm and Houston: Status of the Ghost Shiner 441. Figure 1. Ghost Shiner, Notropis buchanani, from Thames River (Royal Ontario Museum 36439), 45 mm TL. Drawn by Anker Odum. each side of the lateral line and, posteriorly, a line of melanophores along the midlateral surface extending to the caudal base. Ventrally, melanophores occur along each side of the anal base and a row of melanophores is present on the lower surface of the caudal peduncle. At the base of the caudal fin, there is often a lightly pigmented bar. The first two outer rays of both the upper and lower caudal lobe are clear but the rest of the caudal is usually speckled with numerous melanophores. Breeding males become densely tuberculate on the top of the head, nape, and snout. The tubercles may also be evident on rays two to seven of the pectoral fins. Its tuber- cles are larger and greater in number on the top of the head than in Notropis volucellus but, unlike that species, it lacks tubercles below the eyes and on the underside of the head (Cross 1967). Taxonomic Considerations The taxonomy of Notropis buchanani Meek and related species has been very confused. Originally described in 1896, it was later regarded as a syn- onym of Notropis blennius (Girard) and then of Notropis deliciosus (Girard) [= Notropis stramineus (Cope)]. Hubbs and Greene (1928) reduced buchanani to subspecific level, representing south- em populations of Notropis volucellus (Cope) which is currently considered by some to be a complex of more than one species (Smith 1979; Trautman 1981). Taylor {in Bailey 1951) noted that Notropis buchanani lacked an infraorbital canal and it was subsequently returned to full species status. Distribution The Ghost Shiner occurs in the Mississippi River drainage and Gulf of Mexico drainages west of the Mississippi (Figure 2, inset). It occurs in Gulf of Mexico drainages as far south as the lower Rio Grande in Mexico and Texas and, in the Mississippi drainage
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