. The Canadian field-naturalist. 2000 Note 333 Three Records of the Chestnut Lamprey, Ichthyomyzon castaneus. New to Quebec Claude B. Renaud and Naomi de Ville Research Division, Canadian Museum of Nature, Box 3443, Station D, Ottawa, Ontario KIP 6P4 Renaud, Claude B., and Naomi de Ville. 2000. Three records of the Chestnut Lamprey, Ichthyomyzon castaneus, new to Quebec. Canadian Field-Naturalist 114(2): 333-335. We report on the presence of the parasitic Chestnut Lamprey, Ichthyomyzon castaneus, in Quebec based on three speci- mens from three localities spanning a distance of over 400 km
. The Canadian field-naturalist. 2000 Note 333 Three Records of the Chestnut Lamprey, Ichthyomyzon castaneus. New to Quebec Claude B. Renaud and Naomi de Ville Research Division, Canadian Museum of Nature, Box 3443, Station D, Ottawa, Ontario KIP 6P4 Renaud, Claude B., and Naomi de Ville. 2000. Three records of the Chestnut Lamprey, Ichthyomyzon castaneus, new to Quebec. Canadian Field-Naturalist 114(2): 333-335. We report on the presence of the parasitic Chestnut Lamprey, Ichthyomyzon castaneus, in Quebec based on three speci- mens from three localities spanning a distance of over 400 km. Key Words: Chestnut Lamprey, Ichthyomyzon castaneus, Petromyzontidae, distribution, Quebec. Renaud et al. (1996) reported on the widespread but rare occurrence of the Chestnut Lamprey, Ichthyomyzon castaneus, in the province of Ontario. Given the fact that some of the Chestnut Lamprey from Ontario had been misidentified as the more common Silver Lamprey, Ichthyomyzon unicuspis, a complete check of the extensive collections of the latter species from the province of Quebec, housed at the Canadian Museum of Nature (CMN), needed to be undertaken. We have rehed on a single tooth character to sepa- rate the Chestnut and Silver lampreys. Additionally, the number of trunk myomeres was determined fol- lowing Hubbs and Trautman (1937). Tooth nomen-. Lateral Circumorals (=Endolaterals) Posterior Circumorals Figure 1. Oral disc of a Silver Lamprey. The circumorals, as defined by Hubbs and Potter (1971), are labeled. The lateral circumorals correspond to the endolater- als of Vladykov and Follett (1967). Note the absence of bicuspid endolaterals. Modified from Vladykov and Kott (1980) with permission from the Canadian Journal of Fisheries and Aquatic Sciences. clature follows Vladykov and Follett (1967) and Hubbs and Potter (1971). According to Hubbs and Trautman (1937), the two parasitic species are distin- guishable from each other by the number of bicuspid circumorals (Figure 1) they
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