Key to the Species of Pteronotropis

2a. (From 1b.) Dorsal, caudal, anal, and pelvic fins with distinct distal orange-red band and yellow base; basicaudal spots bright yellow; distal tip of anterior dorsal fin rays pigmented; circumferential scales usually 23 to 24.
flagfin shiner

Pteronotropis signipinnis

2b. (From 1b.) Dorsal, caudal, anal, and pelvic fins without distinct distal orange-red band and yellow base; caudal fin red-orange with distinct red basicaudal spots; distal tip of anterior dorsal fin rays clear; circumferential scales usually 27 to 30.

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