- Cooper of the sea
taxobox
name=Cooper of the sea
status=LC
regnum=Animal ia
phylum=Arthropod a
subphylum=Crustacea
classis=Malacostraca
ordo=Amphipoda
subordo=Hyperiidea
infraordo=Physocephalata
familia=Hyperiidae
genus="Phronima
species="P. sedentaria"
binomial="Phronima sedentaria"
binomial_authority=Forsskål, 1775The cooper of the sea is a species of amphipod
crustacean found in oceans at a depth of up to 1 km.Characteristics
Females are 14 mm in length, males are 15 mm in length. Males have an elongated basis of the first antenna. The eyes make up nearly a quarter of the body, giving rise to the
infraorder name Physocephalata, meaning "large head". Each of the two eyes is divided into a medial and lateral eye.Ecology
These crustaceans are usually found in midwater pelagic habitats, but can be found migrating all the way to the surface. Females live in the barrel-like bodies of
salp s, and use their strong pleopods to propel their homes through the water. The amphipod can somersault quickly in the barrel and thus change directions. "Phronima sedentaria" is carnivorous onzooplankton ,krill , andarrowworm s.References
Grzimek's Animal Life Encyclopedia . Volume 2 — Protostomes.External links
* [http://www.biology.duke.edu/johnsenlab/gallery/phronima.html A cooper in its salp] .
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