Cystisoma is a genus of amphipod. It is the only member of the family Cystisomatidae within the Hyperiidea.
Description
Gallery
Cystisoma are characterized by unpigmented, transparent bodies which render them essentially invisible in water unless under precisely angled lighting.
Only their eyes are pigmented. There is only a single pair of eyes which are large and directed upwards, being spread into a thin sheet on the upper surface of the head. This is likely an adaption of life in the ocean depths, where the only major light source is from above.
Marine biologists at Duke University and the Smithsonian analyzed the crustacean's shell and discovered that it was covered in microscopic spheres that significantly reduce reflected light, thus giving the organism an antireflective coating. The spheres are believed to be bacteria due to their morphology and method of reproduction. Minute structures called nanoprotuberances were also observed on the Cystisoma's body, notably on the organism's legs. Researchers believe that they act as a buffer between light and the Amphipoda body, significantly reducing surface reflection.
Size
Cystisoma are the largest of
Hyperiidea, reaching lengths over 100 mm.
Distribution
Cystisoma inhabit the dim
Photic zone and
Mesopelagic zone zones. They can be found in all of the world's oceans. They appear to be freely swimming organisms and unlike other hyperiids, do not appear to be closely associated with
.
Species
-
Cystisoma fabricii Stebbing, 1888
-
Cystisoma gershwinae Zeidler, 2003
-
Cystisoma latipes (Stephensen, 1918)
-
Cystisoma longipes (Bovallius, 1886)
-
Cystisoma magna (Woltereck, 1903)
-
Cystisoma pellucida (Willemöes-Suhm, 1873)
External links
