Morphometric comparison of two bisexual species of Artemia: Artemia franciscana Kellogg, 1906 from Mexico and Artemia urmiana Günther, 1899 from Lake Urmia

Document Type : Primary Research paper



Inland waters Artemia populationshave specific biological characteristics, due to isolation pattern in their habitat environment. These populations mainly have different ionic compositions in the living environment which is actually described their biological characteristics. Owing to this reason, two bisexual species of Artemia from different geographical locations were selected in order to determine morphological variabilities within and among populations. The two species are A. franciscana from Mexico containing four populations and A. urmiana from Lake Urmia, Iran. Morphological variations were carried out based on cyst and decapsulated cyst diameter, nauplii and adults (males and females) length. Biometry of A. urmiana cysts showed bigger size than Mexican cysts. A. urmiana nauplii length showed significant outcome with all Mexican populations with the exception of Cuatro Cienegas. Morphometric analysis of adult Artemia did not show significant differences in some variable parameters. Analysis of males and females gave principally discriminant variables in three parameters including head width, distances between compound eyes and length of furca.