New Species of Apus from California

Contributions to the Morphology and the Taxonomy of the Branchiopoda Notostraca, with Special Reference to the North American Species

“…These females were taken from a population where no males were observed. Bisexual populations of the same species are also common (Gaschott, 1928 A. oryzaphagus and A. biggsi (Rosenberg, 1947) In the Conchostraca we may expect something of this kind.…”

“…For a species the formula is more complicated because there is a considerable variation of these numbers within the limits of a species (Linder, 1947). If the abdominal leg-bearing rings number from 16 to 18.5, the legless rings from 5 to 10, and the total from 35 to 38 rings, the formula would be, 11 + (16-18.5) + (5)(6)(7)(8)(9)(10) As Barnard (1929) and S0mme (1934) Rosenberg (1947) (Linder, 1941, p. 113 (Linder, 1947 Packard (1883) mentions the figures for one specimen of Apus lucasanus and Rosenberg (1947) Chamberlin and Duncan (1924, p. 99 Rosenberg's (1947) Usually, the females have more, sometimes many more, leg-bearing abdominal rings than the males of the same species.…”

Evolution in the Notostraca

“…Triops lonqicaudatus in North America is bisexual over most of its range, hut in the Californian rice-fields no males occur (Rosenberg. 1947) and all the individuals present appear to be hermaphrodites (Longhurst.…”