Calanoida

Calanoida is an order of copepods, a group of arthropods commonly found as zooplankton. The order includes around 46 families with about 1800 species of both marine and freshwater copepods between them.[2] Calanoid copepods are the dominant animals in the plankton in many parts of the world's oceans, making up 55%–95% of plankton samples.[2] They are therefore important in many food webs, taking in energy from phytoplankton and algae and 'repackaging' it for consumption by higher trophic level predators.[2] Many commercial fish are dependent on calanoid copepods for diet in either their larval or adult forms. Baleen whales such as bowhead whales, sei whales, right whales and fin whales rely substantially on calanoid copepods as a food source.[2]

Calanoida
Diaptomus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Hexanauplia
Superorder: Gymnoplea
Giesbrecht, 1882 [1]
Order: Calanoida
Sars, 1903
Families

See text

Calanoids can be distinguished from other planktonic copepods by having first antennae at least half the length of the body and biramous second antennae.[2] However, their most distinctive anatomical trait is the presence of a joint between the fifth and sixth body segments.[3] The largest specimens reach 18 millimetres (0.71 in) long, but most do not exceed 0.5–2.0 mm (0.02–0.08 in) long.[2]

Classification

Calanoida contains the following families, as well as the genus Microdisseta (which is currently incertae sedis);

gollark: My theory of what's up, copied from the forum thread:If many new eggs are being introduced to the system, then that will most affect the stuff which is rarest, by making it rarer by comparison, but commons will stay the same. As for why it happened now? Weekly updates, possibly.Example:Imagine there are 200 dragons, 5 of which are golds.The ratio of golds to total dragons is now 5:200 = 1:40. If the target ratio is 1:50 then prices will be higher to compensate.Now imagine there are an extra 200 dragons added, none of which are golds.The ratio would then be 5:400 = 1:80. Then, assuming the same target, prices will drop.This is of course simplified, and the ratios may not work like this, but this matches observed behavior pretty well.
gollark: That why was rhetorical.
gollark: As I said on the forums:```That makes sense. If many new eggs are being introduced to the system, then that will most affect the stuff which is rarest, by making it rarer by comparison, but commons will stay the same. As for why it happened now? Weekly updates, possibly.```
gollark: Why?
gollark: I think it's just halloween.

References
  1. J. W. Martin & G. E. Davis (2001). An Updated Classification of the Recent Crustacea (PDF). Natural History Museum of Los Angeles County. Archived from the original (PDF) on 8 September 2019.
  2. Mauchline, John (1998). "Introduction". The Biology of Calanoid Copepods. Advances in Marine Biology. 33. Elsevier. pp. 1–15. ISBN 978-0-12-105545-5.
  3. Barnes, Robert D. (1982). Invertebrate Zoology. Philadelphia, Pennsylvania: Holt-Saunders International. p. 692. ISBN 0-03-056747-5.


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