MALE AND EPHIPPIAL FEMALE DAPHNIA-JOLLYI PETKOVSKI, 1973 DISCOVERED IN WESTERN-AUSTRALIA AND THE PARTHENOGENETIC FEMALE REDESCRIBED

The rediscovery of Daphnia jollyi Petkovski 1973 in Western Australia has allowed a more complete description of the female and has extended the known range of the species within Western Australia. One populati on had males and ephippial females, making possible the first descript ion of the resting eggs, and male characteristics. The fringe of setae on the mid-region of the margin of the carapace in the female, though t to suggest a close relationship with Daphnia obtusa, is a primitive character shared with other genera in the Daphniidae, and which, there fore, does not provide sound information on relationships within the s ubgenus. Unique characteristics displayed in the ephippium (such as it s sub-rectangular shape and the orientation of large egg chambers set at an angle to the dorsal margin of the carapace), and right angled ma rgins of the fornices, that make it difficult to determine the precise affinities of D. jollyi within the subgenus Daphnia. This unique char acter set, and the species' relict distribution in a region of high an d ancient endemicity, suggests D. jollyi may represent a separate and ancient lineage within the subgenus, presently found only in granite r ock pools of slightly acid pH (6.0-6.5) in a restricted region of sout h-western Australia.