''Neis'' is a genus of nudan ctenophores. It is a monotypic genus containing the single species ''Neis cordigera''. It occurs only near Australia. As all beroids, it is a free-swimmer that form part of the

plankton Plankton are the diverse collection of organisms found in Hydrosphere, water (or atmosphere, air) that are unable to propel themselves against a Ocean current, current (or wind). The individual organisms constituting plankton are called plankt ...

. ''Neis cordigera'' is among the largest species in the class, often exceeding in length. It is somewhat flattened and characterized by a pair of trailing gelatinous "wings" that extend beyond the aboral tip. Like other comb jellies, the body wall of nudans consists of an outer

epidermis The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and hypodermis. The epidermis layer provides a barrier to infection from environmental pathogens and regulates the amount of water rele ...

and an inner gastrodermis, separated by a jelly-like

mesoglea Mesoglea refers to the extracellular matrix found in cnidarians like coral or jellyfish that functions as a hydrostatic skeleton. It is related to but distinct from mesohyl, which generally refers to extracellular material found in sponges. Desc ...

. The mesoglea has pigments that give many nudan species a slightly pink color; ''Neis cordigera'' may be yellowish or a deep orange-red. The aboral end is extended into two large lobes and the vascular system is undivided.

References

Nuda Monotypic ctenophore genera Taxa named by René Lesson {{Ctenophore-stub