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XXVII.—On some Pseudo-hermaphrodite Examples of Daphnia pulex
Published online by Cambridge University Press: 15 September 2014
Extract
Among about a hundred specimens of Daphnia pulex (De Geer) obtained for class purposes, at the end of May, 1912, I found two females in each of which the antennule of one side resembled that of a male. These cases seem worthy of notice in view of the paucity of existing records of similar abnormalities in Daphnia.
Previous Records of Abnormalities of the Antennules in Cladocera.
Kurz found, in October, 1873, an example of D. pulex in which the right antennule was short, as in the female, while the left approached in form that of the male, though it was not quite as large as the latter.
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page 307 note * The entire collection was carefully examined; males were not present.
page 307 note † “Über androgyne Missbildung bei Cladoceren,” Sitzb. K. Akad. Wiss. Wien, Math.-naturw. Klasse, Bd. lxix., i Abt. (1874), pp. 40–46.
page 308 note * “Über Hermaphroditismus bei Cladoceren,” Kosmos, Bd. xxi. (1896), pp. 301–310. Abstract in Zool. Centralbl., iv Jahrg. (1897), p. 414.
page 308 note † “Über natürliche und künetliche Varietätenbildung bei Daphniden,” Verhandl. D. Zool. Ges., 1908, p. 239.
page 308 note ‡ “Unters, über Fortpflanzungsverhältnisse u. Vererbung bei Cladoceren,” Internat. Revue Hydrobiol., Bd. ii. (1909), pp. 658–667.
page 308 note § Except that, judging from the figure (op. cit., fig. 1), a seta was not present on the anterior margin of the antennule.
page 311 note * Females, bearing young in the brood-pouch, and collected in the same locality early in June, were found to range in length from 1·9 to 2·5 mm., and most of them were 2·2 to 2·5 mm. long; the average length of ten specimens, taken at random, was 2·3 mm., and the average of their maximum depths 1·4 mm. The average dimensions of six males of the same species were—length, 1·45 mm.; depth, 8 mm.
page 314 note * Lilljeborg, W., “Cladocera Sueoiæ,” Nova Acta R. Soc. Sci. Upsala, Ser. 3, vol. xix. (1900). See pl. xxviii, figs. 25, 26.Google Scholar
page 315 note * The only other departure from the normal mode of growth was in regard to the antero-ventral edge of the right valve of the carapace in specimen II., which presented almost the configuration of that of a male (see p. 313).
page 315 note † The young of the first specimen (I. ) had been for a considerable time under a cover-glass, in a limited amount of water, before the abnormality of their parent was noticed, and, unfortunately, they proved to be no longer viable.