115
Euphausiacea
colorless species devour prey larger than themselves. Other colorless species
take only dissolved substances or are endoparasites in copepod eggs.
Photosynthetic euglenoid flagellates are found in estuarine environments
and on coastal mudflats. Formerly classified as an order of the subphylum
Mastigophora (phylum Sarcomastigophora, ~Protozoa).
Euglenophyceae ~Euglen i da .
eukaryotes all organisms, except viruses, bacteria and blue-green algae
(~prokaryotes) . They have a distinct nuclear membrane surrounding the
nucleus with the chromosomes.
Eulerian representation representation of the motion of a fluid by noting the flow
at different points in the current field. Current meters at fixed positions give
an Eulerian representation. ~Euler-Lagrange transformation.
Euler-Lagrange transformation the velocity distribution in a fluid can be represented in two different ways: by following the fluid elements and noting
their velocity and acceleration at any time and place (Lagrangian representation), and by giving the flow in different points of the current field and its
development in time as local accelerations (Eulerian representation) . In principle, the transformation from one data set to the other is only exact if the
current were known at any time and location. The problem of the EulerLagrange transformation is posed by the practical situation that this condition is never completely realized. These two representations are named
after the respectively German and French mathematicians L. Euler
(1707-1783) and L. Lagrange (1736-1813), who contributed to the hydrodynamic theory.
eulittoral zone ~zonation .
euneuston ~neuston .
eupelagic sediments ~deep-sea sediments.
Euphausiacea (euphausiids) order of the class Malacostraca (subphylum Crustacea,
phylum Arthropoda). Small to medium sized (up to 15 cm) pelagic shrimp-like
animals. They occur in all the oceans in almost all regions. They differ from
the decapodal (~Decapoda) shrimps by having no maxillipeds, and the biramous legs never have nippers. Most are filter feeders, filtering water through
long fringes on the appendages. They have an ocean-wide distribution, and
can form enormous swarms, which provide the major part of the food of
baleen whales and some fish. The most highly differentiated genus is
Euphausia (krill) with 30 species. (Figure see p. 116)
Euphausiacea
colorless species devour prey larger than themselves. Other colorless species
take only dissolved substances or are endoparasites in copepod eggs.
Photosynthetic euglenoid flagellates are found in estuarine environments
and on coastal mudflats. Formerly classified as an order of the subphylum
Mastigophora (phylum Sarcomastigophora, ~Protozoa).
Euglenophyceae ~Euglen i da .
eukaryotes all organisms, except viruses, bacteria and blue-green algae
(~prokaryotes) . They have a distinct nuclear membrane surrounding the
nucleus with the chromosomes.
Eulerian representation representation of the motion of a fluid by noting the flow
at different points in the current field. Current meters at fixed positions give
an Eulerian representation. ~Euler-Lagrange transformation.
Euler-Lagrange transformation the velocity distribution in a fluid can be represented in two different ways: by following the fluid elements and noting
their velocity and acceleration at any time and place (Lagrangian representation), and by giving the flow in different points of the current field and its
development in time as local accelerations (Eulerian representation) . In principle, the transformation from one data set to the other is only exact if the
current were known at any time and location. The problem of the EulerLagrange transformation is posed by the practical situation that this condition is never completely realized. These two representations are named
after the respectively German and French mathematicians L. Euler
(1707-1783) and L. Lagrange (1736-1813), who contributed to the hydrodynamic theory.
eulittoral zone ~zonation .
euneuston ~neuston .
eupelagic sediments ~deep-sea sediments.
Euphausiacea (euphausiids) order of the class Malacostraca (subphylum Crustacea,
phylum Arthropoda). Small to medium sized (up to 15 cm) pelagic shrimp-like
animals. They occur in all the oceans in almost all regions. They differ from
the decapodal (~Decapoda) shrimps by having no maxillipeds, and the biramous legs never have nippers. Most are filter feeders, filtering water through
long fringes on the appendages. They have an ocean-wide distribution, and
can form enormous swarms, which provide the major part of the food of
baleen whales and some fish. The most highly differentiated genus is
Euphausia (krill) with 30 species. (Figure see p. 116)