Brief Summary

Amphionides reynaudii is the only species in this Order, and is a small (less than one inch long) planktonic crustacean found throughout the world's tropical oceans, the larvae mostly in shallow waters, and the adults at greater depth.

Morphologically, Amphionides is somewhat unusual, with many body parts being reduced or absent. For example, it has only one pair of mouthparts – the maxillae – the mandibles and maxillules being vestigial.[1]

Males and females differ in the form of the antennae, and also by the presence in males of the eighth thoracic appendage, albeit in a reduced form. This is the site of the male gonopore (the female's gonopore is on the sixth thoracic appendage).[1] The first pleopod of the female is greatly enlarged and almost encloses the enlarged carapace. This is assumed to be a chamber in which the eggs are fertilised and retained until hatching.[1] The more streamlined carapace and pleopods of the male make it more hydrodynamic, and so fewer males are caught than females.

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

© Wikipedia

Supplier: Jennifer Hammock


Article rating from 0 people

Default rating: 2.5 of 5


EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!