. Bonner zoologische Monographien. Zoology. 60 Finrays in the dorsal and anal fins A similar result is obtained from the comparison of meristic characters, the variability of finrays in the dorsal and anal fins, which do not differ significantly neither within the four northern Chilean "species" (inclusive the Huasco- population: Thomann 1990) nor between the latter and O. agassizii from different parts of its range (Lauzanne 1982 and own collections: Villwock & Sienknecht 1993). The average values of the dorsal fin (D) range from (Lauca) to (Chungarä); the average
. Bonner zoologische Monographien. Zoology. 60 Finrays in the dorsal and anal fins A similar result is obtained from the comparison of meristic characters, the variability of finrays in the dorsal and anal fins, which do not differ significantly neither within the four northern Chilean "species" (inclusive the Huasco- population: Thomann 1990) nor between the latter and O. agassizii from different parts of its range (Lauzanne 1982 and own collections: Villwock & Sienknecht 1993). The average values of the dorsal fin (D) range from (Lauca) to (Chungarä); the average values for the anal fin (A) range from (d'Ascotan) to (Chungarä and Huasco). These values are again within the normal distribution of O. agassizii sensu Lauzanne (1982). Scales and scalation The number of scales and the degree of scalation are no useful characters for species discrimination since scale reductions occur in all orestiine cyprinodonts. Moreover, scales show a high variability in counts (and size) within the same popu-. : Different stages of scale development (alizarine-S- staining) a: TL 18-19mm; b: TL 20- 21mm; c: TL 25-26mm (Liissen 1998). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bonn, Zoologisches Forschungsinstitut und Museum Alexander Koenig
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectzoology
