Gravel chub (Erimystax x-punctatus) COSEWIC assessment and status report: chapter 4

Distribution

Global range

The gravel chub is found in east-central North America where it has a disjunct distribution (Figure 2), occurring from south-central Arkansas north to southern Minnesota and east to southern Ontario and western New York. The subspecies E. x. trautmani is limited to the Ohio River basin in Illinois, Indiana, Ohio, New York, Pennsylvania and Kentucky, and the Thames River, Ontario.

Figure 2. Global distribution of the gravel chub.

Figure 2. Global distribution of the gravel chub.

Canadian range

In Canada, this species was known only from the Thames River of southwestern Ontario, approximately 300 km from the nearest American records in Ohio (Figures 2 and figure3). Last documented extant in 1958, all subsequent attempts to collect individuals of this species have been unsuccessful. The known extent of occurrence would have been less than 200 km², and the area of occupancy would have been less than 20 km², measured directly by aquatic habitat occupied, or less than 100 km² by application of a 1 km² grid (see COSEWIC 2007).

Figure 3. Former Canadian distribution ofthe gravel chub.

Figure 3. Former Canadian distribution ofthe gravel chub.

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