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Transcript of Planktonic Crustacean
term used to refer to small crustaceans. The taxonomic classification of these
organisms is actually quite
different for each one They all share the same kingdom, They also share a common phylum, But then they split into three
different classes. Copepoda is actually
a subclass and Cladocera is an order There have been more than 65,000 of Ostracods but only 13,000 are still alive today. Originally Ostracods were only Marine(saltwater), the majority still are, but there are at least 420 species of freshwater species and even terrestrial ones that lives in the humid forest soils. Freshwater Ostracods can live in lakes, ponds, streams, caves, Bromeliads (which, in case you didn't know, is a type of flower in the rainforest that is habitat for many species)and more This is a Bromeliad, not an Ostracod,
water collects in them There are at least 13,000 known species of Copepods, and 2,800 of them live in freshwater Copepods fall into three orders: Cyclopoidea, Calanoidea, and Harpacticoidea. Copepods can occupy most aquatic environments Cyclopoid Calanoid Harpacticoid Cladocera, commonly called water fleas, are completely different than Ostracods and Copepods because they are extremely rare in the oceans and only around 620 species have been recognized so far. This is the largest species of Cladocera,
it is freshwater Habitats Locomotion All three move by beating their antenna (or other appendages depending on the species) This makes them move in a jumpy motion These are two different types on antennae an Ostracod can have Gas exchange Cladocerans Ostracods Copepods It is still unknown how exactly Cladocerans preform gas exchange, some say it's gills, others say it's straight through their skin(Osmosis)
It is known (through experiments with oxygen sensitive dye) That the structures for specialized gas exchange are located within the filter chamber Like Cladocerans,
there is also the possibility that they preform osmosis. Copepods have no special organs for gas
exchange, all gas exchange is done by osmosis through the skin. Works Cited http://en.wikipedia.org/wiki/Cladocera
http://www.micrographia.com/specbiol/crustac/ostraco/ostr0100.htm Feeding Copepods, as you know, can be divided into three orders, Cyclopoids and Calanoids are omnivorous, feeding on smaller plankton as well as algae, and Harpacticoids are usually found foriging on submerged plants. Ostracods scuttle across submerged plants with their
shell opened allowing plants and small plankton to be scooped into their mouth part. Cladocerans also eat small planktonic organisms and green algae, they are not parasitic like you'd expect with the nick name "Water fles." Reproduction Cladocerans and Ostracods can reproduce both sexually and asexually. They and hermaphrodites, meaning they are both genders, an "female" can fertilize it's own eggs, but in times of stress they can drop the egss and allow other Cladocerans or Ostracods to fertilize them outside the body and be spread throughout the water. Copepods are not hermaphrodites, though they can reproduce asexually in the sam way as the other two planktonic crustaceans. There is a male which is slightly smaller than the female, and fertilization occurs within the body. There are at least 13,000 known species of Copepods, and 2,800 of them live in freshwater Diagrams