lamprey

denticulata were: chelipeds (10.3 [+ or -] 5.0 mm), carapace length (22.3 [+ or -] 5.6 mm), carapace width (19.6 [+ or -] 4.5 mm) and body length (29.0 [+ or -] 8.5 mm) and, for 17 specimens of ammocoetes in larval stages of G.

denticulata upon Geotria ammocoetes occurred in a confined unnatural space but the very fact of its occurrence points to the aeglids carnivorous capacity.

Predatory behavior of Aegla denticulata upon the ammocoetes larval stage of the lamprey Geotria australis in a confined environment.

Kostow (1) reported outmigration of Pacific lamprey (often mixtures of ammocoetes and juveniles) during fall, winter, and spring at locations throughout the Columbia River basin.

This information is especially needed to avoid misidentification of early life stages of lampreys in the field (Mesa and Copeland, 2009), given the often incorrect assumption that all juvenile lampreys are Pacific lamprey (Kostow (1); Mesa and Copeland, 2009) and the difficulties of identifying small ammocoetes to species (Goodman et al., 2009).

Morphological diagnosis of Entosphenus and Lampetra ammocoetes (Petromyzontidae), in Washington, Oregon, and California.

All American brook lampreys identified during this study were ammocoetes. No adults would have been present during the time of year collections were made since adult American brook lampreys spawn and die during the spring (Cochran et al.

Earlier reports (Marenchin & Sever 1981, and references therein), however, suggested that ammocoetes collected in Christiana Creek and Turkey Creek might be northern brook lampreys.

In addition to chestnut lamprey, Ichthyomyzon ammocoetes were observed at all three sites, and one larval L.