slightly shorter than labial segment I and almost as long as distance between buccula
to pronotum (Fig.
Current status of Notropis buccula
and Notropis oxyrhynchus in Texas.
At the initiation of this study, two changes in the assemblage were expected: (1) the extirpation of the obligate riverine species Notropis buccula and Hybognathus placitus, which were believed to be unable to maintain permanent populations upstream from the impoundment in the absence of periodic immigration from downstream sites; and (2) a decline in relative abundance and species richness of minnows (family Cyprinidae), compared with pre-impoundment collections, as a result of the loss of N.
Notropis buccula and Hybognathus placitus comprised less than 1% of the fish assemblage following impoundment of Lake Alan Henry.
Head: vertex and clypeus pale with sparse brown or red dots, transverse fasciae orange, base and apex of clypeus brown, mandibular plate red with dorsal pale spot, maxillary plate red, gena pale and slightly suffused with red; buccula
and gula whitish; antennal segments as in genetic description; labium as in generic description.
Head and thorax brown, buccular and genal regions reddish brown, first and second labial segments pale, third segment brown, membranous areas between buccula
and first segment, first and second segment, and truncate tip of third segment whitish; scape and pedicel pale, basiflagellomere and distiflagellomere slightly darker (Fig.
2A, B); buccula
shorter than gula; gena elongate; gula about the same length as postocular region; eyes removed from anterior margin of pronotum, located approximately on longitudinal midpoint of head (Figs.