REDESCRIPTION OF ALONELLA PULCHELLA HERRICK, 1884 (CLADOCERA, CHYDORIDAE), AND A DESCRIPTION OF THE MALE BY BRENDA J. HANN and R. CHENGALATH Invertebrate Zoology Division, National Museum of Natural Sciences, Ottawa, Ontario, Canada K1A 0M8 INTRODUCTION The North American taxa grouped in the genus Alonella are highly variable, and careful comparisons are underway with European material to examine the equivalence of the taxa when the same species is thought to occur on both con- tinents. Where once many chydorid species were believed to be cosmopolitan, recent investigations of Alonopsis (cf. Kubersky, 1977), Chydorus sphaericus (0. F. Muller, 1785) (cf. Frey, 1980), and Eurycercus (cf. Frey, 1975, 1978; Hann, unpubl.) have demonstrated that the distribution of several species is quite cir- cumscribed and confined to specific geographic regions. In recognition of this, it is essential to define, as far as possible, each taxon in the genus currently in the literature, enabling delimitation of closely similar taxa as they are encountered in North America. The species Alonella pulchella, first described by Herrick in 1884 from Minnesota, has not been reported in the literature since that time. Because the original description is lacking in many critical taxonomic features, and the species is
Crustaceana – Brill
Published: Jan 1, 1981
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