LM of Daphnia pulex with eggs in the brood chamber

LM of Daphnia pulex with eggs in the brood chamber

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Credit: J.C. REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: Light micrograph of a female fresh waterflea Daphnia pulex, showing eggs developing in the dorsal surface of the carapace. The first pair of antennae are small, the large second pair, which are branched, bear several long swimming hairs. The second antennae serve as "rowing organs" propelling the creature through the water in jerky movements. During the spring & through the summer only females are found in the water. They reproduce parthenogenetically. Later small males appear & normal reproduction follows. The resulting eggs overwinter in the female & are laid in early spring. Waterfleas feed on algae. Magnification: x2 at 35mm size.

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Keywords: animal, crustacean, daphnia pulex, invertebrate, invertebrates, light micrograph, nature, parthenogenesis, parthenogensis, waterflea, wildlife, zoology

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