INTERNATIONAL STUDY ON ARTEMIA - LIII - MORPHOLOGICAL-STUDY OF ARTEMIA WITH EMPHASIS TO OLD-WORLD STRAINS - I - BISEXUAL POPULATIONS

A detailed morphological and allometrical study was performed with adu lt males and females of eleven bisexual populations of brine shrimp Ar temia. Multivariate procedures, discriminant and cluster analysis, all owed to separate and group together populations which exhibit great ge netic similarities. The eleven populations studied form four distinct groups: the A. franciscana group, the A. tunisiana group, the A. urmia na group and a broader group which includes Eastern Old World populati ons. Scanning electron microscopy revealed differences in the male gen ital organs of an A. tunisiana population by lacking a medial protuber ance in the base of the penes while the pattern of the ectodermal ridg es of the brood pouch of A. urmiana markedly differed from the other p opulations studied.