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Daphnia magna
Daphnia magna

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Daphnia spp., water flea

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Taxonomy

cellular organisms - Eukaryota - Fungi/Metazoa group - Metazoa - Eumetazoa - Bilateria - Coelomata - Protostomia - Panarthropoda - Arthropoda - Mandibulata - Pancrustacea - Crustacea - Branchiopoda - Phyllopoda - Diplostraca - Cladocera - Anomopoda - Daphniidae - Daphnia -

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Daphnia taxonomy explained

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Daphnia magna culture

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Brief facts

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Daphnia magna under magnifying glass

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Modes of reproduction

Daphnia exhibit heterogonic reproduction by alternating asexual (parthenogenic) and sexual stages. Cyclical partenogenesis seems to combine the best aspects of the two modes of reproduction.

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Two Daphnia magna.

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Partenogenetic developmental stages

Youtube: Daphnia magna video (06/15/10): mixed developmental stages in near natural habitat

Youtube (embedded below): Daphnia magna video (06/17/10): more dense population, growth of microalgae is supported by broad spectrum lamp

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Daphnia sexes

Olmstead AW et al. The Environmental-Endocrine Basis of Gynandromorphism (Intersex) in a Crustacean Int J Biol Sci. 2007; 3(2): 77–84.

Female (panel A), male (panel B), and gynandromorphic (panel C) D. magna. Differentiating sex characteristics include the pair of minute first antennae (FA) of the females, the elongated FA of the males. Gynandromorphic individuals possessed an elongated FA partnered with a diminutive antenna. The female-like diminutive FA is obscured by the male-like elongated FA in the micrograph. The bivalved-like carapace of the female has two uniform, symmetrical edges (CE). Both CEs of the male are asymmetrical and are edged by setae. The gynandromorphic daphnid has one female-like symmetrical CE and one male-like asymmetrical CE.

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References