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The beating heart of Daphnia under the microscope. The body of a Daphnia species is usually 1–5 mm (0.039–0.197 in) long, [2] and is divided into segments, although this division is not visible. [3] The head is fused, and is generally bent down towards the body with a visible notch separating the two.
Daphnia lumholtzi is a small crustacean that is 2–3 mm in length. [4] It has a large helmet and a long tailspine, usually longer than the length of its body, [3] that fluctuates in size. [2] [5] Its body structure is arched, extending to a sharp point. [3] There are roughly 10 prominent spines on the margin of the abdominal shield covering. [3]
Daphnia_Heartbeat.ogv (Ogg Theora video file, length 45 s, 640 × 480 pixels, 593 kbps, file size: 3.22 MB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
Daphnia have a compound eye, and they are known to have an optomotor response. [12] D. pulicaria generally have a body length less than 3mm. [3] Because of the clear carapace of Daphnia, it is possible to see the heart and digestive tract, which often appears to be green due to the consumption of algae. [11]
Daphnia magna is a typical water flea of the genus Daphnia. The females reach up to 5 mm in size, the males about 2 mm, thus they are among the largest species in the genus. [2] The body is protected by a translucent carapace made of chitin, a transparent polysaccharide. [3]
Daphnia pulex. The genus Daphnia (Crustacea: Cladocera: Daphniidae) contains over 200 species of water fleas, many of which are in need of further taxonomic investigation (species inquirendae; marked with asterisks). [1]
This difference in temperatures can be observed in different seasons and can lead to a high amount of variability between Daphnia, a crucial part of its ability to coevolve with P. ramosa. During P. ramosa infection, the size of the Daphnia increases significantly. This phenomenon is known as pathogen-induced gigantism. In addition, the ...
Like all Daphnia species, D. longispina is a filter feeder, collecting particles of about 2 to 40 μm suspended in the water. [5] The main food are green algae. At 20 °C maturity is reached within about 6 to 12 days, followed by a period of regular reproduction in about 3-4 day intervals.